manual edition 10/2004 - siemens · manual edition 10/2004 molded-case circuit-breakers. important...

Manual Edition 10/2004

Molded-case circuit-breakers

Important Information,

Contents

System Overview 1

Mounting 2

Connections 3

Construction and Operating Principle of

the Circuit-breaker4

Application 5

Circuit Diagrams 6

Selectivity 7

Maintenance Instructions 8

Troubleshooting 9

Edition: 10/2004

System

SENTRON VL

Manual

GWA 4NEB 110 0110-02

Safety information

This manual contains information which must be observed for your personal safety and to prevent damages occurring. The information is indicated by a warning triangle. The different degrees of danger are listed below:

Safety informationis important information which is relevant for the acceptance test of this product and its safe installation.

Dangermeans that death, severe personal injury or physical damage will occur if the specified warnings are not followed.

Warningmeans that death, severe personal injury or physical damage could occur if the specified warnings are not followed.

Cautionmeans that slight personal injury or physical damage could occur if the specified warnings are not followed.

Cautionmeans that physical damage could occur if the specified warnings are not followed.

Attentionis important information about the product, the operation of the product or a part of the documentation to which particular attention should be paid.

Qualified personnel

The commissioning and usage of the device may only be carried out by qualified personnel. Qualified personnel in the sense of the safety information in this manual are defined as people who have permission to commission, ground and label devices, systems and circuits according to the safety standards.

Usage in compliance with specifications

Consider the following:

WarningThe device may only be used for the applications specified in the catalog and technical documentation and only in connection with foreign devices recommended or permitted by Siemens.

The proper and safe operation of the product requires appropriate transport, storage, installation and mounting as well as careful commissioning and operation.

Trademarks

All the designations marked with the copyright symbol ® are registered trademarks of Siemens AG. The remaining designations in this document may be copyrighted, and their proprietary use may infringe on the rights of the owners.

Siemens AGAutomation and Drives DepartmentLow-Voltage Controls and Distribution division90327 Nuremberg, Germany

Siemens AG

© Siemens AG 2004Subject to change without prior notice.

Copyright Siemens AG 2004 All rights reserved

The transfer or reproduction of this documentation, exploitation or communication of its contents is forbidden unless expressly permitted. Violations will lead to compensation being sought for damages. All rights reserved, particularly where patents or utility patents have been granted.

Exclusion of liability

We have checked the contents of this manual with the hardware andsoftware described. However, variations cannot be excluded and assuch we do not take any responsibility for complete conformity. Theinformation in this manual is checked regularly, and requiredcorrections will be contained in the following editions. We aregrateful for suggestions about improvements.

Technical Assistance: Telephone: +49 (0) 911-895-5900 (8°° - 17°° CET) Fax: +49 (0) 911-895-5907E-mail: [email protected]: www.siemens.com/lowvoltage/technical-assistance

Technical Support: Telephone: +49 (0) 180 50 50 222

Contents

1 SENTRON VL System Overview . . . . . . . . . . . . . . . . . . . 1-1

1.1 Service conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21.2 Application overview . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21.3 SENTRON VL overview. . . . . . . . . . . . . . . . . . . . . . . . . 1-31.4 Switching capacity overview . . . . . . . . . . . . . . . . . . . . . . 1-41.5 Technical overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51.6 Standards and specifications . . . . . . . . . . . . . . . . . . . . . . 1-71.7 Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . . 1-81.8 Application conditions . . . . . . . . . . . . . . . . . . . . . . . . . 1-91.8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-91.8.2 Shock resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-91.8.3 Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-91.9 Derating factors at high altitudes . . . . . . . . . . . . . . . . . . . . 1-91.10 Derating factors for special environmental conditions . . . . . . . . . 1-101.10.1 Thermomagnetic overcurrent release. . . . . . . . . . . . . . . . . . 1-101.10.2 Thermomagnetic overcurrent release + RCD module . . . . . . . . . . 1-121.10.3 Electronic overcurrent release . . . . . . . . . . . . . . . . . . . . . 1-131.10.4 Thermomagnetic overcurrent release. . . . . . . . . . . . . . . . . . 1-141.11 Application in networks with different frequencies . . . . . . . . . . . 1-141.11.1 Influence of network frequency and harmonics on the operation of

switching devices . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-141.11.2 Thermal rating of the system components and conductor depending

on the network frequency . . . . . . . . . . . . . . . . . . . . . . . 1-141.11.3 Current carrying capacity of circuit-breakers . . . . . . . . . . . . . . 1-151.11.4 Usage in 16 2/3 Hz networks . . . . . . . . . . . . . . . . . . . . . . 1-151.11.5 Usage in 50/60 Hz networks . . . . . . . . . . . . . . . . . . . . . . 1-151.11.6 Circuit-breakers for 400 Hz applications . . . . . . . . . . . . . . . . 1-151.12 Influence of temperature and humidity on overcurrent release . . . . . 1-161.12.1 Thermomagnetic overcurrent release TM. . . . . . . . . . . . . . . . 1-161.12.2 Electronic overcurrent release ETU . . . . . . . . . . . . . . . . . . . 1-161.12.3 Electronic overcurrent release LCD - ETU . . . . . . . . . . . . . . . 1-161.13 Heat loss for fixed mounted circuit-breakers . . . . . . . . . . . . . . 1-171.13.1 Heat loss for thermomagnetic overcurrent releases (TM). . . . . . . . 1-171.13.2 Heat loss for electrical overcurrent releases (ETU/LCD ETU) . . . . . . 1-181.14 Circuit-breakers with differential current protection – RCD module . . . 1-181.15 Overcurrent release system overview . . . . . . . . . . . . . . . . . 1-231.15.1 Thermomagnetic overcurrent release TM VL160X . . . . . . . . . . . 1-241.15.2 Thermomagnetic overcurrent release TM VL160-VL630 . . . . . . . . 1-241.15.3 Electronic overcurrent release ETU VL160-VL1600 . . . . . . . . . . . 1-241.15.4 Electronic overcurrent release LCD ETU . . . . . . . . . . . . . . . . 1-261.15.5 Menu structure of the electronic trip unit LCD ETU . . . . . . . . . . 1-281.15.7 Overcurrent release system - functions overview . . . . . . . . . . . 1-321.16 Ground fault protection . . . . . . . . . . . . . . . . . . . . . . . . . 1-331.16.1 Measurement method 1: Vectorial summation . . . . . . . . . . . . . 1-33

SENTRON VL System ManualGWA 4NEB 110 0110-02 iii

1.17 Rating plate and identification number . . . . . . . . . . . . . . . . . 1-34

2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.2 Fixed mounted versions . . . . . . . . . . . . . . . . . . . . . . . . 2-22.3 Plug-in versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32.4 Withdrawable versions . . . . . . . . . . . . . . . . . . . . . . . . . 2-32.5 Mounting and safety clearances . . . . . . . . . . . . . . . . . . . . 2-42.5.1 Mounting/installation . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.6.1 Rated operational voltage: Ue ≤ 600 V AC/500 V DC . . . . . . . . . . 2-9

3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.1 Main conductor connection of the SENTRON VL fixed mounted version 3-23.1.1 Network connection . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23.1.2 Multiple feed-in terminal for cable (copper/aluminum) . . . . . . . . . 3-23.1.3 Box terminals (copper cables or bars) . . . . . . . . . . . . . . . . . 3-33.1.4 Front connecting bars . . . . . . . . . . . . . . . . . . . . . . . . . 3-33.1.5 Front flared busbar extensions . . . . . . . . . . . . . . . . . . . . . 3-43.1.6 Rear terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43.1.7 Rear flat busbar terminals . . . . . . . . . . . . . . . . . . . . . . . 3-53.1.8 Connection with screw-type terminals . . . . . . . . . . . . . . . . . 3-63.1.9 Connection with cable lugs . . . . . . . . . . . . . . . . . . . . . . . 3-63.2 Main conductor connection for plug-in and withdrawable versions . . . 3-73.2.1 Plug-in socket: Connection on the front with busbar extensions . . . . 3-73.2.2 Plug-in socket: Connection on the back with flat busbar terminals . . . 3-73.2.3 Withdrawable version: Connection on the front with busbar extensions 3-83.2.4 Withdrawable version: Connection on the back with flat busbar terminals 3-83.3 Location and position of the terminals . . . . . . . . . . . . . . . . . 3-93.3.1 Description of the terminals . . . . . . . . . . . . . . . . . . . . . . 3-103.4 Conversion tables . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-113.4.1 Metric/US-American cross sections . . . . . . . . . . . . . . . . . . 3-113.4.2 Other conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

4 Design and Operating Principle of the Circuit-breakers . . . . . . . 4-1

4.1 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24.2 Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44.2.1 Toggle handle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44.2.2 Rotary mechanism on the front. . . . . . . . . . . . . . . . . . . . . 4-54.2.3 Door-coupling rotary operating mechanism . . . . . . . . . . . . . . . 4-54.3 Leading auxiliary switch for switching on/off . . . . . . . . . . . . . . 4-74.3.1 Leading auxiliary switch for switching from OFF to ON (leading NO contact) 4-74.3.2 Leading auxiliary switch for switching off (leading NC contact) . . . . . 4-74.3.3 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84.4 Locking devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84.4.1 Locking device for the toggle handle . . . . . . . . . . . . . . . . . . 4-84.4.2 Safety lock for the rotary operating mechanism and the motorized

operating mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

SENTRON VL System Manualiv GWA 4NEB 110 0110-02

4.4.3 Mutual interlocking of two circuit-breakers (bowden wire) in the fixed mounted, plug-in and withdrawable versions. . . . . . . . . . . . . . 4-9

4.4.4 Mutual interlocking (rear interlocking modules) of two circuit-breakers in the fixed mounted, plug-in and withdrawable versions. . . . . . . . 4-12

4.5 Stored energy operator . . . . . . . . . . . . . . . . . . . . . . . . . 4-134.5.1 Technical data: Stored energy operator . . . . . . . . . . . . . . . . . 4-164.6 Undervoltage release. . . . . . . . . . . . . . . . . . . . . . . . . . 4-174.6.1 Technical data: Undervoltage release . . . . . . . . . . . . . . . . . . 4-174.7 Shunt release. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-184.7.1 Technical data: Shunt release . . . . . . . . . . . . . . . . . . . . . . 4-184.8 Auxiliary and alarm switches . . . . . . . . . . . . . . . . . . . . . . 4-194.8.1 Technical data: Auxiliary switch . . . . . . . . . . . . . . . . . . . . . 4-204.9 Cover frames for door cutouts . . . . . . . . . . . . . . . . . . . . . 4-214.10 Terminal covers/phase barriers . . . . . . . . . . . . . . . . . . . . . 4-224.11 Phase barriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-224.12 Toggle handle extension . . . . . . . . . . . . . . . . . . . . . . . . 4-234.13 Further accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-234.13.1 Position signaling switch . . . . . . . . . . . . . . . . . . . . . . . . 4-234.13.2 Auxiliary conductor connection system . . . . . . . . . . . . . . . . . 4-244.13.3 Locking options for the guide frame . . . . . . . . . . . . . . . . . . 4-254.13.4 Guide frame crank handle . . . . . . . . . . . . . . . . . . . . . . . 4-254.13.5 Trip-to-test button . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-264.13.6 Portable tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

5 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.1 Combination including frequency converter and SENTRON VL circuit-breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

5.1.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25.1.2 SIRIUS soft starters and SENTRON VL circuit-breakers. . . . . . . . . 5-25.1.3 Frequency converters/variable speed drives and SENTRON VL

circuit-breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25.2 Circuit-breakers for capacitor banks . . . . . . . . . . . . . . . . . . 5-35.3 Using the SENTRON VL circuit-breaker in DC networks . . . . . . . . 5-55.4 Circuit-breakers for motor protection . . . . . . . . . . . . . . . . . . 5-75.4.1 Operating principle of the overcurrent release . . . . . . . . . . . . . 5-75.4.2 Thermal memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-85.4.3 Circuit-breaker for motor protection with fixed release class ETU 10M . 5-105.4.4 Circuit-breaker for motor protection with adjustable release class

ETU 30M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-115.4.5 Circuit-breaker for motor protection with adjustable release class

ETU 40M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

6 Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

7 Selectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.1 Current selectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27.2 Time selectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37.3 Downloading the selectivity tables . . . . . . . . . . . . . . . . . . . 7-3

SENTRON VL System ManualGWA 4NEB 110 0110-02 v

7.4 Information about the calculated selectivity limits . . . . . . . . . . . 7-4

8 Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . 8-1

8.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-28.2 Functionality test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

9.1 Information for troubleshooting. . . . . . . . . . . . . . . . . . . . . 9-2

SENTRON VL System Manualvi GWA 4NEB 110 0110-02

Figures

Figure 1-1: SENTRON VL overview . . . . . . . . . . . . . . . . . . . . . . . . 1-3Figure 1-2: Thermal / magnetic TM . . . . . . . . . . . . . . . . . . . . . . . . . 1-16Figure 1-3: Standard ETU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16Figure 1-4: ETU/LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16Figure 1-5: VL160X with RCD module . . . . . . . . . . . . . . . . . . . . . . . 1-21Figure 1-6: VL160X with RCD module . . . . . . . . . . . . . . . . . . . . . . . 1-21Figure 1-7: VL160X with RCD module . . . . . . . . . . . . . . . . . . . . . . . 1-21Figure 1-8: Left-side mounting for VL160X with RCD module . . . . . . . . . . . 1-21Figure 1-9: RCD module for VL160 . . . . . . . . . . . . . . . . . . . . . . . . . 1-21Figure 1-10:Menu of the LCD display of the overcurrent release . . . . . . . . . . 1-27Figure 1-11:Detail of the menu for the overcurrent release LCD ETU 40 . . . . . . 1-28Figure 1-12:Example: Changing the type of protection of the overcurrent release

LCD ETU 40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29Figure 1-13:Detail of the menu for the overcurrent release LCD ETU 40 M . . . . 1-30Figure 1-14:Example: Changing the type of protection of the overcurrent release

LCD ETU 40 M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31Figure 1-15:Circuit-breaker in balanced system . . . . . . . . . . . . . . . . . . . 1-33Figure 1-16:3-pole circuit-breaker, current converter in neutral conductor current . 1-33Figure 1-17:4-pole circuit-breaker, current converter installed internally . . . . . . 1-33Figure 1-18:3-pole circuit-breaker, current transformer at the grounded star point

of the transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34Figure 1-19:Circuit-breaker – Labeling and control elements . . . . . . . . . . . . 1-34Figure 2-1: Connection on the front of the mounting plate . . . . . . . . . . . . . 2-2Figure 2-2: Connection on the back of the mounting plate . . . . . . . . . . . . . 2-2Figure 2-3: Connection on the front of the mounting rail . . . . . . . . . . . . . . 2-2Figure 2-4: Connection on the front . . . . . . . . . . . . . . . . . . . . . . . . 2-2Figure 2-5: Connection on the back . . . . . . . . . . . . . . . . . . . . . . . . 2-2Figure 2-6: Connection on the front of the mounting plate . . . . . . . . . . . . . 2-3Figure 2-7: Connection on the back of the mounting plate . . . . . . . . . . . . . 2-3Figure 2-8: Connection on the front of the mounting rails . . . . . . . . . . . . . 2-3Figure 2-9: Connection on the back of the mounting rails . . . . . . . . . . . . . 2-3Figure 2-10:Connection on the front of the withdrawable version . . . . . . . . . 2-3Figure 2-11:Connection on the back of the withdrawable version . . . . . . . . . 2-3Figure 2-12:Connected position . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Figure 2-13:Disconnected position . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Figure 2-14:Removable position . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Figure 2-15:Mounting/installation . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Figure 2-16:Safety clearances: . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Figure 2-17:Minimum clearance between two horizontally or vertically installed

circuit-breakers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6Figure 2-18:Minimum clearance between the circuit-breaker and metal . . . . . . 2-6

SENTRON VL System ManualGWA 4NEB 110 0110-02 vii

Figure 2-19:Table of different connection types . . . . . . . . . . . . . . . . . . 2-7Figure 2-20:Mounting using a cable connection . . . . . . . . . . . . . . . . . . 2-8Figure 2-21:Mounting using busbars . . . . . . . . . . . . . . . . . . . . . . . . 2-8Figure 3-1: Supply types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Figure 3-2: Multiple feed-in terminals . . . . . . . . . . . . . . . . . . . . . . . 3-2Figure 3-3: Multiple feed-in terminal application . . . . . . . . . . . . . . . . . . 3-2Figure 3-4: Box terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Figure 3-5: Box terminals with solid/flexible copper bars or cables . . . . . . . . 3-3Figure 3-6: Front connecting bars . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Figure 3-7: Application of front connecting bars . . . . . . . . . . . . . . . . . . 3-3Figure 3-8: Flared busbar extensions . . . . . . . . . . . . . . . . . . . . . . . . 3-4Figure 3-9: Application of flared busbar extensions . . . . . . . . . . . . . . . . 3-4Figure 3-10:Round terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Figure 3-11:Application of the round terminals . . . . . . . . . . . . . . . . . . . 3-4Figure 3-12:Flat busbar terminal . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5Figure 3-13:Application of flat busbar terminals . . . . . . . . . . . . . . . . . . . 3-5Figure 3-14:Connection with screw-type terminal . . . . . . . . . . . . . . . . . 3-6Figure 3-15:Establishing a connection with a screw-type terminal . . . . . . . . . 3-6Figure 3-16:Cable lug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6Figure 3-17:Application of cable lug no. 1 . . . . . . . . . . . . . . . . . . . . . . 3-6Figure 3-18:Application of cable lug no. 2 . . . . . . . . . . . . . . . . . . . . . . 3-6Figure 3-19:Application of cable lug no. 3 . . . . . . . . . . . . . . . . . . . . . . 3-6Figure 3-20:Plug-in socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Figure 3-21:Plug-in socket with front busbar extensions (busbar covers are

not shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Figure 3-22:Plug-in socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Figure 3-23:Plug-in socket with rear flat busbar terminals . . . . . . . . . . . . . 3-7Figure 3-24:Withdraw-able version with front busbar extensions and terminal covers 3-8Figure 3-25:Withdraw-able version with front busbar extensions . . . . . . . . . 3-8Figure 3-26:Withdraw-able version with rear flat busbar terminals . . . . . . . . . 3-8Figure 3-27:Withdraw-able version with rear flat busbar terminals . . . . . . . . . 3-8Figure 3-28:Location of the terminals . . . . . . . . . . . . . . . . . . . . . . . . 3-9Figure 3-29:Location of the terminals . . . . . . . . . . . . . . . . . . . . . . . . 3-9Figure 4-1: Internal view of MCCB . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Figure 4-2: Toggle handle in the “ON” position . . . . . . . . . . . . . . . . . . 4-4Figure 4-3: Toggle handle positions . . . . . . . . . . . . . . . . . . . . . . . . 4-4Figure 4-4: Rotary mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5Figure 4-5: Door-coupling rotary operating mechanism . . . . . . . . . . . . . . 4-5Figure 4-6: Rotary operating mechanism with leading auxiliary switches . . . . . 4-7Figure 4-7: Locking device for the toggle handle . . . . . . . . . . . . . . . . . . 4-8Figure 4-8: Rotary operating mechanism on the front . . . . . . . . . . . . . . . 4-9Figure 4-9: Stored energy operator for the VL250 . . . . . . . . . . . . . . . . . 4-9

SENTRON VL System Manualviii GWA 4NEB 110 0110-02

Figure 4-10:Stored energy operator with memory for the VL630 . . . . . . . . . . 4-9Figure 4-11:With toggle handle . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9Figure 4-12:With rotary operating mechanism . . . . . . . . . . . . . . . . . . . 4-9Figure 4-13:Possible mounting options . . . . . . . . . . . . . . . . . . . . . . . 4-10Figure 4-14:Fixed mounted version . . . . . . . . . . . . . . . . . . . . . . . . . 4-12Figure 4-15:Plug-in version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12Figure 4-16:Fixed mounted version . . . . . . . . . . . . . . . . . . . . . . . . . 4-12Figure 4-17:Plug-in version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12Figure 4-18:Stored energy operator . . . . . . . . . . . . . . . . . . . . . . . . . 4-13Figure 4-19:The stored energy operator is charged . . . . . . . . . . . . . . . . . 4-14Figure 4-20:Display: Discharged stored energy operator . . . . . . . . . . . . . . 4-14Figure 4-21:The stored energy operator is discharged . . . . . . . . . . . . . . . 4-14Figure 4-22:Display: Charged stored energy operator . . . . . . . . . . . . . . . 4-14Figure 4-23:The stored energy operator is discharged . . . . . . . . . . . . . . . 4-14Figure 4-24:Display: Charged stored energy operator . . . . . . . . . . . . . . . 4-14Figure 4-25:Stored energy operator . . . . . . . . . . . . . . . . . . . . . . . . . 4-15Figure 4-26:Local/remote change-over switch . . . . . . . . . . . . . . . . . . . 4-15Figure 4-27:Locking slide with padlock . . . . . . . . . . . . . . . . . . . . . . . 4-15Figure 4-28:Locking slide with padlock . . . . . . . . . . . . . . . . . . . . . . . 4-15Figure 4-29:Mechanical locking with safety lock . . . . . . . . . . . . . . . . . . 4-16Figure 4-30:Mechanical locking with safety lock . . . . . . . . . . . . . . . . . . 4-16Figure 4-31:Undervoltage release . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17Figure 4-32:Shunt release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18Figure 4-33:Cover frames for door cutouts . . . . . . . . . . . . . . . . . . . . . 4-21Figure 4-34:3VL9300-8BC00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21Figure 4-35:3VL9300-8BG00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21Figure 4-36:3VL9300-8BC00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21Figure 4-37:3VL9300-8BJ00/3VL9300-8BD00 . . . . . . . . . . . . . . . . . . . 4-21Figure 4-38:Standard terminal cover . . . . . . . . . . . . . . . . . . . . . . . . 4-22Figure 4-39:Extended terminal cover . . . . . . . . . . . . . . . . . . . . . . . . 4-22Figure 4-40:Phase barriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22Figure 4-41:Application of phase barriers . . . . . . . . . . . . . . . . . . . . . . 4-22Figure 4-42:Toggle handle extension . . . . . . . . . . . . . . . . . . . . . . . . 4-23Figure 4-43:Application of toggle handle extension . . . . . . . . . . . . . . . . . 4-23Figure 4-44:Position signaling switch . . . . . . . . . . . . . . . . . . . . . . . . 4-23Figure 4-45:Auxiliary conductor connection system . . . . . . . . . . . . . . . . 4-24Figure 4-46:Locking option for the guide frame device support: . . . . . . . . . . 4-25Figure 4-47:Guide frame crank handle . . . . . . . . . . . . . . . . . . . . . . . 4-25Figure 4-48:Trip-to-test button . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26Figure 4-49:Portable tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26Figure 5-1: Frequency converter . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2Figure 5-2: ETU with release classes 5, 10, 15, 20 and 30 . . . . . . . . . . . . . 5-9

SENTRON VL System ManualGWA 4NEB 110 0110-02 ix

Figure 5-3: The response time of the device after an overload release . . . . . . 5-9Figure 5-4: Current-time curve before and after overload, with thermal memory . 5-10Figure 6-1: Circuit diagram for VL160X - VL630 . . . . . . . . . . . . . . . . . . 6-2Figure 6-2: Circuit diagram for VL160 - VL250 . . . . . . . . . . . . . . . . . . . 6-3Figure 6-3: Circuit diagram for VL400 circuit-breaker for motor protection and

VL400 - VL1600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3Figure 6-4: Stored energy operator for the VL160X - VL250, without undervoltage

release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4Figure 6-5: Stored energy operator for the VL160X - VL250, with undervoltage

release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4Figure 6-6: Stored energy operator for the VL400 - VL800, without undervoltage

release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5Figure 6-7: Stored energy operator for the VL400 - VL800, without undervoltage

release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5Figure 6-8: Stored energy operator for the VL1250 and VL1600, without

undervoltage release. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6Figure 6-9: Stored energy operator for the VL1250 and VL1600, with undervoltage

release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6Figure 6-10:Undervoltage and shunt release for VL160X to VL1600 . . . . . . . . 6-7Figure 6-11:3TX4701-0A delay unit for the undervoltage releases of the VL160X

to VL1600. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7Figure 6-12:4-pole 3VL1 with RCD module . . . . . . . . . . . . . . . . . . . . . 6-8Figure 6-13:4-pole circuit-breaker for VL160, VL1250, VL400 . . . . . . . . . . . . 6-8

SENTRON VL System Manualx GWA 4NEB 110 0110-02

Tables

Table 1-1: Switching capacity overview . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Table 1-2: Degree of protection overview . . . . . . . . . . . . . . . . . . . . . . . . 1-8Table 1-3: Derating factors at high altitudes . . . . . . . . . . . . . . . . . . . . . . . 1-9Table 1-4: Thermomagnetic overcurrent release derating factors . . . . . . . . . 1-10Table 1-5: Thermomagnetic overcurrent release derating factors (plug-in or

withdrawable versions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11Table 1-6: Thermomagnetic overcurrent release derating factors + RCD module

(fixed mounted versions) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12Table 1-7: Thermomagnetic overcurrent release derating factors + RCD module

(plug-in or withdrawable versions) . . . . . . . . . . . . . . . . . . . . . . 1-12Table 1-8: Electronic overcurrent release derating factors (fixed mounted versions) 1-13Table 1-9: Electronic overcurrent release derating factors (plug-in or withdrawable

version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13Table 1-10: Thermomagnetic overcurrent release derating factors . . . . . . . . . 1-14Table 1-11: Overview of deviating network frequencies . . . . . . . . . . . . . . . . 1-15Table 1-12: Heat loss for thermomagnetic overcurrent releases (TM) . . . . . . . 1-17Table 1-13: Heat loss for electrical overcurrent releases (ETU/LCD ETU) . . . . . 1-18Table 1-14: Overview of the RCD modules . . . . . . . . . . . . . . . . . . . . . . . . 1-22Table 1-15: Overcurrent release system overview . . . . . . . . . . . . . . . . . . . 1-23Table 1-16: Order No. scheme (MRPD) for 3VL components . . . . . . . . . . . . . 1-35Table 2-1: Overview of the types of installation . . . . . . . . . . . . . . . . . . . . 2-2Table 2-2: Safety clearances between circuit-breakers . . . . . . . . . . . . . . . . 2-7Table 2-3: Recommended cable mounting clearances . . . . . . . . . . . . . . . . 2-8Table 2-4: Connection types (for Ue ≤ 600 V AC/500 V DC) . . . . . . . . . . . . . 2-9Table 2-5: Connection types (for Ue <= 600 V AC/500 V DC) . . . . . . . . . . . . 2-13Table 4-1: Accessory overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6Table 4-2: Technical data for the leading auxiliary switch . . . . . . . . . . . . . . . 4-8Table 5-1: SENTRON VL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2Table 5-2: Example selections for capacitor protective circuits . . . . . . . . . . . 5-4Table 5-3: Suggested circuits for 3-pole and 4-pole circuit-breakers . . . . . . . . 5-6Table 5-4: Circuit-breaker for motor protection with fixed release class ETU 10M 5-10Table 5-5: Circuit-breaker for motor protection with adjustable release class

ETU 30M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11Table 5-6: Circuit-breaker for motor protection with adjustable release class

ETU 40M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

SENTRON VL System ManualGWA 4NEB 110 0110-02 xi

SENTRON VL System Manualxii GWA 4NEB 110 0110-02

Important Information

Purpose of this manualThis manual is a reference document. The information contained within it enables you to configure and use the SENTRON VL system.

Intended readersThis manual is designed for people who possess the required qualifications to commis-sion and operate the SENTRON VL system.

ValidityThis manual is valid for the following circuit-breakers:

SENTRON VL160XVL160VL250VL400VL630VL800VL1250VL1600

Standards and licensesSENTRON VL circuit-breakers conform to the following specifications:• IEC 60947-1, EN 60947-1• DIN VDE 0660, Part 100• IEC 60947-2, EN 60947-2• DIN VDE 0660, Part 101• Circuit-breaker characteristics according to IEC 60947-3, EN 60947-3

Exclusion of liabilityThe products described here were developed to carry out protection tasks as part of a complete plant or machine. In general, a complete safety system consists of sensors, evaluation units, signaling devices and methods for safe switching off. It is the responsi-bility of the manufacturer of the system or machine to ensure the safe functioning of the complete system or machine. Siemens AG, its subsidiaries and associated companies (herein referred to as "Siemens") is not in the position to guarantee every characteristic of a complete plant or machine that is not designed by Siemens.

Siemens denies all responsibility for any recommendations that are given or implied in the following description. No new guarantee, warranty or liability above those standard to Siemens can be derived from the following description.

SENTRON VL System ManualGWA 4NEB 110 0110-02 xiii

Important Information

Continuously updated informationFurther support can be obtained by calling the following numbers:

Technical Assistance: Telephone: +49 (0) 911-895-5900 (8°° - 17°° CET)Fax: +49 (0) 911-895-5907

or online at:

E-mail: [email protected]: www.siemens.com/lowvoltage/technical-assistance

Technical Support: Telephone:+49 (0) 180 50 50 222

Correction sheetA correction sheet is included at the end of this manual. Please use it to fill in improve-ments, supplementations and correction suggestions and send it back to us. These help us to improve the next version.

SENTRON VL System Manualxiv GWA 4NEB 110 0110-02

SENTRON VL System Overview 1

SENTRON VL System ManualGWA 4NEB 110 0110-02 1-1

SENTRON VL System Overview

1.1 Service conditions

SENTRON VL circuit-breakers from Siemens are climate-proof. They are intended for use in closed rooms where there are no excessive operating condi-tions (e.g. dust, corrosive vapors or damaging gases).Suitable enclosures must be provided if the circuit-breakers are to be installed in dusty or humid locations. Sufficient fresh air supply must be provided if there are harmful gases (e.g. hydrogen-sulfide vapor) in the ambient air.The maximum permissible ambient temperature range and the rated operational currents permitted at different ambient temperatures are listed in the technical data.

1.2 Application overview

Line protection

The releases for line protection are designed to protect cables, wiring, and non-motorized consumers against overloads and short circuits.

Motor/generator protection

The overload and short-circuit releases are designed for optimal protection and the direct-starting of three-phase current squirrel-cage motors. The circuit-breakers for motor protection possess phase loss sensitivity and a thermal memory which protect the motor against over-heating. The specifiable time lag class enables the user to select the overload release settings for the start- up conditions of the motor which is to be protected.

Starter combination

Starter combinations consist of: Circuit-breaker + contactor + overload relay. The circuit-breaker takes over the short circuit protection and the isolating function. The contactor has the task of switching the load feeder during operation. The overload relay carries out the overload protection, which can be specifically defined for the respective motor. The circuit-breaker for the starter combination is thus equipped with an adjustable, instantaneous short-circuit release.

Non-automatic circuit-breaker

These circuit-breakers are used as incoming circuit-breakers, main switches or disconnectors without over-load protection. They are equipped fixed short-circuit releases so back-up fuses are not needed.

SENTRON VL System Manual1-2 GWA 4NEB 110 0110-02


1.3 SENTRON VL overview

Figure 1-1: SENTRON VL overview

1 Switch unit

2 Interchangeable overcurrent release (TM, ETU, ETU-LCD)

3 Internal accessories(Shunt release, undervoltage release, auxiliary and alarm switch)

4 Flared busbar extensions

5 Front connecting bars

6 Multiple feed-in terminal

7 Rear terminals

8 Terminal covers and phase barriers

9 Plug-in socket

10 Withdrawable version kit

11 Rotary/motorized operating mechanism

12 Cover frames

13 RCD module

10

9

12

11

1

33

2

13

4

8

5

67



1.4 Switching capacity overview

Table 1-1: Switching capacity overview

Rat

ed c

urre

ntI n

(A)

1620

2532

4050

6380

100

125

160

200

250

315

400

500

630

800

1000

1250

1600

Sta

ndar

d sw

itchi

ng c

apac

ity N

Hig

h sw

itchi

ng c

apac

ity H

Ver

y hi

gh s

witc

hing

cap

acity

L

Fo

r p

lan

t p

rote

ctio

n

VL2

50

Fo

r m

oto

r p

rote

ctio

n

VL4

00

VL6

30

VL8

00

VL1

250

3- a

nd 4

-pol

e V

L160

X

VL1

60X

VL1

60

VL1

600

circ

uit-

brea

kers

VL1

60

3-po

le c

ircui

t-br

eake

rs

VL2

50

VL4

00

VL6

30

VL8

00

VL1

250

VL1

600

VL1

60

VL2

50

VL4

00

VL6

30

VL1

60

VL2

50

VL4

00

VL6

30

Fo

r st

arte

r co

mb

inat

ion

s

3-po

le c

ircui

t-br

eake

rs

3- a

nd 4

-pol

e ci

rcui

t-br

eake

rs

No

n-a

uto

mat

icci

rcu

it-b

reak

ers



1.5 Technical overview

1) Rated insulation voltage of the main conducting path Ui=800 V AC2) DC ratings are for thermomagnetic overcurrent releases only3) For nominal currents above 25 A. The VL160X is not available with a nominal voltage of 690 V AC for nominal currents

of 16 A and 20 A.

TYPE SENTRON VL160X VL160 VL250 VL400

Rated current at an ambient tem-perature of 50 °C

16 to 160 A 26 to 160 A 80 to 250 A 125 to 400 A

Number of poles 3 4 3 4 3 4 3 4

Rated operational voltage Ue1)

(AC) 50 - 60 Hz [V] 690 690 690 690

(DC) 2) [V] 250 250 600 600 600 600 600 600

Overcurrent release

Thermomagnetic TM X X X X X X X X

Electronic release ETULCD

––

––

XX

XX

XX

XX

XX

XX

Interchangeability – – X X X X X X

mm Amm Bmm Cmm D

10515781

107

13915781

107

10517581

107

13917581

107

10517581

107

13917581

107

139279102138

183279102138

SENTRON VL - N Interruption rating (kA) balanced (standard switching capacity)

Icu/Ics Icu/Ics Icu/Ics Icu/Ics

IEC 60947-2

up to 240 V AC415 V AC440 V AC500 V AC690 V AC

65/6540/4025/2018/148/4 3)

65/6540/4025/2025/2012/6

65/6540/4025/2025/2012/6

65/6545/4535/2625/2015/8

up to 250 V AC500 V DC600 V DC

30––

32––

32––

32––

SENTRON VL - H Interruption rating (kA) balanced (high switching capacity)


IEC 60947-2


100/7570/7042/3230/2312/6 3)

100/7570/7050/3840/3012/6

100/7570/7050/3840/3012/6

100/7570/7050/3840/3015/8


30––

3232–

3232–

3232–



1) Rated insulation voltage of the main conducting paths Ui=800 V AC2) DC ratings are for thermomagnetic overcurrent releases only

TYPE SENTRON VL160X VL160 VL250 VL400

SENTRON VL - L Interruption rating (kA) balanced (very high switching capacity)


IEC 60947-2


–––––

200/150100/7575/5050/3812/6

200/150100/7575/5050/3812/6

200/150100/7575/5050/3815/8


–––

323230

323230

323230

TYPE SENTRON VL630 VL800 VL1250 VL1600

Rated current at an ambient tem-perature of 50 °C

252 to 630 A 320 to 800 A 400 to 1250 A 640 to 1600 A

Number of poles 3 4 3 4 3 4 3 4

Rated operational voltage Ue1)

(AC) 50 - 60 Hz [V] 690 690 690 690

(DC) 2) [V] 600 600 – – – – – –

Overcurrent release

Thermomagnetic TM X X – – – – – –

Electronic release ETULCD

X X X X X X X X

Interchangeability X X X X X X X X

mm Amm Bmm Cmm D

190279102138

253279102138

190406114151

253406114151

229406152207

305406152207

229406152207

305406152207

SENTRON VL - N Interruption Rating (kA) balanced


IEC 60947-2

up to 240 V AC415 V AC690 V AC

65/6545/4520/10

65/6550/5020/10

65/3550/2520/10

65/3550/2520/10


32––

–––

–––

–––



1.6 Standards and specifications

The SENTRON VL circuit-breakers comply with:• IEC 60947-1, EN 60947-1• DIN VDE 0660, Part 100• IEC 60947-2, EN 60947-2• DIN VDE 0660, Part 101

Isolating characteristics according to: • IEC 60947-3, EN 60947-3

Please contact SIEMENS for additional standards.

Furthermore, the overcurrent release of the circuit-breaker for motor protection also complies with: • IEC 60947-4-1• DIN VDE 0660, Part 102.

Main switch: • DIN EN 60204 and • DIN VDE 0113 (see Application)

EMERGENCY STOP switch: • DIN EN 60204 and • DIN VDE 0113 (see Application)

The following certificates are available on request:• CE document of conformity• Certificate of conformance test - ICE 60947• Certificate of conformance test - CCC (China)• Type approvals for use on ships (GL, LRS, DNV)• Letter of origin• Halogen-free• PVC free

TYPE SENTRON VL630 VL800 VL1250 VL1600

SENTRON VL - H Interruption Rating (kA) balanced


IEC 60947-2


100/7570/7030/15

100/7570/7030/15

100/5070/3530/15

100/5070/3530/15


3232–

–––

–––

–––

SENTRON VL - L Interruption Rating (kA) balanced


IEC 60947-2


200/150100/7535/17

200/150100/7535/17

200/100100/5035/17

200/100100/5035/17


323230

–––

–––

–––



1.7 Degree of protection

All Siemens SENTRON VL molded-case circuit-breakers are constructed with degree of protection IP20, independent of their size and version.A wide range of additional accessories are also available for the basic version of the SENTRON VL circuit-breaker with IP20.The accessories listed below are designed to provide an even higher degree of protection:The degree of protection according to IEC 60529 is listed in the following table:

Circuit-breaker

Finger-proofProtects against solid foreign objects with a diameter of 12.5 mm or larger

IP20

Circuit-breaker with terminal cover

Prevents access to live parts with a toolProtects against solid foreign objects with a diameter of 2.5 mm or larger

IP30

Plug-in circuit-breaker

Finger-proofProtects against solid foreign objects with a diameter of 12.5 mm or larger * When the circuit-breaker is installed and the supplied covers are

mounted.

IP20

IP30*

Circuit-breaker with cover frame and motorized operating

mechanism

Prevents access to live parts with a wireProtects against solid foreign objects with a diameter of 1.0 mm or larger

IP40

Circuit-breaker with cover frame for door cutout


IP40

Circuit-breaker with cover frame and rotary direct drive


IP40

Circuit-breaker with rotary operating mechanism

Protection against ingress of dust and water jets from any direction.

IP65

Table 1-2: Degree of protection overview



1.8 Application conditions

1.8.1 General

Siemens SENTRON VL circuit-breakers are resistant to most climatic changes. All Siemens SENTRON VL circuit-breakers are designed to function in 50/60 Hz networks up to 50 °C without derating. Derating factors may have to be taken into consideration when the circuit-breaker is used at higher ambient tempera-tures, at altitudes above 2000 meters or in networks with different frequencies. Please use the appropriate tables in Section 1.9 and Section 1.10.

SENTRON VL circuit-breakers have been designed for use in enclosed rooms, in which no adverse operating conditions exist (e.g. dust, corrosive vapors, damag-ing gases).Suitable enclosures must be provided if the circuit-breakers are to be installed in dusty or humid locations. Sufficient fresh air supply must be provided if there are harmful gases (e.g. hydrogen-sulfide vapor) in the ambient air.The maximum permissible ambient temperature range and the rated operational currents permitted at different ambient temperatures are given in the technical data.

1.8.2 Shock resistance

All Siemens SENTRON VL circuit-breakers are shock resistant in accordance with test procedures outlined in IEC 68 Part 2

1.8.3 Current limitation

ALL of the Siemens SENTRON VL circuit-breakers are designed according to the principle of magnetic contact repulsion. The contacts open before the pro-spective peak value of the short-circuit current is reached. The magnetic contact repulsion considerably reduces the thermal load I2t as well as the mechanical load which occur during a short-circuit due to the maximum aperiodic short-cir-cuit current of the system components IP.

1.9 Derating factors at high altitudes

The lower air pressure at altitudes above 2000 meters affects the electrical char-acteristic data of the molded-case circuit-breakers. The following table lists the derating factors that must be taken into consideration when using circuit-break-ers at altitudes above 2000 meters.

Circuit-breaker Altitude [m]

2000 3000 4000

All

Dielectric strength 1.0 0.9 0.8

Operating voltage 1.0 0.9 0.8

Factor x In at 50 °C 1.0 0.96 0.92

Table 1-3: Derating factors at high altitudes



1.10 Derating factors for special environmental conditions

A reduction (derating) of the rated operational current of the SENTRON VL cir-cuit-breaker is necessary if the ambient temperature exceeds 50 °C. The limit temperature is 40 °C for circuit-breakers with RCD modules or plug-in/withdraw-able versions.The permissible loads for various ambient temperatures in relationship to the rated operational current of the circuit-breaker are shown in the Technical Data list.Furthermore, the following points must be taken into consideration, because each one of these factors can influence the rated operational current and per-missible load.• Type of circuit-breaker (fixed mounted, plug-in and withdrawable versions)• Type of main connection (vertical-horizontal busbar, cable)• Ambient temperature of the circuit-breaker• Altitude derating factors (see Section 1.9)• Temperature derating factors based on the type of release and connection used (See

Section 1.10.2 to Section 1.10.4)• Degree of protection (see Section 1.7)

1.10.1 Thermomagnetic overcurrent release

Fixed mounted versions:

Circuit-

breaker

In

at 50 °C

Cross

section Cu

mm² min.

Cross

section Al

mm² min.

Max. rated uninterrupted current

according to the ambient temperature

x In

40 °C 50 °C 60 °C 70 °C

VL160X 16 A20 A25 A32 A40 A50 A63 A80 A100 A125 A160 A

2.52.54610101625355070

4461010162535507095

1 1 0.93 0.86

VL160 50 A63 A80 A100 A125 A160 A

101625355070

162535507095

1 1 0.93 0.86

VL250 200 A250 A

95120

120185

1 1 0.93 0.86

VL400 200 A250 A315 A400 A

95120185240

120185

2x1202x150

1 1 0.93 0.86

Table 1-4: Thermomagnetic overcurrent release derating factors



Plug-in or withdrawable versions

Example for VL250:• In = 200 A at 50 °C• Ambient temperature = 60 °C

In = 200 x 0.93 = 186 A for fixed mounted versionIn = 200 x 0.93 x 0.9 = 167 A for plug-in version

VL630 315400500630

185240

2x1502x185

2x1202x1502x1852x240

1 1 0.93 0.86

Circuit-breaker Release

thermomagnetic TM

Coefficient

at

From [A] to [A] 40 °C 50 °C 60 °C 70 °C

VL160X 16 40 1 1 1 1

VL160 & VL160X

50125

100160

11

10.9

10.9

10.9

VL250 200 250 1 0.9 0.9 0.9

VL400 200315

250400

11

10.9

10.9

10.9

VL630 315500

400630

11

10.85

10.85

10.85

Table 1-5: Thermomagnetic overcurrent release derating factors (plug-in or withdrawable versions)

Circuit-

breaker

In

at 50 °C

Cross

section Cu

mm² min.

Cross

section Al

mm² min.



x In

40 °C 50 °C 60 °C 70 °C




1.10.2 Thermomagnetic overcurrent release + RCD module


Plug-in or withdrawable versions

Circuit-breaker In at

50 °C

Cross

section

Cu

[mm2]

min.

Cross

section

Al

[mm2]

min.



x In

40 °C 50 °C 60 °C) 70 °C

VL160X 16 A20 A25 A32 A40 A50 A63 A80 A100 A125 A160 A

2.52.54610101625355070

4461010162535507095

1 1 0.93 0.80

VL160 50 A63 A80 A100 A125 A160 A

101625355070

162535507095

1 1 0.93 0.80

VL250 200 A250 A

95120

120185

1 1 0.86 0.80

VL400 200 A250 A315 A400 A

95120185240

120185

2x1202x150

1 1 0.86 0.80

Table 1-6: Thermomagnetic overcurrent release derating factors + RCD module (fixed mounted versions)

Circuit-breaker Release

thermomagnetic TM

Coefficient

at

From [A] to [A] 40 °C 50 °C 60 °C 70 °C

VL160X 16 40 1 1 1 1

VL160 & VL160X

50125

100160

11

0.970.88

0.970.88

0.970.88

VL250 200 250 1 0.85 0.85 0.85

VL400 200315

250400

11

0.970.85

0.970.85

0.970.85

Table 1-7: Thermomagnetic overcurrent release derating factors + RCD module (plug-in or withdrawable versions)



1.10.3 Electronic overcurrent release


Plug-in or withdrawable version

Example for VL250:• In = 250 A at 50 °C• Ambient temperature = 60 °C

In = 250 x 0.95 = 237 A for fixed mounted versionIn = 250 x 0.95 x 0.9 = 213 A for plug-in version

• Set IR to next possible value

IR = 0.95 In for fixed mounted versionIR = 0.8 In for plug-in version

Circuit-

breaker

In at 50 °C Cross

section Cu

[mm2]

min.

Cross

section Al

[mm2]

min.

Max. permanent rated current


x In

40 °C 50 °C 60 °C 70 °C)

VL160 63 A100 A160 A

163570

255095

1 1 1 0.80

VL250 200 A250 A

95120

120185

11

11

10.95

0.800.80

VL400 315 A400 A

185240

2x1202x150

11

11

10.95

0.800.80

VL630 630 A 2x185 2x240 1 1 0.95 0.80

VL800 800 A 2x 50x5 1 1 0.95 0.80

VL250 1000 A1250 A

2x 60x52x 80x5

11

11

10.95

0.800.80

VL1600 1600 A 2x 100x5 1 1 0.95 0.80

Table 1-8: Electronic overcurrent release derating factors (fixed mounted versions)

Circuit-breaker Electronic

release ETU

Coefficient

at

From [A] to [A] 40 °C 50 °C 60 °C 70 °C

VL160 63125

100160

11

10.9

10.9

10.9

VL250 200 250 1 0.9 0.9 0.9

VL400 315 400 1 0.9 0.9 0.9

VL630 630 1 0.85 0.85 0.85

VL800 800 1 0.9 0.9 0.9

VL1250 1000 1250 1 0.95 0.95 0.95

VL1600 1600 1 0.8 0.8 0.8

Table 1-9: Electronic overcurrent release derating factors (plug-in or withdrawable version)



1.10.4 Thermomagnetic overcurrent release

The thermomagnetic overcurrent releases are calibrated to 50 °C. As a result, the tripping times of the thermal overcurrent release increase for a constant cur-rent at low temperatures.In order to correct the tripping times, the thermal overcurrent release settings must be changed by the following factor (lower settings)

Example for VL250:• In = 250 A at 50 °CSetting the thermal overcurrent release: 250A

• Ambient temperature = 20 °CCorrected setting = 250 x 0.87 = 217 A

1.11 Application in networks with different frequencies

1.11.1 Influence of network frequency and harmonics on the operation of

switching devices

If low-voltage switching devices designed for 50/60Hz are to be used at other network frequencies, the following points must be taken into consideration:• Thermal effects on the system components,• Switching capacity• Service life of the contact system,• Tripping characteristics of the overcurrent release• Behavior of the accessories

1.11.2 Thermal rating of the system components and conductor depending on

the network frequency

In contrast to direct current, alternating current does not flow uniformly through the whole cross section of a conductor. The current density increases near the surface. The phenomenon amplifies with increasing frequency. At very high fre-quencies the center of the conductor carries almost no current and the current actually only flows in a thin layer on the surface of the conductor. This is com-monly known as the “skin effect”. As a result of this “skin effect”, the conductor cross-section only partly carries current. The impedance of conductors increases linearly with increasing frequency.

Circuit-breaker At 0°C At 10°C At 20°C At 30°C At 40°C At 50°C

VL160X 0.80 0.83 0.87 0.90 0.95 1

VL160 0.80 0.83 0.87 0.90 0.95 1

VL250 0.80 0.83 0.87 0.90 0.95 1

VL400 0.80 0.83 0.87 0.90 0.95 1

VL630 0.80 0.83 0.87 0.90 0.95 1




1.11.3 Current carrying capacity of circuit-breakers

Circuit-breakers designed for an AC voltage of 50/60Hz can be used for at least the same rated currents at lower frequencies. In contrast to this however, the permissible operational current must be reduced at frequencies above 100Hz to ensure that the specified temperature rise limits are not exceeded. For exam-ple, at 400 Hz the permissible current carrying capacity must be reduced by between 50 % and 80 % compared to the current carrying capacity at 50 Hz.

1.11.4 Usage in 16 2/3 Hz networks

Circuit-breakers must be selected according to their DC switching capacities for frequencies up to 16 2/3 Hz. These values are given in the Siemens LV30 cata-log “Products and Systems for Power Distribution”. The rated operational current of the circuit-breaker is the same at 16 2/3 Hz and 380/400 V as it is at 50/60 Hz – 3-pole, whereby two poles are used in series. At 16 2/3 Hz and 500V, all three poles must be used in series.

1.11.5 Usage in 50/60 Hz networks

These are the normal operating conditions. The required version can be selected in the Siemens LV 30 catalog “Products and Systems for Power Distri-bution” according to the required ambient temperature, switching capacity, etc.

1.11.6 Circuit-breakers for 400 Hz applications

On request

Version Type VL used in networks with:

16 2/3 Hz 50/60 Hz 400 Hz DC

VL160X TM Yes Yes on req. Yes

VL160ETU/LCD No Yes No No

TM Yes Yes on req. Yes







VL800 ETU/LCD No Yes No No



Table 1-11: Overview of deviating network frequencies



1.11.7 Usage in DC voltage systems

Siemens SENTRON VL circuit-breakers with thermomagnetic overload releases are suitable for use in DC networks.However, SENTRON VL circuit-breakers that employ electronic overcurrent releases are not suitable for DC networks.The maximum rating information and the wiring configuration for DC switching is shown in Section 5.3.

1.12 Influence of temperature and humidity on overcurrent

release

1.12.1 Thermomagnetic overcurrent release TM

1.12.2 Electronic overcurrent release ETU

1.12.3 Electronic overcurrent release LCD - ETU

Figure 1-2: Thermal / magnetic TM–25 °C to + 50 °C, 95%

Siemens thermomagnetic SENTRON VL overcurrent releases are designed to be used in ambient tempera-tures up to 70 °C and a non-condensing humidity of up to 95%. The appropriate correction factors must be applied for ambient temperatures above 50 °C. See Section 1.10.1 on Page 10.

Figure 1-3: Standard ETU-25 °C up to +70 °C, 95%

The electronic SENTRON VL overcurrent releases are designed for ambient temperatures up to 70 °C and a non-condensing humidity of up to 95%. The appropri-ate correction factors must be applied for ambient temperatures above 50 °C. See Section 1.10.3 on Page 13.

Figure 1-4: ETU/LCD-25 °C up to +70 °C, 95%

The high-quality electronic SENTRON VL overcurrent releases are designed for ambient temperatures up to 70 °C and a non-condensing humidity of up to 95%. The appropriate correction factors must be applied for ambient temperatures above 50 °C. See Section 1.10.3 on Page 13.



1.13 Heat loss for fixed mounted circuit-breakers

1.13.1 Heat loss for thermomagnetic overcurrent releases (TM)

Heat loss for In for 3-phase balanced load

Type Rated current [A] Heat loss [W]

VL160X 16 12

20 19

25 12

32 12

40 18

50 16

63 19

80 30

100 24

125 33

160 42

VL160 50 16

63 20

80 25

100 25

125 35

160 45

VL250 200 45

250 55

Vl400 200 60

250 70

315 110

400 135

VL630 315 85

400 120

500 170

630 230

Table 1-12: Heat loss for thermomagnetic overcurrent releases (TM)



1.13.2 Heat loss for electrical overcurrent releases (ETU/LCD ETU)

Heat loss for In for 3-phase balanced load

1.14 Circuit-breakers with differential current protection – RCD module

The SENTRON VL RCD modules are available as accessories to the VL160X, VL160, VL250 and VL400 circuit-breakers with thermomagnetic overcurrent releases. This combination is referred to as a circuit-breaker with differential cur-rent protection Type A. Type A means that the tripping operation is ensured for faults in both sinusoidal alternating currents and pulsed direct currents. These modules have an adjustable tripping time delay ∆t. The values for the rated fault current I∆n can also be set.

In a faultless system, the sum of the currents in the summation current trans-former of the RCD module is zero. A ground fault current appearing due to an insulation fault in the protected circuit results in a differential current, which induces a voltage in the secondary winding of the current transformer. The eval-uation electronics monitors the induced voltage and sends a tripping command to the RCD release if the trip criterium is fulfilled. The combination of the circuit-breaker with the differential current protection is designed to cause the circuit-breaker contacts to open when the residual current reaches a specified value. The circuit-breaker with differential current protection is frequently used to achieve a two-fold function:• provide protection for the system against overload and short-circuit currents.• provide protection for the wiring and electrical equipment against damage by ground

faults.

The VL160X – VL400 circuit-breakers equipped with a SENTRON VL RCD mod-ule comply with IEC60947-2 (see Appendix B).The SENTRON VL RCD module complies with IEC 61000-4-2 to 61000-4-6,IEC 61000-4-11 and EN 55011, Class B (corresponds to CISPR 11) with regard to electromagnetic compatibility.

Type Rated current [A] Heat loss [W]

VL160 63 7

100 16

160 40

VL250 200 42

250 60

VL400 315 60

400 90

VL630 630 160

VL800 800 250

VL1250 1000 135

1250 210

VL1600 1600 260

Table 1-13: Heat loss for electrical overcurrent releases (ETU/LCD ETU)



The reference ambient temperature for the RCD module and the SENTRON VL circuit-breaker is 40 °C. Integration of the SENTRON VL RCD module with the SENTRON VL circuit-breaker has no effect on the characteristic data of the cir-cuit-breaker, for example:• Rated voltage (50/60 Hz), switching capacity• Electrical and mechanical service life• Connections• Operating mechanisms (VL160, VL250, VL400)• Auxiliary switch and releaseFor more information on the rated current, see Section 1.10

Standard Features• Mechanical tripping display:

The reset button pops out when the RCD trips the circuit-breaker.• Reset button:

must be manually reset after the RCD trips the circuit-breaker. The circuit-breaker can not be reset and closed without first resetting the RCD.

• Cover:Changeable settings for ∆t and I∆n.A transparent sealable cover is available to prevent changes from being made.

• LED displays:3 LEDs (green/yellow/red) display the level of the leakage/fault current. The LEDs will flash to indicate that the SENTRON VL RCD is ready for operation.– Green: I∆ = 25% of the specified value, voltage is applied to the

conductor– Geen+yellow: 25% < I∆ < 50% of the specified I∆n value– Green+yellow+red: I∆ = 50% of the specified I∆n value

• Test button:The functioning of the RCD module can be checked with the test button. When the test button is pressed, a differential current is simulated by one of the test windings of the summation current transformer. If functioning correctly, the RCD module must trip the circuit-breaker.The test button must be depressed at least as long as the specified time delay ∆t.

• A network disconnecting device:enables the evaluation electronics of the RCD module to be disconnected from the cir-cuit without removing the primary cable or the busbar (e.g. before carrying out isola-tion tests)– Limit the maximum dielectric withstand voltage to an r.m.s. value of 3500 V AC for

this feature.• Protective functionality down to 50 V AC between phase and the neutral conductor.• The RCD module has a surge withstand strength of Ipeak = 2000 A. The standard

impulse wave is defined as an 8/20-µs waveshape.• The RCD module will not trip on inrush currents

∆t ≥ 0 Irms = 3000A

∆t ≥ 60ms • The circuit-breaker and differential current protection combination can be fed from

both sides.• Appropriate standard circuit-breaker accessories – terminal covers, phase barriers,

wire connectors

Ipeak 20 In 2××=



Special features of the VL160X

• The circuit-breaker is tripped via an electromechanical tripping relay, which is installed in the compartment for circuit-breaker accessories to the left of the toggle handle. The tripping unit is connected to the SENTRON VL RCD module and receives a tripping command when the pre-set fault current levels are reached.

• Additional internal accessories can be installed in the SENTRON VL accessory com-partment to the right of the toggle handle.

• The reset button functions in the same manner as for the VL160 to 400 RCD modules and is accessible via the circuit-breaker accessory cover that is provided with this module.

• A special kit is available for mounting the RCD module and the VL160X side by side. The mounting adapter allows mounting onto a DIN 50023 rail. The collar of the combi-nation is 45 mm wide over its entire length.

• Stored energy operators and rotary drives can not be installed in this product.

Special Features of the VL160, VL250, VL400• The circuit-breaker is tripped via a direct-acting plunger from the RCD module to the

line circuit-breaker. The electromechanical trip unit is integrated in the RCD module.• The reset button pops out above the surface of the RCD module cover to indicate that

the RCD module has tripped the line circuit-breaker. This device prevents the contacts of the line circuit-breaker from being closed before the RCD module reset button is manually reset.

• This construction is compatible with the line circuit-breaker accessories, including those accessories for external operating mechanisms as well as for fixed mounted, plug-in and withdrawable versions.

• An auxiliary switch (changeover switch) is included in the scope of supply. The con-tacts change their state when the RCD module trips the line circuit-breaker. The con-tact is suitable for– 2 A 250 V AC applications (0.5 A inductive)– 0.5 A 125 V DC.The smallest switching capacity is 50 mA at 5V AC/DC.

• Remote tripping is also possible. The customer can connect a switch (NO contact) to terminals X13.1 and X13.3 using a twisted pair cable. The switching contact should possess a minimum switching capacity of 5 V/1 mA (e.g. SIEMENS 3SB3). The RCD module trips if the NO contact is actuated. Terminals X13.1 and X13.3 are galvanically isolated from the network using a transformer (functional extra-low voltage, FELV). The max. tripping time of the circuit-breaker with differential current protection is 50 ms regardless of the specified tripping time delay ∆t. In special circumstances, e.g. when the wiring is laid outdoors, it should be ensured that the overvoltage amplitude (e.g. storm overvoltage) between the conductor and the ground is limited to 2.5 kV through suitable installation or protective circuitry.

Special requirements:• Every RCD module requires a separate conductor for remote tripping. It is not possible

to use one cable and to switch two or more RCD modules in parallel. The use of two or more switches in parallel for remote control of one RCD module is allowed.

• The customer is to provide an unshielded or shielded twisted pair cable with a maxi-mum capacitance of 36 nF and a maximum resistance of 50 Ohms (total length = go-and-return). Example: The maximum cable length for a cable with a capacitance of 120 nF/km is 300 m. When using a shielded cable, the shield may not be placed on the line PE con-ductor.

• A separate conductor should connect terminal X13.2 to the ground bus (E or PE). This connection is recommended in order to prevent electrostatic charging of the remote tripping cable. This is particularly applicable when long cables (>10 m) are used. Other-wise the remote tripping cable is floating.



Design of the RCD module

Figure 1-5: VL160X with RCD module



Figure 1-8: Left-side mounting for VL160X with RCD module

Figure 1-9: RCD module for VL160

Reset

Reset



RCD module

Circuit-breaker for

line protection:

3-pole and 4-pole

Rated current

In

A

Adjustable

differential

current I∆n

A

Time delay

td

adjustable

Rated

operational

voltage

Ue

V AC

VL160X(mounting from below)(mounting on the left)

160

0.030.100.300.501.003.00

Instantaneous0.060.100.250.501.00

127 - 480

VL160 160127 - 480230 - 690

VL250 250127 - 480230 - 690

VL400 400127 - 480230 - 690

Table 1-14: Overview of the RCD modules



1.15 Overcurrent release system overview

Table 1-15: Overcurrent release system overview

VL

160

to V

L16

00 O

verc

urr

ent

Rel

ease

Sys

tem

Ove

rvie

wO

verc

urr

ent

rele

ases

LI *

G

I r=

x I n

I sd=

x I r

t sd

[s]

I i= x

I nI g

= x

I n

LI0.

8-1

5-10

3D

CT

M *

*

LI0.

8-1

5-10

4E

JT

M *

*

LI0.

8-1

5-10

4E

CT

M *

*

LI0.

4-1

1.25

-11

3A

PE

TU

10

M**

LI0.

4-1

1.25

-11

3A

BE

TU

10

LI0.

4-1

1.25

-11

4B

BE

TU

10

LI0.

4-1

1.25

-11

4B

AE

TU

10

LIG

0.4-

11.

25-1

11

a3

AC

ET

U 1

2

LIG

0.4-

11.

25-1

11

b3

AD

ET

U 1

2

LIG

0.4-

11.

25-1

11

c3

AJ

ET

U 1

2

LIG

0.4-

11.

25-1

11

b4

BC

ET

U 1

2

LIG

0.4-

11.

25-1

11

b4

BD

ET

U 1

2

LSI

0.4-

11.

5-10

0-0,

511

3A

EE

TU

20

LSI

0.4-

11.

5-10

0-0,

511

4B

EE

TU

20

LSI

0.4-

11.

5-10

0-0,

511

4B

FE

TU

20

LSIG

0.4-

11.

5-10

0-0,

511

1a

3A

GE

TU

22

LSIG

0.4-

11.

5-10

0-0,

511

1b

3A

HE

TU

22

LSIG

0.4-

11.

5-10

0-0,

511

1c

3A

KE

TU

22

LSIG

0.4-

11.

5-10

0-0,

511

1b

4B

GE

TU

22

LSIG

0.4-

11.

5-10

0-0,

511

1b

4B

HE

TU

22

LSI

0.4-

16/

8/11

3A

SE

TU

30

M**

*

LSI

0.4-

11.

25-1

13

CP

LCD

ET

U 4

0 M

***

LI,L

S,L

SI

0.4-

11.

5-10

0-0,

51.

25-1

13

CH

LCD

ET

U 4

0

LI,L

S,L

SI

0.4-

11.

5-10

0-0,

51.

25-1

14

CJ

LCD

ET

U 4

0

LSIG

0.4-

11.

5-10

0-0,

51.

25-1

10.

4-1

a3

CL

LCD

ET

U 4

2

LSIG

0.4-

11.

5-10

0-0,

51.

25-1

10.

4-1

a/c

3C

MLC

D E

TU

42

LSIG

0.4-

11.

5-10

0-0,

51.

25-1

10.

4-1

b4

CN

LCD

ET

U 4

2

* D

epen

dant

on

fram

e si

zeG

roun

d-fa

ult

prot

ectio

n**

TM

up

to I

n= 6

30 A

a) v

ecto

rial

sum

mat

ion

(3-c

ondu

ctor

sys

tem

)c)

dire

ct m

easu

rem

ent

of t

he g

roun

d-fa

ult

curr

ent

***

Mot

or p

rote

ctio

n up

to

In=

500

Ab)

vec

tori

al s

umm

atio

n (4

-con

duct

or s

yste

m)

in t

he s

tar

of t

he t

rans

form

er

Plant protection

Motor protection

Generator protection

Function

Electronic release

Electronic release with LC-Display

Order number supplement

Set

ting

optio

ns

S *

Release

Thermal memory

Phase failure

Communication-capable

Ground-fault protection

Number of poles

N Pole protected

I²t

Adjustable time-lag

Thermomagnetic release



1.15.1 Thermomagnetic overcurrent release TM VL160X

1.15.2 Thermomagnetic overcurrent release TM VL160-VL630

1.15.3 Electronic overcurrent release ETU VL160-VL1600

General:• No auxiliary voltage is needed for release system• All ETUs have a thermal memory• A flashing green LED indicates correct operation of the microprocessor• Overload status (I > 1.05 x IR) is indicated by a permanently lit yellow LED (alarm)• Integrated self-test function• Socket contact for tester

Application: Line protection - TM,

LI/LIN function (not interchangeable)

Overload protection, fixed settingshort-circuit protection, fixed setting


LI/LIN function (not interchangeable)

Adjustable overload protection IR = 0.8 up to 1 x InShort-circuit protection, fixed setting


Function LI/LIN

Adjustable overload protection IR = 0.8 up to 1 x InAdjustable short-circuit protection Ii = 5 to 10 x In for VL160 to VL630

Application: ETU10 for line protection, LI/LIN

function

Overload protection IR = 0.4; 0.45; 0.5 to 0.95; 1 x In Time-lag class tR = 2.5 to 30Short-circuit protection (instantaneous)Ii = 1.25 up to 11 x In (dependent on frame size)

Application: ETU20 for line and generator pro-

tection, LSI/LSIN function

Overload protection IR = 0.4; 0.45; 0.5 to 0.95; 1 x In Short-circuit protection (instantaneous)Isd = 1.5 to 10 x IR, tsd = 0 to 0.5 sI2t selectable, on/offShort-circuit protection (instantaneous)Ii = 11 x In (fixed setting, dependent on frame size)

L

I2 4 6

63AOFF

CAT.A50° CTM ~=

NSE-00539

L

I

�1.0 .8

R�nx

63AOFF

CAT.A50° CTM ~=

2 4 6

NSE-00540

L

I2

5

6

7

nx

10

9

8

i

4 6

TM

50 C

CAT.A

=160An

x n.8

DCR 1.0

16�

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n�

n�x.7 .63

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108

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sdt 7.5

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sdR�� 56

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(S)

t22

tsd

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t2�.1

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NSE-00543



Application: ETU12 for line protection, LIG/

LING function

Overload protection IR = 0.4; 0.45; 0.5 to 0.95; 1 x In Time-lag class tR = 2.5 to 30Short-circuit protection (instantaneous)Ii = 1.25 up to 11 x In (dependent on frame size)Ground-fault protection: Measuring method no. 1: (GR) vectorial summa-tion in the three phases and neutral conductor (4-conductor system); I∆n = In, Versions “AC”, “AD”, “BC”, “BD”Measuring method no. 2: (GGND) direct measure-ment of the ground-fault current using a current converter which is installed in the Ig = In (instan-taneous) grounded star point; “AJ” versions

Application: ETU20 for line and generator pro-

tection, LSI/LSIN function

Overload protection IR = 0.4; 0.45; 0.5 to 0.95; 1 x In Short-circuit protection (short-time delay)Isd = 1.5 to 10 x IR, tsd = 0 to 0.5 sI2t selectable, on/offShort-circuit protection (instantaneous)Ii = 11 x In (fixed setting, dependent on frame size)Ground-fault protection: Measuring method no. 1: (GR) vectorial summa-tion in the three phases and neutral conductor (4-conductor system); I∆n = In, “AG”, “AH”, “BG”, “BH” versionsMeasuring method no. 2: (GGND) direct measure-ment of the ground-fault current using a current converter, Ig = In (instantaneous); “AK” versions

Application: ETU10 for line protection, LI/LIN

function

Finely adjustable overload protectionIR = 0.41; 0.42 to 0.98; 0.99; 1 x In,Trip class tC = 10 (fixed setting)Thermal memoryShort-circuit protection (instantaneous)Ii = 1.25 up to 11 x In (dependent on frame size)with phase failure sensitivity(see Section 5.4.2)

Application: ETU10 for motor protection, LI

function

Finely adjustable overload protectionIR = 0.41; 0.42 to 0.98; 0.99; 1 x In,Trip class tC = 10 A, 10, 20, 30Thermal memoryShort-circuit protection (instantaneous)Ii = 6 up to 11 x In with phase failure sensitivity

L

IG

NSE0_00693

.95

�

CAT.A

X3

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2086

4

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x�n

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8

10

4

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3

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=250An� ~ 25 ADn n� = �

NSE-00544

NSE0_00921

L

SIG

sd

.95

25 AG

CAT.A

X3

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�x n

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Alarm

>1.05R� sd

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= 250An� ~ 25 AGn

NSE-00545

n� = �

NSE0_00943

L

I

Alarm

25 AP

CAT.A

>1.05

X3

�.100.4

0.70.80.9

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1020

30 102030

102030

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n



1.15.4 Electronic overcurrent release LCD ETU

General:• No auxiliary voltage is needed for release system• Current display• An illuminated LCD display indicates correct operation of microprocessor• Overload status (I > 1.05 x IR) is indicated by ”Overload” on the LCD display• Direct, user-friendly, menu-driven setting of the absolute values of the protection

parameters in Ampere values via keys• Integrated self-test function• Socket contact for tester• Communication connection to PROFIBUS-DP

Application: ETU40 for line protection, LSI

function, ETU40M motor/generator protection,

LSI/LSIN function

Overload protection IR = 0.4 to 1 x InTrip class tC = 2.5 to 30Thermal memory selectable, on/offShort-circuit protection (short-time delay)Isd = 1.5 to 10 x IR, tsd = 0 to 0.5 sI2t selectable, on/offShort-circuit protection (instantaneous) Ii = 1.25 to 11 x In (dependent on frame size)

Application: ETU42 for line protection, LSIG/

LSING function

Overload protection IR = 0.4 to 1 x InTime-lag class tR = 2.5 up to 30Thermal memory selectable, on/offShort-circuit protection (short-time delay)Isd = 1.5 to 10 x IR, tsd = 0 to 0.5 sI2t selectable, on/offShort-circuit protection (instantaneous)Ii = 1.25 up to 11 x In (dependent on frame size)Ground-fault protection:Measuring method no. 1: (GR) vectorial summa-tion of the currents in the three phases and neu-tral conductor (4-conductor system) I∆n = 0.4 to 1 x In, “CL”, “CM”, “CN” versionsMeasuring method no. 2: (GGND) direct measure-ment of the ground-fault current using a current converter, Ig = 0.4 to 1 x In, tg=0.1 to 0.5 s; “CM” versions

NSE0_00944

L

I

ESCL1=178; L2=181

L3=179; N=0

CAT.A =250An� ~ 25 CLn n� = �

NSE-00547

L

S

IG

NSE0_00697

ESCL1=178; L2=181

L3=179; N=0

CAT.A =250An� ~ 25 CLn n� = �

NSE-00547



MENU on the LCD display of the overcurrent release

The following languages are available:• English (default)• Spanish• German• French

Figure 1-10: Menu of the LCD display of the overcurrent release

Main menu Submenu 1.1 Submenu 1.1.1 Submenu 1.1.1

Default Screen(Basic Metering

and Setup)

View LineView LineProtection

View MotorView MotorProtection

View Protection

View System

View ZSI

View Setpoints

Change LineChange Line

Protection

Change MotorView MotorProtection

ChangeProtection

Change ZSI

ChangePassword

ChangeSetpoints

<Password>

Breaker Action

"Emergency"



1.15.5 Menu structure of the electronic trip unit LCD ETU

Figure 1-11: Detail of the menu for the overcurrent release LCD ETU 40

DEFAULT SCREEN

VIEW SETPOINTS

LAST TRIP STATUS

CHANGE SETPOINTS

ENTER PASSWORD

LAST TRIP PHASE

TOP OF LIST

TRIP TIMEdd/mm/yy h:m

PHASE CURRENTS

BOTTOM OF LIST

BREAKER ACTION

CHANGE PROTECTION

TOP OF LIST

CHANGE ZSI ( OPTION )

CHANGE COM ADDRESS

BOTTOM OF LIST

SELECT LANGUAGE

VIEW COMM ADDRESS

VIEW PROTECTION

VIEW SYSTEM

VIEW ZSI ( OPTION)

BOTTOM OF LIST

INITIATETRIP

INITIATE TRIP IN 1 SECOND


INITIATE TRIP ACTION STARTED

CIRCUIT BREAKER TRIPS

ONLY IF COM10 IS CONNECTED.

ZSI TEST

TEST ZSI 1 SECOND PULSE

TEST ZSI 10 SECOND PULSE

TOP OF LIST

INITIATEACTION

= YES

= NO

DATA

DATA

DATA

DATA

DATA

DATA

DATA

DATA

DEFAULT SCREEN

BOTTOM OF LIST

LSI / TRIP UNIT

INITIATEACTION

= YES

= NO

TEST ZSI ACTION STARTED

CHANGE PASSWORD DATA

OPTION -

= COM10



Figure 1-12: Example: Changing the type of protection of the overcurrent release LCD ETU 40

TOP OF LIST

CH

AN

GE

PR

OT

EC

TIO

N

TOP OF LIST

CHANGE SAVED

CHANGE NOT SAVED

CONTINUOUS AMPS SETTING 100 AMP


CONTINUOUS AMPS

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

LONG TIME DELAY SETTING 2.5 SEC

LONG TIME DELAY SETTING 30 SEC

LONG TIME DELAY

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

SHORT TIME DELAY OFF

SHORT TIME DELAY ON

SHORT TIME

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

SHORT TIME PICKUP = 150 A

SHORT TIME PICKUP = 1000 A

SHORT TIME PICKUP

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

SHORT TIME DELAY SETTING .100 SEC

SHORT TIME DELAY SETTING .500 SEC

SHORT TIME DELAY

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

SHORT TIME MODE FIXED

SHORT TIME MODE (I^2)T

SHORT TIME MODE

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

INSTANTANEOUS CURRENT = 312 AMPS


IOC AMPS

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

THERMAL MEMORY IS OFF

THERMAL MEMORY IS ON

THERMAL MEMORY

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

PREALARM IS OFF

PREALARM IS ON

PREALARM ENABLE

SAVE CHANGES ?

=YES

=NO

DATA

BOTTOM OF LIST

CHANGE SAVED

CHANGE NOT SAVED

PREALARM SET AT 80 AMPS


PREALARM

SAVE CHANGES ?

=YES

=NO

DATA



Figure 1-13: Detail of the menu for the overcurrent release LCD ETU 40 M

DEFAULT SCREEN

VIEW SETPOINTS

LAST TRIP STATUS

CHANGE SET POINTS

ENTER PASSWORD

LAST TRIP PHASE

TOP OF LIST

TRIP TIMEdd/mm/yy h:m

PHASE CURRENTS

BOTTOM OF LIST

BREAKER ACTION

CHANGE PROTECTION

TOP OF LIST

CHANGE COM ADDRESS

BOTTOM OF LIST

CHANGE PASSWORD

VIEW COM ADDRESS

VIEW PROTECTION

VIEW SYSTEM

BOTTOM OF LIST

INITIATE TRIP



INITIATE TRIP ACTION STARTED

�

CIRCUIT BREAKER TRIPS

ONLY IF COM10 IS CONNECTED.

TOP OF LIST

INITIATEACTION

= YES

= NO

DATA

DATA

DATA

DATA

DATA

DATA

DATA

DEFAULT SCREEN

BOTTOM OF LIST

MOTOR PROTECTION TRIP UNIT

SELECTLANGUAGE

OPTION -

= COM10



Figure 1-14: Example: Changing the type of protection of the overcurrent release LCD ETU 40 M

TOP OF LIST

CH

AN

GE

PR

OT

EC

TIO

N

TOP OF LIST

CHANGE SAVED

CHANGE NOT SAVED



CONTINUOUS AMPS

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

TRIP CLASS SETTING = 5

TRIP CLASS SETTING = 30

TRIP CLASS

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED



IOC AMPS

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

UNBALANCE AMPS SET TO 5 %

UNBALANCE AMPS SET TO 50 %

UNBALANCE

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

THERMAL MEMORY IS OFF

THERMAL MEMORY IS ON

THERMAL MEMORY

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

PREALARM IS ON

PREALARM IS OFF

PREALARM ENABLE

SAVE CHANGES ?

=YES

=NO

DATA

BOTTOM OF LIST

CHANGE SAVED

CHANGE NOT SAVED



PREALARM

SAVE CHANGES ?

=YES

=NO

DATA

CHANGE SAVED

CHANGE NOT SAVED

BRKR POSITION SW INSTALLED

BRKR POSITION SW NOT INSTALLED

INSTALL BREAKER POSITION SWITCH

SAVE CHANGES ?

=YES

=NO

DATA



1.15.6 Commissioning

The overcurrent release must be activated in order to parameterize it. A mini-mum load current of approx. 20% of the respective rated current ‘In’ of the cir-cuit-breaker is required.

The “LCD ETU” release is preset during production with the maximum settings for the overload release and the short-circuit release. This means that activation, and hence parameterization, is possible when a load is connected with a mini-mum current of at least 20% of the respective rated current ‘In’.Changing the parameters for the overload and short-circuit releases during oper-ation to a value under the present operating value causes instantaneous trip-ping.

If this minimum load current is not available, the required auxiliary power can be supplied using the 3VL9000-8AK00 hand-held tester. The release in circuit-breakers with communication capabilities is supplied with power by the COM10.

Note:

The hand-held tester can be borrowed from the Instrument Center (SIRENT) in Erlangen (Germany):

Address of SIRENT Rentals, Sales and Service. Rental and sales of tools and measuring and test devices:

SIEMENS AGSIRENT Rentals, Sales and ServiceI&S IS 3 SCE ITCGünther-Scharowsky-Str. 291058 Erlangen, GermanyTel. +49 (0) 9131-7-33310Fax. +49 (0) [email protected] http://intranet.siemens.de/sirent

The conditions for borrowing these devices can be viewed by entering the device number “S7P460” of the Instrument Center.

1.15.7 Overcurrent release system - functions overview

L LTD → Long-time delay Overload protection

S STD → Long-time delay Short-circuit protection (short-time delay)

I INST → Instantaneous Instantaneous short-circuit protection

G GF → Ground fault Ground fault protection

N N → Neutral Neutral conductor protection

Labeling overview

TM → Thermomagnetic overcurrent release

ETU → Electronic overcurrent release

LCD ETU → Electronic overcurrent release with LCD display



1.16 Ground fault protection

Description

The ground-fault release “G” detects fault currents which flows into the ground and could cause fires in the system. Several circuit-breakers connected in series can be given time-graded discrimination by means of the adjustable delay time. The following measurement methods can be used to detect neutral conductor and ground-fault currents:

1.16.1 Measurement method 1: Vectorial summation

Ground-fault detection in balanced systems

The three phase currents are evaluated using vectorial summation

Ground-fault detection in unbalanced systems

The neutral conductor current is measured directly. Only the ground-fault cur-rent is evaluated for the 3-pole circuit-breakers. In the case of the 4-pole circuit-breakers, the neutral conductor overload protection is also evaluated. The overcurrent release calculates the ground-fault current using the vectorial summation of the three phase currents and the neutral conductor current. The 4th current converter of the neutral conductor is installed internally in the case of 4-pole circuit-breakers.

Figure 1-15: Circuit-breaker in balanced system

Figure 1-16: 3-pole circuit-breaker, current converter in neutral conductor current

Figure 1-17: 4-pole circuit-breaker, current converter installed internally

L1L2L3

PE

3VL

NSE0_00685

L1L2L3N

PE

3VL

T5NSE0_00686

L1L2L3N

PE

3VL

NSE0_00687



Measurement method 2: Direct detection of the ground-fault current via a current

transformer at the grounded star point of the transformer

The current converter is installed directly at the grounded star point of the trans-former.

1.17 Rating plate and identification number

Figure 1-19: Circuit-breaker – Labeling and control elements

Figure 1-18: 3-pole circuit-breaker, current transformer at the grounded star point of the transformer

L1L2L3

3VL

T6

PE

N

NSE0_00688

Accessory cover(removable)

Standards

Switching capacity

Test button

Reference temperature

Overcurrent release type TM

Overcurrentsetting

Catalog no.(MRPD)

Accessoryidentification

Switching capacity

Circuit-breaker type

Frame sizes

Toggle handle with 3positions

Short-circuitrelease/setting

(Thermomagnetic)

In Nominal current of thecircuit-breaker



1.17.1 MRPD system overview

(N = numerical value, A = alphanumerical value)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

3 V L N N N N N A A N N N A A N

Frame size

Version(ANSI/UL - IEC)

Rated current

Breaking capacity

Overcurrent release

Number of poles

Type of install. and connections

Voltage & under-volt. release

Auxiliary current and alarm switch

Table 1-16: Order No. scheme (MRPD) for 3VL components


Mounting 2


Mounting

2.1 Overview

The SENTRON VL circuit-breakers are available in fixed mounted, plug-in or withdrawable versions, with either three or four poles.

2.2 Fixed mounted versions

Circuit-breaker type Fixed Plug-inWithdraw-

able

VL 160X x x –

VL 160 x x x

VL 250 x x x

VL 400 x x x

VL 630 x x x

VL 800 x – x

VL 1250 x – x

VL 1600 x – x

Table 2-1: Overview of the types of installation

Figure 2-1: Connection on the front of the mounting plate

Figure 2-2: Connection on the back of the mounting plate

SENTRON VL circuit-break-ers can be directly con-nected to the mounting plate. If busbars or terminals are used to connect the cir-cuit-breaker on the back of the mounting plate, the appropriate safety clear-ances must be observed (see Chapter 1.5).

Figure 2-3: Connection on the front of the mounting rail

Siemens SENTRON VL cir-cuit-breakers can be mounted directly onto mounting rails supplied by the customer. The appropri-ate safety clearances must be observed.

Figure 2-4: Connection on the front

Figure 2-5: Connection on the back

Busbars and cables can be directly connected to the front of busbar extensions or to bolts for connections on the back. If using straight busbar extensions, it is rec-ommended to use terminal covers or phase barriers.


Mounting

2.3 Plug-in versions

2.4 Withdrawable versions

Connections:

Figure 2-6: Connection on the front of the mounting plate

Figure 2-7: Connection on the back of the mounting plate

Plug-in sockets with pad-type terminals on the front or rear are available for di-rectly connecting cables and busbars. The plug-in socket is directly attached to the mounting plate or mounting rails supplied by the custom-er.

Figure 2-8: Connection on the front of the mounting rails

Figure 2-9: Connection on the back of the mounting rails

The appropriate safety clear-ances must be observed. Terminal covers and phase barriers are available for con-necting the circuit-breaker to the front of the connecting bars. A circuit-breaker in the “ON” position cannot be removed from the plug-in socket. The circuit-breaker will switch to the “tripped” position if attempts are made to remove it while it is in the “ON” position.

Figure 2-10: Connection on the front of the withdrawable version

Figure 2-11: Connection on the back of the withdrawable version

SENTRON VL circuit-break-ers may be used as with-drawable devices. They may be connected on either the front or the back. Safety cov-ers are provided and re-quired for final installation.


Mounting

Positions:

In the connected position the circuit-breaker is completely engaged, and all con-tacts - supply, outgoing and auxiliary contacts - are connected to the guide frame. The circuit-breaker is ready for operation.A safety interlock prevents the circuit-breaker from being removed when it is switched on. The safety interlock causes the circuit-breaker to switch off so that the arc which occurs inside the circuit-breaker when current flows can be extin-guished. The circuit-breaker can be installed in and removed from the guide frame when it is in the removable position.

2.5 Mounting and safety clearances

2.5.1 Mounting/installation

All SENTRON VL circuit-breakers can be mounted in the shown positions:

Figure 2-12: Connected position Figure 2-13: Disconnected position

Figure 2-14: Removable position

Figure 2-15: Mounting/installation

90° 90°90°90°90 ° 90 ° 90 ° 30 °


Mounting

2.5.2 Safety clearances:

During a short circuit interruption, high temperatures, ionized gases and high pressures are present in and above the arc chutes of the circuit-breaker.

Safety clearances are required to:• allow the pressure to be distributed• prevent fire or damage caused by any escaped ionized gases• prevent a short circuit to grounded sections• prevent arcing or short-circuit currents to live sections

Definition of the permitted safety clearances in [mm] betweenA: circuit-breaker and current paths (uninsulated and grounded metal)B: circuit-breaker phase terminal and lower panelC: side of circuit-breaker and side panels (uninsulated and grounded metal)D: circuit-breaker and non-conductive parts with at least 3 mm thick insulation (insulator, insulated bar, painted plate)

Figure 2-16: Safety clearances:

Permitted safety clearances according to IEC 60947

Circuit-

breaker

type

Switching

capacity

A

≤ 415 V

A

>415 - 690 V

B

≤ 690 V

C

≤ 690 V

D

≤ 690 V

with or with-out covers

without cov-ers

with covers

VL160X Standard High

35 mm 70 mm 35 mm 25 mm 25 mm 35 mm

VL160 Standard HighVery high

50 mm 100 mm 50 mm 25 mm 25 mm 35 mm


50 mm 100 mm 50 mm 25 mm 25 mm 35 mm


50 mm 100 mm 50 mm 25 mm 25 mm 35 mm


50 mm 100 mm 50 mm 25 mm 25 mm 35 mm


50 mm 100 mm 50 mm 25 mm 25 mm 35 mm


70 mm 100 mm 70 mm 30 mm 30 mm 50 mm


100 mm 100 mm 100 mm 100 mm 30 mm 100 mm

C

A

DB


Mounting

If uninsulated conductors are connected to terminals 1, 3, 5 and 7, they must be insulated from one another. This can be achieved using phase barriers or termi-nal covers.Terminal covers should be used for the main terminals at voltages of ≥ 600 V AC or ≥ 500 V DC.

Minimum clearance between two horizontally or vertically installed circuit-breakers.

Ensure that the busbar or cable connection does not reduce the air insulation distance. The permissible clearance between two circuit-breakers applies for both fixed mounted and plug-in versions. Some accessories may increase the width of the circuit-breaker. Refer to outline drawings.

The clearance between the terminal and the grounded metal must be G ≥ 12 mm.If the clearance to ground G < 12 mm, live parts must be insulated or a suitable barrier must be installed.

Caution Depending on the application, appropriate air and creepage distances must be observed, e.g. see IEC 60439-1.

Figure 2-17: Minimum clearance between two horizontally or vertically installed circuit-breakers.

Figure 2-18: Minimum clearance between the circuit-breaker and metal

E=0


Mounting

2.5.3 Safety clearances between circuit-breakers

Minimum clearance between two circuit-breakers which are installed above one another with different kinds of connections

The clearances given in the table are necessary to enable any ionized gasses that arise during a short-circuit to disperse.

A Connection on the front with cable, directB Connection on the front with cable lugC Connection on the front with pad-type terminalD Connection on the back with plug-in socket or busbar terminals

Figure 2-19: Table of different connection types

Circuit-breaker

type

VL160X VL160 VL250 VL400 VL630 VL800 VL1250 VL1600

Switching capac-tity

NH NHL NHL

A≤ 690 V

160 mm 200 mm

Table 2-2: Safety clearances between circuit-breakers

A B C D

Insulation InsulationInsulationBusbar


Mounting

2.5.4 Mounting cables and busbars

SENTRON VL molded-case circuit-breaker can be connected using cables, flexi-ble copper bars or busbars. Either copper or aluminum can be used.Thermal and electrodynamic loads affect these conductors if a short circuit occurs. In order to avoid dangerous effects, it is necessary to size them properly and to correctly ground them.The diagrams and tables below show the recommended maximum clearance between the circuit-breaker and the first support.

This table applies for all switching capacities

Figure 2-20: Mounting using a cable connection Figure 2-21: Mounting using busbars

Support dimen-

sions

VL160X VL160 VL250 VL400 VL630 VL800 VL1250 VL1600

A cable mm 100 100 130 150 300

B cable mm 400 400 400 400 600

C bar mm 250

Table 2-3: Recommended cable mounting clearances

A

B

C


Mounting

2.6 Overview of cable and busbar mounting methods

2.6.1 Rated operational voltage: Ue ≤ 600 V AC/500 V DC

(data about switching capacity Icu is based on 400/415 V AC)

Circuit-breaker dimensions VL160X VL160 VL250 VL400 VL630

Switching capacity for Ue ≤ 600 V AC/500 V DC Icu max Icu max Icu max Icu max Icu max

• Directly mounted cable• Insulated up to the circuit-breakerAccessories:

• none

70 kA 100 kA 100 kA 100 kA 100 kA

• Cable with cable lug• Insulation 8 mm above the phase barrierAccessories:

• Phase barriers• Weitkowitz cable lug• Connection with screw-type terminals

70 kA 100 kA 100 kA 100 kA 50 kA

• Cable with cable lug• Front connecting bars, standard• Insulation 8 mm above the phase barrierAccessories:

• Phase barriers• Connection with screw-type terminals• Front connecting bars, standard

70 kA 100 kA 100 kA 100 kA 50 kA

Table 2-4: Connection types (for Ue ≤ 600 V AC/500 V DC)

��

�8 m

m


Mounting

• Cable with cable lug• Front connecting bars, increased

pole clearance• Insulation 8 mm above the phase barrierAccessories:

• Phase barriers• Connection with screw-type terminals• Front connecting bars, increased

70 kA 100 kA 100 kA 100 kA 50 kA

• Connecting bars, directly mounted• Without insulationAccessories:

• Phase barriers• Connection with screw-type terminals

40 kA 40 kA 40 kA 45 kA 50 kA

• Connecting bars, directly mounted• With extended connection cover• Without insulationAccessories:

• Extended connection cover• Connection with screw-type terminals

70 kA 100 kA 100 kA 100 kA 100 kA

REVERSE

• Connecting bars, directly mounted• Incoming supply from the overcurrent release

side• Without insulationAccessories:


70 kA 100 kA 100 kA 100 kA 100 kA




�8 m

m


Mounting

• Connecting bars, directly mounted• Insulation 250 mm from the circuit-breakerAccessories:

• Connection with screw-type terminals

70 kA 100 kA 100 kA 100 kA 100 kA

• Connecting bars, directly mounted• Insulation 8 mm above the phase barrier and

250 mm from the circuit-breakerAccessories:


70 kA 100 kA 100 kA 100 kA 50 kA

• Connecting bars• Front connecting bars, standard• Insulation 8 mm above the phase barrier and


• Phase barriers• Connection with screw-type terminals• Front connecting bars, standard

70 kA 100 kA 100 kA 100 kA 50 kA

• Connecting bars• Front connecting bars, increased

pole clearance• Insulation 8 mm above the phase barrier and


• Phase barriers• Connection with screw-type terminals• Front connecting bars, increased

70 kA 100 kA 100 kA 100 kA 50 kA




��

8 m

m

250

mm

> 8 mm

> 8 mm


Mounting

• Connecting bars• Front connecting bars, standard• Insulation 250 mm from the circuit-breakerAccessories:

• Connection with screw-type terminals• Front connecting bars, standard

70 kA 100 kA 100 kA 100 kA 100 kA

• Connecting bars• Front connecting bars, standard• With extended connection cover• Without insulationAccessories:

• Extended connection cover• Connection with screw-type terminals• Front connecting bars, standard

70 kA 100 kA 100 kA 100 kA 100 kA





Mounting

2.6.2 Rated operational voltage: Ue ≤ 690 V AC/600 V DC

(Data about switching capacity Icu based on 690 V AC)



• Directly mounted cable• Insulated up to the circuit-breaker• Accessories:• Standard connection cover

12 kA 12 kA 12 kA 15 kA 35 kA

• Cable with cable lug• Weitkowitz cable lug• Front connecting bars, standard• Insulated up to the circuit-breaker• Accessories:• Standard connection cover• Connection with screw-type terminals• Front connecting bars, standard

12 kA 12 kA 12 kA 15 kA 35 kA

• Cable with cable lug• With extended connection cover• Accessories:• Extended connection cover• Connection with screw-type terminals

8 kA 12 kA 12 kA 15 kA –

• Connecting bars, directly mounted• Insulation 250 mm from the circuit-breaker• Accessories:• Standard connection cover• Connection with screw-type terminals

12 kA 12 kA 12 kA 15 kA 35 kA

Table 2-5: Connection types (for Ue <= 600 V AC/500 V DC)


Mounting

• Connecting bars• Front connecting bars, standard• Insulation 250 mm from the circuit-breaker• Accessories:• Standard connection cover• Connection with screw-type terminals• Front connecting bars, standard

12 kA 12 kA 12 kA 15 kA 35 kA

REVERSE

• Connecting bars, directly mounted• Incoming supply from the overcurrent release side• Without insulation• Accessories:• Phase barriers• Connection with screw-type terminals

12 kA 12 kA 12 kA 15 kA 35 kA



Table 2-5: Connection types (for Ue <= 600 V AC/500 V DC)


Connections 3


Connections

3.1 Main conductor connection of the SENTRON VL fixed mounted version

3.1.1 Network connection

SENTRON VL circuit-breakers can be supplied with power from above and below.

3.1.2 Multiple feed-in terminal for cable (copper/aluminum)

Figure 3-1: Supply types

Figure 3-2: Multiple feed-in terminals

Figure 3-3: Multiple feed-in terminal applica-tion

These multiple feed-in terminals for the in-coming supply and outgoing feeders con-sist of an aluminum body with tin plating to prevent oxidation. Both aluminum or cop-per cables may be used. Only one conduc-tor is permitted per terminal. Multiple feed-in terminals are available for the SENTRON VL 160X to VL 1250 circuit-breakers. Additional screw-type terminals are required for the SENTRON VL 160X and VL 160 circuit-breakers.

VL160X/

VL160

VL250 VL400 VL400 VL630 VL800 VL1250

Stranded cable cross section (mm2)

Al Cu

10-9510-95

50-24050-240

120-400 95-240

50-120 50-120

50-240 50-240

50-240 50-240

120-240 120-240

Cable connection possibilities

1 1 1 2 2 3 4

Torque Nm 16-2025-4550-95

6 914

25-3550-185

14 31

95-120150-400

31

56

31 34 42 42

Tool (hex wrench) 4 8 12 8 8 8 8

Fixing screwTorque

Nm – 13 15 15 15 15 24

Tool (Allen key)* – 4 6 6 6 8 8

* For the fixing screws of the connection pieces

RCD RCD

3VL 3VL 3VL 3VL

Network: Load: Network

NetworkNetworkLoad

Load

Load

Network: incoming supplyLoad: outgoing feeder


Connections

3.1.3 Box terminals (copper cables or bars)

3.1.4 Front connecting bars

Figure 3-4: Box termi-nals

Figure 3-5: Box termi-nals with solid/flexible copper bars or cables

The steel box terminal is supplied as stan-dard for use with the SENTRON VL160X and VL160 circuit-breakers. It is optional for VL250 to VL400. The terminal is designed to connect either a conductor or a solid/flexible copper cable.

Type of cable VL160X/VL160 VL250 VL400

Solid/stranded mm2 2.5-70 25-150 50-240

Stranded with end sleeves

mm2 2.5-50 25-120 50-185

Busbar dimensionsW x H x D

mm 12 x 10 x 19 17 x 10 x 24 25 x 10 x 46

Tightening torque mm 4/8 12 25

Tool (Allen key) 4 5 8

Figure 3-6: Front con-necting bars

Figure 3-7: Application of front connecting bars

Connecting bars are used to connect the circuit-breakers to busbars or cables in electrical systems. Front connecting bars are supplied with the SENTRON VL1600 as standard. Phase barriers are also included. Extended terminal covers can be fitted if necessary.Screw-type terminals with a metric thread (See 3.1.8.) are required for the SENTRON VL160X VL 160.


Connections

3.1.5 Front flared busbar extensions

3.1.6 Rear terminals

Di-

men-

sions

(mm)

VL160X/

VL160

VL250 VL400 VL630 VL800 VL1250/

VL1600

W 20 22 30,5 42 50 60

L 44.5 44.5 81.75 69.75 91.5 102.25

D 10 13 15 15 15 20

T 6.5 6.5 9.5 9.5 9.5 16

Ø 7 11 11 11 13 13

Figure 3-8: Flared bus-bar extensions

Figure 3-9: Application of flared busbar exten-sions

Front flared busbar extensions are used to establish busbar connections in switch-boards or other electrical equipment. Nor-mal application enables them to be matched to the next biggest circuit-breaker. See Table 1.1.4 above for the jumper dimen-sions. Phase barriers are also included in the scope of supply.Warning: Not compatible with extended terminal cover! Additional screw-type terminals are re-quired for the SENTRON VL160 VL and 160X.

VL160X/

VL160

VL250 VL400 VL630 VL800

P (mm) 44.5 44.5 63.5 76 76

Figure 3-10: Round ter-minals

Figure 3-11: Applica-tion of the round termi-nals

Rear terminals are used to adapt the SEN-TRON VL circuit-breakers to switchboards or other applications that require rear con-nection. They are bolted directly to a stan-dard SENTRON VL circuit-breaker without requiring any modification. Circuit-breakers mounted in switchboards or other electrical equipment may be removed from the front by removing the fixing screw that connects the circuit-breaker to the terminal.


Connections

3.1.7 Rear flat busbar terminals

Thread

Round terminal

VL160X/

VL160

VL250 VL400

Short length (Ls)mm

54 54 56.5

Long length (Ll)mm 110 110 116

Thread M12 M12 M12

Pad-type terminal VL160X/VL160

VL250 VL400

Short length (Ls)mm

51.5 51.5 56

Long length (Ll)mm 108.5 108.5 116

Bore Ø 11 11 11

W/W/T 25/25/4 25/25/4 28/28/8

Figure 3-12: Flat bus-bar terminal

Figure 3-13: Applica-tion of flat busbar ter-minals

Rear flat busbar terminals are used to adapt SENTRON VL630 to VL1600 circuit-break-ers to switchboards or other applications that require rear connection. The rear flat busbar terminals are bolted di-rectly to a standard SENTRON VL circuit-breaker without requiring any modification. A vertical or horizontal connection is estab-lished depending on the way the busbar terminals are mounted to the rear of the circuit-breaker. Circuit-breakers mounted in switchboards or other electrical equipment using rear flat busbar terminals may be re-moved from the front by removing the fix-ing screw that connects the circuit-breaker to the busbar.

mm VL630 VL800 VL1250 VL1600

W 32 50 50 60

L 66.5 159 159 178

Ø D 11 13 (2x) 13 (2x) 13 (2x)

Spanner opening 6 6 6 18

TorqueFixing screw

15 15 15 30


Connections

3.1.8 Connection with screw-type terminals

3.1.9 Connection with cable lugs

Cable lugs (ring cable lugs) are used to connect the cables to the terminals of the circuit-breaker.Weitkowitz cable lugs with a narrow flange are recommended (VL1 to VL4).

Figure 3-14: Connection with screw-type termi-nal

Figure 3-15: Establish-ing a connection with a screw-type terminal

The screw-type terminal with metric thread slides onto the incoming and outgoing ter-minal of the SENTRON VL circuit-breaker and acts as a threaded adapter for connect-ing busbars and cable lugs. The customer is responsible for the provision of screws and washers for the terminals and busbars if the size specified below is exceeded. Screw-type terminals are supplied for use with the SENTRON VL250 to VL1250 as standard.

Circuit-

breaker

VL160X VL160 VL250 VL400 VL630 VL800 VL1250

Screw

Customer busbar T

mm

M5 x 20

1-7

M5 x 20

1-7

M8 x 20

1-7

M8 x 20

3-10

M6 x 30(2x)5-10

M8 x 30(2x)

10-15

M8 x 40(2x)

15-20

Max. torque Nm 4.5 4.5 10 15 15 24 24

BusbardmaxWmax mm

mm619

924

924

1032

1042

1350

1350

Figure 3-16: Cable lug Figure 3-17: Applica-tion of cable lug no. 1

Figure 3-18: Applica-tion of cable lug no. 2

Figure 3-19: Applica-tion of cable lug no. 3


Connections

3.2 Main conductor connection for plug-in and withdrawable versions

3.2.1 Plug-in socket: Connection on the front with busbar extensions

3.2.2 Plug-in socket: Connection on the back with flat busbar terminals

Figure 3-20: Plug-in socket

Figure 3-21: Plug-in socket with front bus-bar extensions (busbar covers are not shown)

Plug-in sockets simplify the installation and removal of SENTRON VL circuit-breakers. The circuit-breaker has been developed to-gether with the plug-in socket such that they cannot be separated when the circuit-breaker is in the “ON” position. Busbars or cables may be connected on the front. A terminal cover is provided and should be used for both the incoming and outgoing ends. An additional phase barrier can be added to provide insulation between the terminals (see Section 4.10 and Section 4.11). When the circuit-breaker is in the connected position, the primary voltage is supplied using special multiple clamping contacts in the guide frame.

Figure 3-22: Plug-in socket

Figure 3-23: Plug-in socket with rear flat busbar terminals

Busbars and cables can be connected on the back. Vertical and horizontal connec-tions are possible depending on the config-uration of the busbar terminal.


Connections

3.2.3 Withdrawable version: Connection on the front with busbar extensions

3.2.4 Withdrawable version: Connection on the back with flat busbar terminals

Figure 3-24: Withdraw-able version with front busbar extensions and terminal covers

Figure 3-25: Withdraw-able version with front busbar extensions

The withdrawable version enables the in-sertion and removal of the SENTRON VL circuit-breaker without requiring incoming or outgoing cables or busbars to be discon-nected. A special operating mechanism, which is attached to the stationary assem-bly, is used to insert or remove the circuit-breaker. A mechanical interlock prevents the circuit-breaker from being moved from the connected position to the disconnected position when it is switched on. The circuit-breaker will trip before the multiple clamp-ing contacts between the circuit-breaker and the guide frame open. A locking device with padlock is provided on the stationary arm of the withdrawable unit. The cus-tomer can lock the circuit-breaker in either the withdrawn or connected position.

Figure 3-26: Withdraw-able version with rear flat busbar terminals

Figure 3-27: Withdraw-able version with rear flat busbar terminals

The bus configuration is arranged for hori-zontal connections when the withdrawable assembly with rear flat busbar terminals is used. A separate kit is available for circuit-breakers up to and including VL250 for ver-tical connections.


Connections

3.3 Location and position of the terminals

Figure 3-28: Location of the terminals

Figure 3-29: Location of the terminals

Plug-in socket

Rotary

Motorized operating mechanism

X21

X20

X5, X6, X7

X22mechanism

PortabletesterNeutral

sensor

X24

X3

X12X13

X18, X19

X2 X1X4

RCD module

X14

X14

X17 X15

X16


Connections

3.3.1 Description of the terminals

Number

Where are the circuit-

breakers/

accessories?

Description

X1 Right-hand acces-sory compartment of the circuit-breaker

Shunt release and Undervoltage releaseAuxiliary & alarm switchesVL160X to VL400VL630 to VL1600

X1.1 + X1.2

X1.1 to X1.6X1.1 to X1.8

X2 Left accessory com-partment of the cir-cuit-breaker

Auxiliary & alarm switchesVL160X to VL400VL630 to VL1600

X2.1 to X2.6X2.1 to X2.8

X3 Connection socket to ETU/LCD

I/O connection for portable tester or communi-cations adapter.

X4 Left accessory com-partment of the cir-cuit-breaker (only for 4-pole versions)

Auxiliary & alarm switchesVL160X to VL400VL630 to VL1600

X4.1 to X4.6X4.1 to X4.8

X5 Auxiliary current plug-in connection for plug-in socket/guide frame

Motorized operating mechanismRemote tripping RCD moduleIf no motorized operating mechanism is avail-able: Remote tripping display RCD module

X5.1 to X5.5X5.6 to X5.8

X5.1 to X5.3

X6 Auxiliary current plug-in connection for plug-in socket/guide frame

Shunt release or Undervoltage releaseAuxiliary & alarm switchesIf no motorized operating mechanism is avail-able:Remote tripping display RCD module

X6.1 to X6.2

X6.3 to X6.8

X6.6 to X6.8

X7 Auxiliary current plug-in connection for plug-in socket / guide frame

VL400 to VL1600 onlyAuxiliary & alarm switches X7.1 to X7.8

X8 Reserved

X9 Reserved

X10 (plug) Reserved

X11 (plug) Reserved

X12 RCD module VL160 to VL400 only Remote tripping display X12.1 to X12.3

X13 RCD module VL160 to VL400 only Remote Control X13.1 to X13.3

X14 COM 10 (Profibus module)

X15 COM 10 (Profibus connection)

X16 LCD ETU (COM 10 connection)

X17 COM 10 (circuit-breaker connection)

X18, X19 Hand-held tester for ETU/LCD ETU

Reserved

X20 Motor X20.1 N/L- voltage supplyX20.2 ON (electr. ON)X20.3 OFF (electr. OFF)X20.4 L1/L+ voltage supplyX20.5 protective conductor

X21 Rotary mechanismLeading auxiliary con-tacts(Connecting cables)

Leading NO contacts NC/NOX21.1 to X21.3 switch AX21.4 to X21.6 switch BLeading NC contacts NC/NOX21.7 to X21.9 switch AX21.10 to X21.12 switch B


Connections

3.4 Conversion tables

3.4.1 Metric/US-American cross sections

Metric cross sections according to VDE (Verband Deutscher Elektringenieure: Association of German Electrical Engineers) (mm2) ↔. Conductor cross sec-tions according to AWG (American Wire Gauge) and MCM (Thousand Circular Mils)

X22 Plug-in socketWithdrawable device Position switch

Position signaling contactsX22.1 to X22.3 switch AX22.4 to X22.6 switch B

AWG/MCM mm2

AW

G

20 0.52

18 0.82

16 1.3

14 2.1

12 3.3

10 5.3

8 8.4

6 13.3

4 21.2

2 33.6

1 42.4

1/0 53.5

2/0 67.4

3/0 85.0

4/0 107.2

MC

M

250 126

300 152

350 177

400 203

500 253

600 304

800 405

1000 507

1500 760

2000 1010

Number

Where are the circuit-

breakers/

accessories?

Description


Connections

3.4.2 Other conversions

Power

1 kilowatt (kW) = 1.341 horsepower (hp)

1 horsepower (hp) = 0.7457 kilowatt (kW)

Length

1 inch (in.) = 25.4 millimeters (mm)

1 centimeter (cm) = 0.3937 inches (in.)

Weight

1 ounce (Oz.) = 28.35 grams (g)

1 Pound (lb.) = 0.454 kilograms (kg)

1 kilogram (kg) = 2.205 pounds (lb.)

Temperature

100 degrees Centigrade (°C) = 212 degrees Fahrenheit (°F)

80 = 176

60 = 140

40 = 104

20 = 68

0 = 32

-5 = 23

-10 = 14

-15 = 5

-20 = -4

-25 = -13

-30 = -22

Torque

1 Newton-meter (Nm) = 8.85 pound-inches (lb.in.)


Design and Operating Principle of the Circuit-breakers 4


Design and Operating Principle of the Circuit-breakers

4.1 Design

All SENTRON VL circuit-breakers possess a trip-free mechanism which enables a tripping event, even if the operating mechanism is blocked or manually held in the "ON" position. The contacts are opened and closed using a toggle handle located in the middle. This is located on the front of all of the circuit-breakers.All SENTRON VL circuit-breakers are "joint trip units". This means all contacts open or close simultaneously when the circuit-breaker toggle handle is moved from”OFF” to ”ON” or from ”ON” to ”OFF”, as well as when the trip mecha-nism is activated by either an overcurrent event or the use of an auxiliary release (shunt or undervoltage release).

VL 160X circuit-breakers

The most important components of the VL160X circuit-breaker are the three conducting paths with incoming and outgoing terminals. The fixed and move-able contacts are configured in such a manner that a magnetic repulsion of the contacts is produced. In conjunction with the arc quenching chutes, a dynamic impedance is generated that causes current limitation by reducing the damag-ing effects of I2t and the Ip energy created during short circuits. The overcurrent release is a thermomagnetic device that is installed as stan-dard. It is equipped with a permanently set short-circuit release and either a per-manently set or adjustable overload release in every pole.A double insulated accessory compartment for installing auxiliary and alarm switches, as well as shunt and undervoltage releases, is located to the right and left of the central toggle handle of every SENTRON VL circuit-breaker.

VL160 to VL630 circuit-breakers

The arrangement of the conducting paths, contact configuration and the breaker mechanism of the VL160 to VL630 circuit-breakers is identical to the VL160X cir-cuit-breaker. The difference in design is related to the overcurrent release.• The overcurrent releases are available in both a thermomagnetic and an electronic ver-

sion.• The overcurrent releases can be installed or interchanged on site without requiring any

special tools.• The thermomagnetic overcurrent release are available with adjustable overload and

short-circuit releases.

VL800 to VL1600 circuit-breakers

As with the VL160X to VL630 circuit-breakers, the arrangements of the conduct-ing paths and operating mechanisms are identical.However, the VL800 to VL1600 circuit-breakers are only available with an elec-tronic overcurrent release. As with all electronic overcurrent releases for the Siemens SENTRON VL circuit-breakers, the current converters (one per phase) are located within the overcurrent release housing. They supply a signal propor-tional to the load current to the electronic overcurrent release system.All of the SENTRON VL circuit-breakers with electronic releases measure the actual RMS current. This type of measurement assures the most accurate means of measuring currents in electrical distributions systems with very large numbers of harmonics.



Overcurrent release systems

1. Overcurrent release of the SENTRON VL160X to VL630 circuit-breakers, thermomag-

netic, TM.

The overcurrent and short-circuit releases function with bimetals and mag-netic coils. They are available with fixed or adjustable settings. The 4-pole circuit-breakers for line protection can be supplied with overcur-rent releases in all 4 poles or without an overcurrent release in the 4th (N) pole. Starting with 100 A, the releases in the 4th (N) pole are set to 60% of the current in the 3 main conducting paths to ensure safe protection of the neutral conductors with reduced cross-sections. These circuit-breakers for starter combination applications are usually com-bined with motor contactors and corresponding overload relays. The circuit-breakers have an integrated self-protection against short-circuits, meaning that no back-up fuses are required. These circuit-breakers do not have any overload protection. 4-pole circuit-breakers do not have a short-cir-cuit release in the 4th (N) pole.

2. Overcurrent release of the SENTRON VL160 to VL1600 circuit-breakers,

electronic, ETU/LCD ETU

The electronic overcurrent release system consists of:• Current converters• Evaluation electronics with microprocessor• Closing solenoid

The left-hand accessory compartment of the SENTRON VL160 and VL250 contains the closing solenoid.No auxiliary voltage is required for the release system. A minimum load current of approx. 20% of the respective rated current of the circuit-breaker, In, is required to activate the microprocessor release.A closing solenoid is located at the output of the electronic overcurrent release module, which trips the circuit-breaker if an overload or short circuit occurs.

Figure 4-1: Internal view of MCCB

(1) Housing(2) Main terminals(3) Arc chute(4) Moveable contact arm(5) Breaker locking device(6) Overcurrent release

(1)

(2)

(3)

(4)

(6)(5)



4.2 Drives

4.2.1 Toggle handle

The basic version of the SENTRON VL circuit-breakers have a toggle handle as a drive, which also serves as a switching position indicator. In addition to “ON” and “OFF”, the position of “TRIPPED” is also indicated.The toggle handle moves to the “TRIPPED” position when the internal tripping mechanism is activated through an overcurrent event such as an overload or a short-circuit.The activation of an undervoltage release or shunt release will also cause the toggle handle to move to the ”TRIPPED” position.

Figure 4-2: Toggle handle in the “ON” position

The toggle handle must be returned to the “OFF/RESET” position before the circuit-breaker can be turned back on again. This enables the internal release mechanism to be reset.

Figure 4-3: Toggle handle positions

ON OFF TrippedRESET



4.2.2 Rotary mechanism on the front

Degree of protection

The rotary mechanism on the front provides degree of protection IP30.

Locking

Lockable in the OFF position with up to 3 padlocks.In addition, a safety lock can also be used.

Application

Standard application:Black knobGray indicator plate

Emergency Stop application:Red knobYellow indicator plate

Accessories

As an option, up to 4 changeover contacts may be used. Two contacts can be used as leading NO contacts and two contacts as leading NC contacts. These are equipped with 1.5 m long connection cables.

4.2.3 Door-coupling rotary operating mechanism

The door-coupling rotary operating mechanism is connected as follows:• Rotary direct drive on the front with shaft stub (without knob)• Shaft coupling• 300 mm extension shaft (600 mm optional, clip required)• Knob

Figure 4-4: Rotary mechanism

The rotary mechanism on the front is directly mounted onto the circuit-breaker. It converts the vertical move-ment of the toggle handle into a rotary motion.SENTRON VL circuit-breakers with rotary mechanism comply with the "Network disconnecting device" condi-tion of DIN VDE 0113.

Figure 4-5: Door-coupling rotary operating mechanism

Door-coupling rotary operating mecha-nisms are available for installation in control cabinets and distribution boards. SENTRON VL circuit-breakers with door-coupling rotary operating mechanisms comply with the "Network disconnect-ing device" condition of DIN VDE 0113.



Degree of protection

This device provides degree of protection IP65.

Locking

Lockable in the "OFF" position with up to 3 padlocks. In addition, a safety lock can also be used.

Application

Standard application:Black knobGray indicator plate

Emergency Stop application:Red knobYellow indicator plate

Accessories

As an option, up to 4 changeover contacts may be used. Two contacts can be used as leading NO contacts and two contacts as leading NC contacts. These are equipped with 1.5 m long connection cables.

Circuit-breaker

Knob can be locked with padlock, with masking

frame and display plate, actuator plate for shafts,

extension shaft (300 mm), coupling for extension

shaft

TypeRated

current

Drive witho

ut knobExtension shaft

Standard driveEmergency-

stop drive

Order No. Order No.

VL160X 16…160 3VL9300- 3HE00

8 x 8 mm

8UC6262-6BD22 8UC6272-8BD22VL160 50…160 " 8 x 8 mm

VL250 200…250 " 8 x 8 mm

VL400 200…400 3VL9400- 3HE00

12 x 12 mm

8UC6314-1BD44 8UC6324-3BD44

VL630 315…600 3VL9600- 3HE00

12 x 12 mm

VL800 320…800 " 12 x 12 mm

VL1250 400…1250 3VL9800- 3HE00

12 x 12 mm

VL1600 640…1600 " 12 x 12 mm

Table 4-1: Accessory overview



4.3 Leading auxiliary switch for switching on/off

Leading auxiliary switches (changeover contacts) are available as accessories for the door-coupling rotary operating mechanism and the rotary operating mecha-nism on the front.

4.3.1 Leading auxiliary switch for switching from OFF to ON (leading NO

contact)

Example application:

If the circuit-breaker is equipped with an undervoltage release and the leading auxiliary switches are installed in the rotary operating mechanism, the leading NO contacts allow the undervoltage release to be supplied with voltage before the main contacts can be closed.

4.3.2 Leading auxiliary switch for switching off (leading NC contact)

Example application:

For applications with thyristors, it is necessary to reset the power electronics of the static frequency changer before the main circuit is switched off. Circuit-breakers with leading auxiliary switches create a leading signal which enables the targeted resetting of the thyristor.

Figure 4-6: Rotary operating mechanism with leading auxiliary switches

The following versions are available:• Leading auxiliary switch for switch-

ing from ON to OFF.• Leading auxiliary switch for switch-

ing from OFF to ON.Each version of the leading auxiliary switch for switching on/off can be equipped with one or two changeover contacts. The auxiliary switch connection cables are 1.5 m long.

0 1 Leading auxiliary switch L1, L2, L3 ON, “S4“ S4 with rotary direct drive Circuit-breaker ON 0 1

closed

opened

1 0 Leading auxiliary switch L1, L2, L3 OFF, “S4“ S4 with rotary direct drive Circuit breaker OFF 1 0

closed

opened



4.3.3 Technical data

4.4 Locking devices

4.4.1 Locking device for the toggle handle

4.4.2 Safety lock for the rotary operating mechanism and the motorized

operating mechanism

A safety lock can be used for both the rotary operating mechanism and the motorized operating mechanism.The safety lock is used to lock the circuit-breaker in the OFF position. The key can only be removed when the circuit-breaker is in the OFF position. The key cannot be removed when the rotary operating mechanism or the motorized operating mechanism is in the ON position.Each safety lock is supplied with its own locking system as standard.

Technical data: Leading auxiliary switch for rotary mechanisms

VL160X- VL1600

Thermal rated current Ith [A] 2

Rated making capacity [A] 2 resistive (0.5 inductive)

Alternating current cos ϕ 0.7

Rated operational voltage [V] 230

Rated operational current [A] 2

Rated breaking capacity [A] 2 resistive (0.5 inductive)

Back-up fuses [A] 2

Table 4-2: Technical data for the leading auxiliary switch

Figure 4-7: Locking device for the toggle handle

The locking device for the toggle handle is designed to be easily attached to the circuit-breaker collar.This device allows the handle to be locked in the ”OFF” position.The locking device for the toggle handle can be installed in 3-pole and 4-pole cir-cuit-breakers. Up to 3 padlocks with shackle diameters ranging from 5 to 8 mm may be used. (Not for the VL160X with RCD module)



4.4.3 Mutual interlocking of two circuit-breakers (bowden wire) in the fixed

mounted, plug-in and withdrawable versions.

Figure 4-8: Rotary operating mechanism on the front

Figure 4-9: Stored energy operator for the VL250

Figure 4-10: Stored energy operator with memory for the VL630

Figure 4-11: With toggle handle Figure 4-12: With rotary operating mechanism



Figure 4-13: Possible mounting options

96

68.5112

52.585

69

7615

0.5

78 89

R>60 mm

Y

Y

X XN

SE

0089

6

Y

94

94

112

112

127

127

6615

1

6621

6

R>60 mm

Y

XX

NS

E00

897

NS

E00

898

NS

E0_

0123

9



Possible combinations

Two SENTRON VL circuit-breakers can be mutually mechanically interlocked using a bowden cable and the locking modules.Modules with the same dimensions or those with the dimensions specified above (e.g. VL250 and VL400) can be successfully locked together.The use of this accessory kit means that only one of the circuit-breakers is in the ”ON” position at any time. Fixed mounted and plug-in circuit-breakers use different locking modules, which are, however, compatible with each other. This enables both to be used in lock-ing circuits. Two circuit-breakers can be mounted side by side or one above each other. The distance between them depends on the length of the bowden cable and its min-imum bending radius. The cable comes in lengths of 0.5 m, 1.0 m and 1.5 m. The minimum bending radius of each cable is 60 mm. The length of the bowden cable must not be altered by the customer. The bowden cable has a mechanical endurance of 10,000 operations. Each bowden cable must be ordered separately.

Note:

Not possible in combination with the motorized operating mechanism.

3VL9300-8LA00

for the VL160X,VL160 and VL250

3VL9400-8LA00

for the VL4003VL9600-8LA00

for the VL630 and VL800

3VL9800-8LA00


3VL9300-8LA00 for the VL 160X, VL160 and VL250

3VL9400-8LA00

for the VL400

3VL9600-8LA00


3VL9800-8LA00




4.4.4 Mutual interlocking (rear interlocking modules) of two circuit-breakers in

the fixed mounted, plug-in and withdrawable versions.

The rear interlocking module enables the mutual mechanical interlocking of two SENTRON VL circuit-breakers with the same dimensions. The rear interlocking module is attached behind the circuit-breakers to the mounting plate supplied by the customer.A tappet on each end of the rocker automatically accesses the circuit-breaker through an opening in the mounting plate and the base of the circuit-breaker. The rear interlock module prevents both circuit-breakers from being in the ”ON” position at the same time.The rear interlock module can be used with fixed mounted, plug-in and with-drawable circuit-breakers. Cross wiring of internal accessories via the rear of the circuit-breaker is not pre-vented.This locking version is possible with all drive mechanism types (toggle handle, rotary operating mechanism and motorized operating mechanism).

Figure 4-14: Fixed mounted version Figure 4-15: Plug-in version

Figure 4-16: Fixed mounted version Figure 4-17: Plug-in version



4.5 Stored energy operator

Motorized operating mechanisms enable the circuit-breaker to be switched ON and OFF locally or by remote control. They are equipped with a locking device for padlocks (standard) and an (optional) locking device with safety lock to elec-trically and mechanically lock the operating mechanism. Motorized operating mechanisms can also be operated by hand. Two types of mechanisms are avail-able.

Stored energy operators for the VL160X-VL800• Stored energy operators are suitable for synchronization tasks.• The motor charges a spring-loaded mechanism (operator) and moves the SENTRON

VL toggle handle to the “OFF/RESET” position.• The spring-loaded mechanism (operator) discharges when it is actuated, quickly

switching the SENTRON VL toggle handle to the ”ON” position.• A change-over switch allows local (Manual) or remote (Auto) operation to be selected.• The manual actuator handle is located on the front of the drive cover.

Motorized operating mechanism for the VL1250-1600• The motor drives a mechanism which switches the SENTRON VL toggle handle to the

”ON” and ”OFF/RESET” positions. • The manual actuator handle is located on the front of the drive cover.• A change-over switch allows local (Manual) or remote (Auto) operation to be selected.

Figure 4-18: Stored energy operator



Description of the function of the stored energy operator:

Assumption: Supply voltage is applied

Status Actuation Display

The stored energy operator is "charged". The SENTRON VL toggle handle is in the “OFF/RESET” position.

Figure 4-19: The stored energy operator is charged("Charged"). The SENTRON VL toggle handle is in the”OFF/RESET” position.

Local operation: To switch on: Press the "ON" button. Remote operation:

To switch on: "ON" signal

The stored energy operator "dis-charges" and moves the SEN-TRON VL toggle handle to the "ON" position.

"ON/Discharged"

Figure 4-20: Display: Discharged stored energy operator

The stored energy operator is ”discharged”. The SENTRON VL toggle handle is in tripped posi-tion.

Figure 4-21: The stored energy operator is discharged("Discharged"). SENTRON VL tog-gle handle is in the ”ON” or tripped position

Local operation: To switch off: Press the "OFF" buttonRemote operation: To switch off: "OFF" signal

The SENTRON VL toggle handle moves to the "OFF" position. The motor "charges" the stored energy operator.

"OFF/Charged"

Figure 4-22: Display: Charged stored energy operator

The stored energy operator is ”discharged”. The SENTRON VL toggle handle is in tripped posi-tion.

Figure 4-23: The stored energy operator is discharged("Discharged"). SENTRON VL tog-gle handle is in the ”ON” or tripped position

Local operation:To switch off: Press the "OFF" buttonRemote operation:To switch off: "OFF" signal

The SENTRON VL toggle handle moves to the "RESET" position. The motor "charges" the stored energy operator.

"OFF/Charged"

Figure 4-24: Display: Charged stored energy operator



Figure 4-25: Stored energy operatorAutomatic (remote)/manual (local) change-over switch

Figure 4-26: Local/remote change-over switch

Local operation is not possible when the operating mode is set to Auto. The local operating control is deactivated. The man-ual clamping handle works when the drive is in the “ON/discharged” position. Only local operation is possible in the manual operating mode. Remote signals are blocked. The ”ON” button operates mechanically and releases the stored energy operator. The ”OFF” button operates the motor that charges the stored energy operator. Using an inter-nal mechanical locking device, the "OFF" button can be config-ured such that the SENTRON VL will trip when the button is pressed. This makes it possible to immediately trip the circuit-breaker. When this occurs, the toggle handle initially goes into the "tripped" position. Then the motor movement moves it into the "OFF/RESET" position.

Figure 4-27: Locking slide with padlock

Figure 4-28: Locking slide with padlock

The auto/manual change-over switch must be set to the man-ual operating mode in order to locally lock the circuit-breaker into the "OFF" position. Between 1 and 3 padlocks with shackle diameters ranging between 4 and 8 mm can be accommodated on the locking slide. The drive cover cannot be removed. Compatible for locking with the safety lock feature.




4.5.1 Technical data: Stored energy operator

Figure 4-29: Mechanical locking with safety lock

Figure 4-30: Mechanical locking with safety lock

The auto/manual change-over switch must be set to the man-ual operating mode in order to locally lock the circuit-breaker into the "OFF" position. The locking device with safety key prevents local and remote oper-ation. The key can only be removed in the locked switch position (“OFF”). The locking slide protrudes out of the drive cover to indicate that the drive is locked. The drive cover cannot be removed when it is locked. Compatible with the padlock feature.

TypeV

L1

60

X

VL

16

0

VL

25

0

VL

40

0

VL

63

0

VL

80

0

VL

12

50

VL

16

00

Synchronizable X X X X X X – –

Operating range V 0.85 - 1.1 US

Minimum command duration at Us ms 50

Total closing time ms <100 <5000

Break-time s <5

Re-closing after approximately s 1 50

Max. permissible switching frequency 1/h 120 60 30

Command duration ms Jog or pushbutton command

Electrical data

Power consumption VA 100, 200, 250, 250, 500

Rated control supply voltage US

50 - 60 Hz AC

V 48, 60, 110/127, 230/250

DC V 24, 48, 60, 110/127, 230/250

Fuse (time-lag)Circuit-breaker, C char.

AA

4, 4, 4, 2, 24, 4, 4, 2, 2




4.6 Undervoltage release

Undervoltage releases are installed in the right accessory compartment of the SENTRON VL circuit-breakers.

4.6.1 Technical data: Undervoltage release

Figure 4-31: Undervoltage release

The undervoltage release causes the circuit-breaker to trip when the voltage fails or falls to an operating level between 70 – 35% x US. Re-closure of the circuit-breaker contacts is only pos-sible once the voltage has reached a value of at least 85% x US.Undervoltage releases can be installed for electronic locking.

VL1

60X

VL1

60

VL2

50

VL40

0

VL6

30

VL80

0

VL125

0

VL1

60

0

Transformer operating voltage [V]

• Drop (circuit-breaker trips) 0.7 - 0.35 Us 0.7 - 0.35 Us

• Rise (circuit-breaker can be switched on) 0.85 - 1.10 Us 0.85 - 1.10 Us

Power consumption

• AC 50/60 Hz [VA]

110 - 127 V220 - 250 V

208 V277 V

380 - 415 V440 - 480 V500 - 525 V

600 V

1.51.51.82.11.61.8

2.052.4

1.12.12.21.62.02.32.93.4

• DC [W] 12 V24 V48 V60 V

110 - 127 V220 - 250 V

0.750.80.80.80.80.8

1.21.41.51.61.21.5

Max. opening time [ms] 50 80



4.7 Shunt release

4.7.1 Technical data: Shunt release

Figure 4-32: Shunt release

The shunt release is used to remotely trip the circuit-breaker. It is designed for short-time operation and is therefore equipped with an interrupt contact for self-protection. Shunt releases are installed in the right-hand accessory compartment of the SENTRON VL circuit-breakers.

Group 1 Group 2

VL1

60X

VL

160

VL

250

VL40

0

VL

630

VL80

0

VL125

0

VL1

60

0

Transformer operating voltage:

Rise (circuit-breaker trips)[V] 0.7 - 1.10 Us 0.7 - 1.10 Us

Power consumption

• AC 50/60 Hz [VA] 48 - 60 V110 - 127 V208 - 277 V380 - 600 V

158 - 200136 - 158274 - 350158 - 237

300 - 480302 - 353330 - 439243 - 384

• DC [W] 12 V24 V

48 - 60 V110 - 127 V220 - 250 V

110110

110 - 172220 - 25497 - 110

50360

500 - 820302 - 353348 - 397

Max. load duration [s] automatic interruption

Max. opening time [ms] 50

Fuse (time-lag)

Circuit-breaker,

C characteristics

[A]

[A]

4 (AC 48-60V, 110-127V, 208-277V)

2 (all others)

5



4.8 Auxiliary and alarm switches

Auxiliary and alarm switches are used to indicate the switching status of the cir-cuit-breaker. Auxiliary switches show the position of the main contact ("ON" or "OFF").Alarm switches transmit a signal when the circuit-breaker trips due to a short-circuit or overcurrent or when the shunt release, undervoltage release, test but-ton or RCD module trips.

Possible configuration of the insulated accessory compartment

Group 1 Group 2

VL160

X

VL16

0

VL25

0

VL4

00

VL63

0

VL8

00

VL1

250

VL160

0

Shunt release or undervoltage release, HS: Auxiliary switch, HS: Alarm switch (1 NO or 1 NC contact respectively)

Note: Maximum of 6 contact blocks (HS) per circuit-breaker VL160X to VL400Maximum of 6 contact blocks (HS) per circuit-breaker VL160X to VL400

U<

U<

U<

U<

U<

U<

U<

U<

N - 4th poleAccessory compartment

Max.3 HS

Max.3 HS

Max.2 HS +1 AS

Max.2 HS +1 AS

Max.3 HS

Max.3 HS

Max.3 HS

Max.3 HS

Max.4 HS

Max.4 HS

Max.4 HS

Max.4 HS

Max.3 HS

Max.2 HS +1 AS

Max.3 HS

Max.2 HS +1 AS

Max.3 HS

Max.2 HS +1 AS

Max.4 HS

Max.2 HS +2 AS

Max.4 HS

Max.2 HS +2 AS

Max.4 HS

Max.2 HS +2 AS

Max.4 HS

Max.2 HS +2 AS

Max.3 HS

Max.2 HS +1 AS

Max.3 HS

Max.2 HS +1 AS

Max.3 HS

Max.4 HS

Max.4 HS

Max.4 HS

Max.4 HS

Left-hand accessory compartment

Right-hand accessory compartment

VL160X mit RCD:Left-hand accessory compartment contains closing solenoid.

VL160/VL 250 with electronic overcurrent release (ETU or LCD ETU):Left-hand accessory compartment contains closing solenoid.

U<



4.8.1 Technical data: Auxiliary switch

Rated insulation voltage Ui

with degree of pollution according to IEC 60947-1• Elements with screw-type terminal

Class 3400 V

Rated impulse withstand voltage Uimp

• Screw-type terminal, spring-loaded terminal

6 kV

Conventional thermal current Ith 10 A

Rated operational current Ie

with rated operational voltage Ue

• Alternating current 50/60 Hz, AC-12 - Screw-type terminal

with Ue 24 V 48 V 110 V 230 V 400 V

Ie 10 A 10 A 10 A 10 A 10 A

• Alternating current 50/60 Hz, AC-15 - Screw-type terminal

with Ue 24 V 48 V 110 V 230 V 400 V

Ie 6 A 6 A 6 A 6 A 3 A

• Direct current, DC-12- Screw-type terminal

with Ue 24 V 48 V 110 V 230 V

Ie 10 A 5 A 2.5 A 1 A

• Direct current, DC-13- Screw-type terminal

with Ue 24 V 48 V 110 V 230 V

Ie 3 A 1.5 A 0.7 A 0.3 A

Contact stability

Test voltage/test current 5 V/1 mA

Short-circuit protection weld-freeaccording to IEC 60947-5-1 • DIAZED-fuse links, utilization category gL/gG • Miniature circuit-breaker with c characteristics

according to IEC 60898 (VDE 0641)

10 A TDz, 16 A Dz 10 A

Terminal cross section

• Screw-type terminal - finely stranded, with end sleeves according to DIN 46228 - solid - solid, with end sleeves according to DIN 46228 - solid or stranded

2 × (0.5 ... 1.5) mm² 2 × (1 ... 2.5) mm²2 × (0.5 ... 0.75) mm²2 × AWG 18 ... 14

Tightening torque

• Terminal screws

0.8 Nm

Rated voltage

• Contact block

AC 300 V

Uninterrupted current 10 A

Switching capacity A 300, R 300, A 600 same polarity



4.9 Cover frames for door cutouts

Figure 4-33: Cover frames for door cutouts

Cover frames for door cutouts raise the IP degree of protection of the circuit-breaker and help it fit into control cabinets better. Cover frames for door cutouts are available for fixed mounted, plug-in and withdrawable circuit-breakers with rotary operating mechanisms, motorized operat-ing mechanisms and RCD mod-ules. The cover frames for door cut-outs are attached to the door with 4 fixing elements.

Figure 4-34: 3VL9300-8BC00 Figure 4-35: 3VL9300-8BG00

Figure 4-36: 3VL9300-8BC00 Figure 4-37: 3VL9300-8BJ00/3VL9300-8BD00



4.10 Terminal covers/phase barriers

4.11 Phase barriers

Figure 4-38: Standard terminal cover

Figure 4-39: Extended terminal cover

Sealable terminal covers can be installed on the input and output side of the SENTRON VL circuit-breaker. They provide degree of protection IP30 for fixed mounted or withdrawable circuit-breakers in the connected posi-tion. In addition, extended terminal covers provide a separation between the phases if uninsu-lated busbars or cables are used.

Figure 4-40: Phase barriers Figure 4-41: Application of phase barriers

Phase barriers provide insulation on the input and output side of the circuit-breaker. They can be mounted in the spe-cially formed slots on the input and output sides of the circuit-breaker. They may be used in conjunction with other connection accesso-ries (except terminal covers). The phase barriers can be used with fixed mounted, plug-in and withdrawable circuit-breakers.Terminal covers must be used if the circuit-breakers are mounted directly next to each other (see Section 2.5).



4.12 Toggle handle extension

4.13 Further accessories

4.13.1 Position signaling switch

When a circuit-breaker is mounted in a withdrawable or plug-in assembly, the position signaling switch, which is equipped with a change-over contact, is used to indicate whether the circuit-breaker is in the connected or withdrawn posi-tion. Two position signaling switches can be mounted in each withdrawable or plug-in base.

Figure 4-42: Toggle handle extension

Figure 4-43: Application of toggle handle extension

Toggle handle extensions facili-tate operation of the circuit-breaker toggle handle.

VL 160X to VL 400: A toggle handle extension is not required.

VL 630 to VL 800: available as an option.

VL 1250 to VL 1600: Toggle handle extension included in scope of supply.

Figure 4-44: Position signaling switch



Technical data for the position signaling switch

4.13.2 Auxiliary conductor connection system

The plug-in connection enables two identically equipped and wired circuit-break-ers to be interchanged easily. Each socket contains 8 terminals. The VL160X, VL160 and VL250 circuit-breakers can be equipped with two sock-ets or a total of 16 terminals. The VL400, VL630, VL800, VL1250 and VL1600 circuit-breakers may have 3 sockets or 24 terminals.

General

Terminal cross sectionsScrew-type terminal standard cross sections (DIN 46228)

Tightening torquesCable connection screws 0.5 Nm

Rated operational temperature –40 °C to +85 °C

Data according to IEC/EN 61058

Rated operational current Ie with rated operational voltage Ue

Standard operationwith Ue250 V AC/400 V AC

Ie16 A/10 A

Rated making capacity At 250 V AC16 A

At 400 V AC10 A

Rated thermal current Ith 16 A

Rated operational voltage 250 V AC 400 V AC

Rated breaking capacity At 250 V AC16 A

At 400 V AC10 A

Back-up fuse (link) At 250 V AC16 A

At 400 V AC10 A

Data according to UL 1054

Rated operational current Ie with rated operational voltage UeAlternating current

Standard operation

With Ue, capacity, [horsepower]125/250 V AC, 1HP

Ie16 A

FlammabilityClass UL94V-0

Figure 4-45: Auxiliary conductor connection system

If a SENTRON VL circuit-breaker is installed in a withdrawable or plug-in assembly, the auxiliary conductor connection system connects the internal and exter-nal accessories (e.g. auxiliary switch and alarm switch, shunt release, undervoltage release, motorized operating mechanism) to the terminals on the plug-in socket.



4.13.3 Locking options for the guide frame

Locking option for the guide frame device support:

The padlocked device support also prevents a circuit-breaker from being installed in an empty device support. A safety lock (not supplied) can be used to lock the circuit-breaker in the connected or the disconnected position.

4.13.4 Guide frame crank handle

Crank handle for the guide frame:

Figure 4-46: Locking option for the guide frame device support:

The guide frame device support for the SENTRON VL circuit-breakers can be locked with up to 3 padlocks (shackles ranging from 4 to 8mm in diameter, padlocks not supplied). The circuit-breaker is prevented from moving from the connected position to the dis-connected position if the device support is secured with a pad-lock.

Figure 4-47: Guide frame crank handle

The crank handle is used to move the circuit-breaker into the con-nected or the disconnected posi-tion.



4.13.5 Trip-to-test button

4.13.6 Portable tester

Figure 4-48: Trip-to-test button

The SENTRON VL circuit-break-ers are equipped with trip-to-test buttons. When the circuit-breaker is in the connected ”ON” position, the user may test the tripping func-tion mechanically by pressing the trip-to-test button. The circuit-breaker can be reset afterwards.

Figure 4-49: Portable tester

The portable tester is a local test device for SENTRON VL circuit-breakers with electronic overcur-rent releases.It can also be used as an external voltage supply for the electronic overcurrent release (ETU and LCD ETU).

The portable tester is powered by three 9 volt batteries (included with device). An external voltage supply can optionally also be sup-plied.

Test functions:• Current converter test• Test release

External connection of thevoltage supply

Electronic connectionovercurrent release (ETU)

ON switch


Application 5


Application

5.1 Combination including frequency converter and SENTRON VL circuit-breaker

5.1.1 General information

SENTRON VL circuit-breakers can be employed as primary connection protec-tion devices in systems in which frequency converters, variable speed drives and electronic motor control devices are used. The thermomagnetic and elec-tronic releases of the SENTRON VL circuit-breaker can be used for these appli-cations. The SENTRON VL releases are not influenced by harmonic effects due to the r.m.s. measurement. Note: Alternative SIRIUS 3RV circuit-breakers can be used for applications up to approx. 45 kW.

5.1.2 SIRIUS soft starters and SENTRON VL circuit-breakers

For further detailed information, please refer to the soft starter catalogs and the selection guides.Visit us on the internet at: http://www.siemens.de/softstarter

5.1.3 Frequency converters/variable speed drives and SENTRON VL circuit-

breakers

Please refer to the respective catalogs for information about the new SINAMICS series (catalogs D11, D11.1, D21.2 and D21.3), the MICROMASTER 4 (catalog DA51.2) and the SIMOVERT MASTERDRIVES (DA65.10 and DA65.11).

Figure 5-1: Frequency converter

Up-stream:Circuit-breaker

Downstream:Converter

Application Release

Motor protection

electronic yes

Line protection

electronic yes

Thermo-magnetic

yes

Table 5-1: SENTRON VL

Q1

G1

M1

3VL

Converter

400 V…690 V, 50/60 Hz

M


Application

5.2 Circuit-breakers for capacitor banks

Application

In general, reactive power compensation is undertaken in order to reduce sys-tem losses and voltage drops in the power distribution system. As a result, the power fed into the system is used as active power and costs will be saved through a reduction in the capacitive and inductive power factors.A combination of fixed and central compensations are used depending on the design of the low-voltage system and the loads involved.

Circuit-breaker for switching and protecting capacitor banks

According to the relevant standards DIN VDE 0560 Part 41 / EN 60831-1/IEC 70, capacitors must function under normal operating conditions with the current having a r.m.s. value up to 1.3 times the rated current of the capacitor. In addi-tion, a further tolerance of up to 15% of the real value of the power must be taken into consideration.The maximum current with which the selected circuit-breaker can be constantly loaded, and which it must also be able to switch, is calculated as follows:IN max = IN x 1.5 (r.m.s. value, r.m.s. current)

Important values for selection of circuit-breakers

QN = capacitor bank rated power in kVA

UN = Rated voltage of the capacitor

IN = Rated current of the capacitor bank

IN max = Maximum expected rated current

Ii = Value for setting the instantaneous short-circuit release

IN = QN / √3

IR = IN max = IN x 1.5

Value for setting the current-dependent delayed overload release

Ii> 9 x IR (minimum)


Application

Selection of circuit-breaker for protecting and switching capacitors

This table only takes some typical applications and combinations into consider-ation. The selection for all other applications must be chosen accordingly.

Rated voltage

(50Hz)

Qc capacitor

bank power

(kvar)

Capacitor rated

current x 1.5 = IR

of the SENTRON

VL (A)

Upstream circuit-breaker

SENTRON VL

SENTRON

VL type

IR (A) Ii (A)

230V 15 56 VL 160 50 - 63 600

30 113 VL 160 100 - 125 1000

400V 25 54 VL 160 50 - 63 600

50 108 VL 160 100 - 125 1000

100 216 VL 250 200 - 250 2000

415 20 42 VL 160 40 - 50 600

40 84 VL 160 80 - 100 1000

525 25 42 VL 160 40 - 50 600

50 84 VL 160 80 - 100 1000

Table 5-2: Example selections for capacitor protective circuits


Application

5.3 Using the SENTRON VL circuit-breaker in DC networks

SENTRON VL in DC networks:

Siemens SENTRON VL circuit-breakers for line protection with thermal overload and magnetic short-circuit releases are suitable for usage in DC networks.SENTRON VL circuit-breakers with electronic overcurrent releases are not suit-able for DC networks.

Circuit-breaker selection criteria

When selecting the optimal circuit-breaker for protecting a DC network, the fol-lowing criteria should be noted in particular:• The rated current determines the rating and size of the circuit-breaker• The rated voltage determines the number of poles in series necessary for breaking• The maximum short-circuit current at the connection point determines the breaking

capacity• The type of network determines the circuit design

Load carrying capacity of the conducting path

The rated current values are the same for both DC and AC applications.

DC switching capacity

In AC circuits, arc quenching is facilitated by the fact that the current flows through the zero point. These preconditions aren't true for DC.In this case, a high arc voltage must be developed in order to interrupt the DC current.Therefore the switching capacity depends on the arc quenching method and the network voltage. Several switching contacts can be connected in series in order to achieve a higher arc voltage.Furthermore, the kind of effects that are to be expected in the event of an ground fault or double ground fault must also be taken into consideration.

Setting range of the trip values• Thermal overload release:

Same setpoints as in 50 / 60 Hz networks

• Instantaneous short-circuit release:The response threshold increases by 30 to 40%.

Example: At the Ii = 4000 A setting the overcurrent release responds at approx. 5200 A ±20%.

Depending on the voltage, a series connection of 2, 3 or 4 conducting paths is required.The following circuits are recommended since the current must flow through all current paths in order to conform to the thermal tripping characteristic curve. The threshold values of the instantaneous short-circuit release (“I” release) increase by 30 to 40% for DC.


Application

5.3.1 Suggested circuits for DC networks

3-pole and 4-pole circuit-breakers

1) NEMA interruption at 250 V DC may use single or two-pole configurations.2) with VL 160X 30 kA

Max. DC

voltage

Switching suggestion Rated

breaking

capacity for

DC

Comments

250V DC1) 250V DC circuit-breaker

32 kA 2)

2-pole switching

(non-grounded system)

500 V DC 500V DC circuit-breaker

32 kA

2-pole switching

(grounded system)The grounded pole should always

be assigned to the single con-ducting path so that 2 conduct-ing paths are always connected in series if a short-circuit occurs.


30 kA

1-pole switching

(grounded system)3 conducting paths in series.

The grounded pole is assigned to the unswitched conducting path.

250V DC1) 250V DC circuit-breaker

20 kA

1-pole switching

(non-grounded system)


20 kA

1-pole switching

(grounded system)The grounded pole should always

be assigned to the unswitched conducting path so that 2 con-ducting paths are always con-

nected in series if a short circuit occurs.

Table 5-3: Suggested circuits for 3-pole and 4-pole circuit-breakers

L

M

L

L

M

L

L

M

L

L

M

L

L

M

L


Application

5.4 Circuit-breakers for motor protection

General

The overload and short-circuit releases are designed for optimal protection and the direct-starting of three-phase AC current squirrel-cage motors. The motor protection circuit-breakers are sensitive to phase losses and have an adjustable release class.The overcurrent releases function with a microprocessor.

Area of application

Machine tools, manufacturing systems, presses, fans, air-conditioning units and packing machines all require motors which must be protected. This is the main area of application of the SENTRON VL circuit-breakers for motor protection.

5.4.1 Operating principle of the overcurrent release

Overload protection

The tripping characteristic curves of the current-dependent delayed overload releases are specially designed for overload protection of 3-phase AC motors.In current-dependent delayed overload releases, the value for IR can be set to be 0.4 to 1.0 times the rated current In of the circuit-breaker. This occurs in 0.01 increments (e.g. 0.40, 0.41, 0.42 ... 0.99, 1.00 x In) so that the circuit-breaker exactly matches the nominal current of the motor to provide optimal protection.The current converters in SENTRON VL circuit-breakers don't only measure the load current, they also supply power to the electronic overcurrent release. This independence from an external energy supply guarantees a high standard of safety. See also Section 1.15 "Overcurrent release system overview" on page 1-23.

Release class

The SENTRON VL circuit-breakers offer the option of selecting from various releases with fixed or adjustable release classes that are suitable for differing motor applications.

ETU 10 M

This version is equipped with a thermal memory, phase failure sensitivity and the fixed release class 10. See Section 5.4.3 on page 5-10.

ETU 30 M

This version is equipped with an adjustable release class of 10A to 30 in addition to the thermal memory and phase failure sensitivity. See Section 5.4.4 on page 5-11.

ETU 40 M

This version enables the parameters and the release class to be configured step by step using a menu on the LCD display that is built into the release.See Section 5.4.5 on page 5-11.

Release class

The 10A release class is used for motors which have a very simple start-up behavior (those with a short start-up time and a small moment of inertia). The class 30 releases are used to protect motors that have to withstand difficult start-up behavior (those with a long start-up time and a large moment of inertia). The motor must be suitable for difficult start-ups. The release class must be selected so that it corresponds to the overload factor of the motor under operating conditions. See Figure 5-4: Page 5-10.


Application

Definition of the release class

The release class specifies the release time for balanced 3-pole loads, starting from the cold state, with 7.2 times the set current Ir according to IEC 60947-4-1. Combinations with Class 10 are generally used.Applications that require a longer start-up time, such as fans with large blades, require a higher release class.

5.4.2 Thermal memory

All SENTRON VL circuit-breakers possess a "thermal memory" which takes the pre-loading of the AC motor into consideration. The tripping times of the cur-rent-dependent delayed overload releases are only valid for the unloaded (cold) state. The pre-loading of the 3-phase AC motor must be taken into consideration in order to prevent damage from occurring to the motor, e.g. after being frequently switched on without sufficient cooling time.Siemens SENTRON VL circuit-breakers with fixed thermal memory are offered in order to provide maximum protection for motors.

Operating principle of the thermal memory

The response time of a circuit-breaker with thermal memory is reduced to such an extent after an overload release of the circuit-breaker that further overloads cannot damage the motor windings. The motor is switched off within a time limit that is specified by the pre-loading. The current required to switch the motor on again could also be considered to be an overload.The tripping times are reduced after an overcurrent release according to the trip-ping characteristic curve. See Figure 5-3: Page 5-9.A cooling time defined by the size of the motor is required before the motor can be switched on again. The circuit-breaker prevents the motor from being turned on again during this time interval. This prevents the motor from being too highly thermally loaded by a current immediately after an overload release occurs.


Application

Phase failure sensitivity

The "phase failure sensitivity" function is also integrated into the SENTRON VL circuit-breakers for motor protection. This ensures that the motor is reliably pro-tected from overheating if a phase interruption or a large fluctuation occurs. The specified operational current IR is automatically reduced to 80% of the set value if the r.m.s. values of the operational currents in the three phases differ by more than 50%. Differences of more than 50% mean that the value of the current in the least loaded phase drops to an amount more than 50% smaller than the value of the current at the maximum loaded phase.

Figure 5-2: ETU with release classes 5, 10, 15, 20 and 30

Tripping characteristic curve for a circuit-breakers with electronic overcurrent release. Icu 100 kA maximum at 415 V

Figure 5-3: The response time of the device after an overload release

1 Without "thermal memory"2 With "thermal memory"

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Figure 5-4: Current-time curve before and after overload, with thermal memory

5.4.3 Circuit-breaker for motor protection with fixed release class ETU 10M

These circuit-breakers possess an adjustable overload and short-circuit release and a fixed release class.

They are current-limiting and have phase failure sensitivity.

Circuit-

breaker

Rated

current In

Max. rated power of

motor at 50Hz AC

Adjustable

range of the

overload

protection IR

Adjustable

range of the

short-circuit

protection II

Release

class

380/415 V 500 V

[A] [kW] [kW] [A] [A] TC [s]

VL160 63 30 37 25-63 1.5-11xIn 10

100 37, 45 55 40-100 1.5-11xIn 10

160 55, 75 75, 90 63-160 1.5-11xIn 10

VL250 200 90, 110 110, 132 80-200 1.5-11xIn 10

250 132 160 100-250 1.5-11xIn 10

VL400 315 160 200 126-315 1.5-11xIn 10

315 200 250 126-315 1.5-11xIn 10

VL630 500 250 355 200-500 1.5-11xIn 10

Table 5-4: Circuit-breaker for motor protection with fixed release class ETU 10M

Opening time

Setoverload protectioncharacteristic curve

Overload protection characteristic curveimmediately after the overload release


Application

5.4.4 Circuit-breaker for motor protection with adjustable release class

ETU 30M

These circuit-breakers possess an adjustable overload and short-circuit release and an adjustable release class.

They are current-limiting and have phase failure sensitivity.

Circuit-

breaker

Rated

current In

Max. rated power of

motor at 50Hz AC

Adjust-

able

range of

the

overload

protec-

tion IR

Adjustable

range of the

short-circuit

protection II

Release class

380/415 V 500 V

[A] [kW] [kW] [A] [A] TC [s]

VL160 63 30 37 25-63 6/8/1xIn 5/10/15/20/30

100 37, 45 55 40-100 6/8/1xIn 5/10/15/20/30

160 55, 75 75, 90 63-160 6/8/1xIn 5/10/15/20/30

VL250 200 90, 110 110,132 80-200 6/8/1xIn 5/10/15/20/30

250 132 160 100-250 6/8/1xIn 5/10/15/20/30

VL400 315 160 200 126-315 6/8/1xIn 5/10/15/20/30

315 200 250 126-315 6/8/1xIn 5/10/15/20/30

VL630 500 250 355 200-500 6/8/1xIn 5/10/15/20/30

Table 5-5: Circuit-breaker for motor protection with adjustable release class ETU 30M


Application

5.4.5 Circuit-breaker for motor protection with adjustable release class

ETU 40M

These circuit-breakers possess an adjustable overload and short-circuit release and an adjustable release class. They are current-limiting and have phase failure sensitivity. Furthermore, they are

equipped with an LCD display to display the current and the param-eterization.

Communication via Profibus is possible.

Circuit-

breaker

Rated

current In

Max. rated power of

motor at 50Hz AC

Adjust-

able

range of

the

overload

protec-

tion IR

Adjustable

range of the

short-circuit

protection II

Release class

380/415 V 500 V

[A] [kW] [kW] [A] [A] TC [s]

VL160 63 30 37 25-63 1.5-11xIn 5/10/15/20/30

100 37, 45 55 40-100 1.5-11xIn 5/10/15/20/30

160 55, 75 75, 90 63-160 1.5-11xIn 5/10/15/20/30

VL250 200 90,110 110,132 80-200 1.5-11xIn 5/10/15/20/30

250 132 160 100-250 1.5-11xIn 5/10/15/20/30

VL400 315 160 200 126-315 1.5-11xIn 5/10/15/20/30

315 200 250 126-315 1.5-11xIn 5/10/15/20/30

VL630 500 250 355 200-500 1.5-11xIn 5/10/15/20/30

Table 5-6: Circuit-breaker for motor protection with adjustable release class ETU 40M


Circuit Diagrams 6


Circuit Diagrams

The symbols used in the device circuit diagrams indicate the type, circuitry and mode of operation of the switching devices in accordance with DIN 40-713, but do not describe their construction.It is not possible to show all the possible combinations here. For versions that differ from those shown, the diagrams should be modified or supplemented accordingly.Circuit-diagrams are shown only where they are necessary to better understand the mode of operation of the equipment concerned.

Figure 6-1: Circuit diagram for VL160X - VL6303 and 4-pole circuit-breaker with thermomagnetic overcurrent release for line protection

Q1 Main contacts A1 Electronic overcurrent release

F1 Closing solenoid for A1 F2 Undervoltage release

F3 Shunt release HS Auxiliary switch

AS Alarm switch

EBS Leading auxiliary switch (integrated into the rotary operating mechanism) ON

EMS Leading auxiliary switch (integrated into the rotary operating mechanism) OFF

T1…T4 Current converter

C1

C2U<

D1

D2

NSE 00758a

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7

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HS

3

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1

2

Rotary actuatorLeading auxiliary switch

Alarm switch

Auxiliary switch


Circuit Diagrams

.

Figure 6-2: Circuit diagram for VL160 - VL2503 and 4-pole circuit-breaker with electronic overcurrent release for line and motor protection

Figure 6-3: Circuit diagram for VL400 circuit-breaker for motor protection and VL400 - VL16003 and 4-pole circuit-breakers with electronic overcurrent release for line protection

K

L

42N

K

L

K

LT4

T1

T2

T3

6

K

L

3

D1

D2

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4

119

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12

5

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8

5

6

HS3

4

1

2

T5

T6

Aux. switch

Alarm switch

Rotary actuator Leading auxiliary switch

L

K

F3 F2

T1

T3

T4

K

4

T2

NL

2

K

L

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3N 1

6

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12

5

AS7

8

5

6

HS3

4

1

2

T5

T6

Rotary actuator Leading auxiliary switch

Aux. switch

Alarm switch


Circuit Diagrams

Figure 6-4: Stored energy operator for the VL160X - VL250, without undervoltage release

Figure 6-5: Stored energy operator for the VL160X - VL250, with undervoltage release

S0 OFF (provided by the customer) S1 ON (provided by the customer)

S2 Auto/manual selector switch Y1 Closing solenoid

F Control circuit fuse


S2 Auto/manual selector switch Y1 Closing solenoid

F Control circuit fuse S01 Remote cmd. (provided by the customer)

K1 Aux. protection (provided by the customer)

Note:

A separate alarm switch contact (7-8) can be connected for automatic charging after a tripping event has occurred. Automatic closing is not recommended for a tripped circuit-breaker to avoid a fault from occurring on the protected circuit.

N (L2,L-)

S0

L1 (L+)

S1

1

S2A

2

S2B

3 4

5PE

NSE0_00762b

Y1

F

F

MCIRCUITBREAKER

CLOSED

Stored energy operator

OFF/0 ON/1AUTO/MANUAL

LOCK

OFF

ON

LOCALOFF

MANUALOFF/CHARGEHANDLE

OPEN

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OPEN CLOSED


Circuit Diagrams

Figure 6-6: Stored energy operator for the VL400 - VL800, without undervoltage release

Figure 6-7: Stored energy operator for the VL400 - VL800, without undervoltage release

S0 OFF S1 ON

S2 Auto/manual selector switch S4 Interlock “Open”

Y1 Closing solenoid F Control circuit fuse


S2 Auto/manual selector switch S4 Interlock “Open”

Y1 Closing solenoid F Control circuit fuse

S01 Remote cmd. (provided by the customer) K1 Aux. protection (provided by the customer)

Note: A separate alarm switch contact (7-8) can be connected for automatic charging after a tripping event has occurred. The automatic switching on of the circuit-breaker must be prevented. Other-wise ia short circuit could automatically occur after a tripping event.

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CircuitBreaker


Circuit Diagrams

Figure 6-8: Stored energy operator for the VL1250 and VL1600, without undervoltage release.

Figure 6-9: Stored energy operator for the VL1250 and VL1600, with undervoltage release


S2 Lock S4 Interlock “Open”

F Control circuit fuse


S2 Lock S4 Interlock “Open”

F Control circuit fuse S01 Remote control

K1 Auxiliary protection

Note: A separate alarm switch contact (7-8) can be connected for automatic charging after a tripping event has occurred. The automatic closing of a tripped circuit-breaker is not recommended in order to prevent a fault from occurring in the protected circuit.

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Circuit Diagrams

Figure 6-10: Undervoltage and shunt release for VL160X to VL1600

Figure 6-11: 3TX4701-0A delay unit for the undervoltage releases of the VL160X to VL1600.S01 Delayed release

S02 Instantaneous release for the EMERGENCY STOP loop (if required)

Protective circuit with

UVR (220 V to 250 V DC)UVR tripping time

only Y2 3 seconds

Y2 and Y1 bridged 6 seconds

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NSE0_00768


Circuit Diagrams

Figure 6-12: 4-pole 3VL1 with RCD moduleshown: 3-pole version is similar, but without N pole.

Figure 6-13: 4-pole circuit-breaker for VL160, VL1250, VL400circuit-breakers with remote trip and RCD alarm switch 3-pole is similar, but without N pole.

Q0 Circuit-breaker A Evaluation electronics

F0 Closing solenoid with local trip indication and reset

Test Test button

Q0 Circuit-breaker A Evaluation electronics

F0 Closing solenoid with local tripindication and reset

S0 Remote trip (provided by the customer) Test Test button

N 2 4 6

X12.3X12.1+ -

1N 3 5

NSE0_00769

A

Powerdisconnect

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F0

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TEST

S0

Tripping signal


Selectivity 7

SENTRON VL SystemhandbuchGWA 4NEB 110 0110-01 7-1

Selectivity

In the case of circuit-breakers connected in series, the overload and short-circuit protection is described as "selective" when – from the point of view of the energy flow – only the circuit-breaker directly upstream from the fault switches off.

7.1 Current selectivity

The selectivity can be calculated in the overload range by comparing the current characteristic curves and the time characteristic curves. In the short-circuit range, this comparison leads to values that are too low. The reason for this is that the release behaves differently in the case of short-circuit currents com-pared to its long-term behavior, e.g. in the case of overloads.If there are sufficiently different short-circuit currents at the points where two cir-cuit-breakers are mounted, the instantaneous short-circuit releases can nor-mally be set such that if a short-circuit occurs downstream from the circuit-breaker which itself is downstream from the short-circuit release, only the downstream one is addressed.If the short-circuit currents are approximately the same at the points where the cir-cuit-breakers are mounted, the time grading of the tripping current of the short-circuit release only enables selectivity up to a specific short-circuit current.This current is referred to as the selectivity limit.If the values determined by the short-circuit current calculation (e.g. according to DIN VDE 0102) at the mounting point of the downstream circuit-breaker lie below the selectivity limit listed in the respective table for the selected combi-nation, selectivity is guaranteed for all possible short-circuit reductions at the mounting point.If the calculated short-circuit current at the mounting point is higher than the selectivity limit, selective tripping by the downstream circuit-breaker is only ensured up to the value listed in the table. The project engineer must judge whether the value can be considered to be sufficient. This is the case, for exam-ple, if the probability of the maximum short-circuit current occurring is low. Oth-erwise, a circuit-breaker combination should be chosen whose selectivity limit lies above the maximum short-circuit current.

SENTRON VL Systemhandbuch7-2 GWA 4NEB 110 0110-01

Selectivity

7.2 Time selectivity

Time selectivity is an alternative possibility for securing selectivity if the short-circuit currents are approximately the same at the mounting points. In order to achieve this, the upstream circuit-breaker requires delayed short-circuit releases, so that if a fault occurs, only the downstream circuit-breaker will dis-connect the part of the system affected by the fault from the network.Both the tripping delays and the tripping currents of the short-circuit releases are graded.Zone-Selective Interlocking (ZSI) has been developed for the Siemens SEN-TRON VL circuit-breakers to prevent long, undesired release times when several circuit-breakers are connected in series.ZSI enables the tripping delay to be reduced to a maximum of 100 ms for the circuit-breaker which is upstream from the point where the short circuit occurs.When selecting a circuit-breaker, the circuit-breaker must be capable of dealing with the initial balanced short-circuit current IK at the mounting point.

7.3 Downloading the selectivity tables

The following selectivity tables are available by clicking this button in the link below:

Selectivity limits for selected and frequently requested Siemens device combi-nations. The device combinations listed cover the majority of practical applica-tions requested.

German: http://www.ad.siemens.de/cd/energie/html_00/support_selektivitaet.htmEnglish: http://www.ad.siemens.de/cd/energie/html_76/support_selektivitaet.htm


Selectivity

7.4 Information about the calculated selectivity limits

1. The selectivity values given here refer to1.1 The dynamic selectivity

i.e. the dynamic behavior of the upstream and down-stream protective devices in the time period up to 80 ms is displayed. This time period is the tripping range of the instantaneous short-circuit release (I release) of circuit-breakers.

1.2 The rated operational current Ue up to 415 V and 50 Hz1.3 Short-circuit values of a dead three-phase short-circuit.However, in practice approx. 70 - 80% of short-circuits are single-phase short circuits with low values.

(2) In addition to taking the dynamic selectivity limits into consid-eration (= the values in this table), selectivity can also be de-termined by comparing the characteristic curves of the device in the overload range (L range) and the short-time delayed short-circuit range (S range).For some combinations, the use of release options such as "selectable characteristic curves" or ZSI can solve the prob-lem of overlap.

(3) For circuit-breakers with LI and LSI characteristics, it is impor-tant to ensure that the appropriate Ii and/or Isd protection set-tings fulfill the protection function in TN/TT/IT networks. This means that the Ii and/or Isd protection setting must switch off a short-circuit within 5 s (for fixed loads) or 0.4 s (for mobile loads) respectively. Caution: The Ii and Isd protection settings also influence the selectivity behavior of upstream and downstream devices.

(4) Current selectivity: In general, only partial selectivity can be achieved using current grading (current se-lectivity through the use of LI releases)! Furthermore, complete selectivity can only be achieved up to the setpoint value of the instantaneous short-circuit release of the upstream protection device IiQ1 minus 20%, rather than up to the maximum short-circuit current Ik max! (see EN 60947 T2)

(5) Circuit-breakers with an adjustable time delay are often required in order to achieve total selectivity between two protective devices. To calculate the selectivity limit val-ues, the time delay tsd of the LSI releases is always set to the first time level and Id to the maximum value.

(6) Time selectivity:If the maximum short-circuit currents at the mounting points are approximately the same (e.g. on the main distribution board), the upstream circuit-breaker (Q1) requires a delayed short-circuit release (S release). An instantaneous release (I release) may not be connected unless the I function is turned off. Zone-Selective Interlocking (ZSI) controlled by a microprocessor has been developed by SIEMENS to prevent long, un-desired tripping times. ZSI enables the tripping delay to be reduced to a maximum of 50 ms for the circuit-breaker which is upstream from the point where the short cir-cuit occurs.

Q1

Q1

Ik max


Selectivity

(7) Further information is available from SIEMENS about this subject: Additional selectivity limit tables can be obtained on request from ourTechnical Assistance

Characteristic curves programsSimaris deSign - configuration software

(8) No characteristic/releases are listed for fuses.

The different types of fuses have the following operating classes: Type Operating class3NA gL/gG 5SA1 "quick-response"5SA2 „time-lag“5SB1/3 "quick-response"5SB2/4 "time-lag"5SC1 "quick-response"5SC2 "time-lag"5SD4/5 gR5SD6 "quick-response" 5SE2 gL/gG

(9) Explanation of the abbreviations:line = for line protectionmotor = for motor protectionstarter = starter combinationsIsolation cb = insulated circuit-breaker

IR = Current value of the overload releaseIsd = Current value of the short-time delayed short-circuit releasetsd = TIme delay of the short-time delayed short-circuit releaseIi = Current value of the instantaneous short-circuit releaseIcn = Rated short-circuit breaking capacityTM = thermomagnetic releaseETU = Electronic Trip Unit

Settings of the LI and LSI releases of the upstream and downstream protective devices for calculating the selectivity limits:IR = 1 x InIsd = maxtsd = ³ 100 msIi = max


Selectivity


Maintenance Instructions 8


Maintenance Instructions

8.1 Maintenance

SENTRON 3VL molded-case circuit-breakers are maintenance-free.

8.2 Functionality test

We recommend that the system and the circuit-breaker are inspected periodi-cally (annually) to ensure that the power distribution systems operate reliably.

Siemens points out: Functionality tests should only be carried out by qualified personnel due to the dangers associated with electrical equipment.

The following tests can be carried out in an insulated environment:• Test the operating lever to check the mechanical functioning of the circuit-breaker con-

tacts. • Operate the push-to-trip button if present. Return the circuit-breaker to the starting

position after each operation.• Examine all visible surfaces for oxidation, residues or other adverse effects.• Remove residues with a clean dry cloth.

(Never use chemical cleaners or water)• Carry out a sample check of the input and output cables. • Check the terminal screws for proper torque values.• Carry out a sample check of the terminal accessories• Replace damaged terminal accessories after cleaning terminal area. • Firmly tighten the cable screws. • Electronic circuit-breaker releases may only be tested using the specially supplied

tester.

Caution

Never attempt to carry out repairs on the molded-case or the inside of the cir-cuit-breaker! Molded-case circuit-breakers only contain maintenance-free com-ponents.


Troubleshooting 9


Troubleshooting

9.1 Information for troubleshooting

Circuit-breaker

statusCauses Corrective Action

Overload causes circuit-breaker to trip:

Excessive current The circuit-breaker is functioning correctly and switches off an overload that occurs. Check to see if the opera-tional current has exceeded the thermal tripping limit.

Carry out a visual inspection of the terminals. A discolor-ation indicates that terminals are loose. The proper torque values for the terminals are listed in the operating manual supplied with every circuit-breaker. See also the figures in Sections 3.1.2 and 3.1.3.

Connecting cables not correctly connected to the circuit-breaker

Visually inspect the terminals for discoloration. Cables can become loose during service due to various reasons, e.g. vibrations (tool machine applications) and cold flow (for aluminum cables)

Incorrect cable cross section

The correct cable size is important since the connected cable is used to dissipate heat. For example: If a cable rated 90 Amperes was carrying 150 Amperes, this would cause the cable and the circuit-breaker to excessively overheat.

Ambient temperature too high

This can be a problem on hot summer days or in areas subject to extreme heat. Although all Siemens SENTRON VL circuit-breakers are calibrated for application at an ambient temperature of 50° C, the temperatures in the housings can exceed this level. It may be necessary to consider derating the In or IR rated values. See Sections 1.10, 1.11 and 1.12.

Overcurrent release not correctly con-nected to the circuit-breaker.

If none of the above suggestions are the cause, the over-current release should be removed from the circuit-breaker and inspected for discoloration. The tightening torque values are listed in the operating manual supplied with every circuit-breaker.

Short circuit causes circuit-breaker to trip:

Excessive making cur-rent e.g. motor

Adjust the magnetic trip rating to the next highest setting or until the circuit-breaker does not trip when the motor is started.

High current peaks, e.g. when changing from star to delta in star-delta starters.

A current peak of up to 20 times the nominal current of the motor can occur when changing from star to delta. In this case, the short-circuit release “I” must be set to a higher value. However, this may cause the desired higher motor protection function to be lost.


Troubleshooting

Mechanical and electrical functions:

High humidity The circuit-breakers should not be used in environments with high humidity, since this can cause dielectric and insulation problems. In such environments, appropriate measures need to be taken such as placing the circuit-breaker in an enclosure.

Corrosion The circuit-breakers are not designed to be used in aggressive environments. In such environments, the circuit-breaker should be installed in a housing.

Function of the inter-nal accessories

Determine what type of internal accessory is installed. Remove the circuit-breaker cover and determine the type of accessory using the circuit-breaker order number. Then check its correct functioning.

• Intervoltage release:Ensure that the correct voltage is connected to the undervoltage release, since otherwise the circuit-breaker cannot be tripped.

• Shunt release: Ensure that voltage is not applied to the shunt release, since this also can prevent the circuit-breaker from tripping.

• Auxiliary and alarm switches:The auxiliary and alarm switches do not have any effect on the functioning of the circuit-breaker.

Circuit-breaker

statusCauses Corrective Action


Troubleshooting


ToSIEMENS AGA&D CD MM3P.O. Box 1954

92220 Amberg, Germany

Fax: +49 (0) 9621 / 80-3337

SENTRON VL Operating Manual

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SENTRON VL System ManualGWA 4NEB 110 0110-02

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manual edition 10/2004 - siemens · manual edition 10/2004 molded-case circuit-breakers. important...

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