starter and motor protection trip class t c 20 / 20e 10a, 10 / 10e 10a, 10 / 10e, 20 / 20e, 30 / 30e...

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3VA molded case circuit breaker Starter and motor protection

Totally Integrated Power - SENTRON

Unrestricted / © Siemens AG 2015. All Rights Reserved.

3VA molded case circuit breaker

Starter and motor protection

3VA1 MCCB 3VA2 MCCB

Applications Starter protection Starter and motor protection

Frame sizes 60 A 250 A 160 A 250 A 400 A 630 A

Rated currents 32 A – 200 A 25 A - 500 A

Trip Unit AM I / LSI; LSIG

IEC breaking capacity Icu 415 V 50/60 Hz 55kA , 70kA 55kA, 110kA

Communication Not available Available

Metering Not available Available



Starter protection vs. motor protection

Starter protection Motor protection

Overload relay

(3RB; 3UF7)

Overload

protection

Contactor

Functional

switching

MCCB (3VA)

Instantaneous

protection

Motor

Contactor

Functional

switching

MCCB (3VA)

Instantaneous

protection

Overload protection

… and more

Motor

MCCB (3VA)

Instantaneous

protection

Overload protection

Functional switching

… and more

Motor



Starter protection and motor protection

3VA1 3VA2 3VA2 3VA2

TM120M ETU310M ETU350M ETU860M

Starter

protection

Starter

protection

Motor

protection

Motor

protection

Protection

L overload (long time) Ir

Thermal memory

S short time delay short circuit Isd

I instantaneous short circuit Ii

G ground fault Ig

Additional features

Prepared for higher inrush currents from IE3 motors

Phase unbalance protection available * *

Blocking protection * *

Idle running protection

Power metering integrated

Communication as option

* Function can be achieved with the overload relay (3RB; 3UF7)



IE3 standard (1/2)

January 1st 2015 The IE3 standard

is mandatory in

Europe since

In the power range

0.75 7.5 375 kW

from 2017 on from 2015 on

• Newly installed motors

• Motors in continuous operation

It applies to



IE3 standard (2/2)

Nominal

current

Starting

current

Inrush

current

Before Motors according

to IE3 standard

IE3 Premium Efficiency

motors

• Higher efficiency factor

because of less ohmic loss

• Reduced nominal current

Less ohmic loss

• Lower resistance

• Increase of starting

current

A fact that you won‘t find in

data sheets - but what we

have analyzed for you:

The inrush current rises

enormously!



Inrush current and instantaneous short circuit

3VA1 3VA2 3VA2 3VA2

TM120M ETU310M ETU350M ETU860M

Starter protection Starter protection Motor protection Motor protection

Protection

Ii 7 … 16 x In2) 3 … 15 x In

1) 15 x In1) 3 …15 x In

1)

Ii Default setting Minimum rotary

switch setting

Minimum rotary

switch setting

Minimum rotary

switch setting

Minimum setting

1) Some frames sizes and current ratings have limited adjustment setting. For more information, please refer to the device manual/FAQ@ SIOS.

2) Up to 125 A, In: 200 A Ii = 7….14 x In

All our 3VA molded case

circuit breakers are

prepared for increased

inrush current generated

by IE3 motors.



Overload parameter settings

3VA2 3VA2

ETU350M ETU860M

Motor protection Motor protection

Protection

Ir 0,4 … 1 x In 0,4 … 1 x In

Setting time delay

@ overload Trip class TC

Trip class Tc or

Tripping time TP

Trip class TC

10A, 10 / 10E

20 / 20E

10A, 10 / 10E,

20 / 20E, 30 / 30E

Tripping time TP 3 … 30 s 1)

1) Some frames sizes and current ratings have limited adjustment setting. For more information, please refer to the device manual/FAQ@ SIOS.

Using the mode „Trip class TC“ to set the time delay @ overload means always to select a time range

for overload protection.

Example: TC = 20 6s < TP ≤ 20s according to IEC 60947-4-1

A more precise way to set the tripping time is to directly edit the TP with the ETU860M.



Tripping time, trip class acc. to IEC 60947-4-1

Tripping classes of overload protection devices in acc. with IEC 60947-4-

1

100

50

20

10

5

2

1 50

20

10

5

2

1

0,7 1 2 5 8

t

x Ie

120

CLASS 30 CLASS 25 CLASS 20 CLASS 15 CLASS 10 CLASS 5

Tripping characteristic curve

for 3-pole sym. load

30 and 30E

2 s < tA < 10 s 10 A

10 and 10E

20 and 20E

4 and 5 s < tA < 10 s

6 and 10 s < tA < 20 s

9 and 20 s < tA < 30 s

CLASS Tripping time

The tripping classes are based on the tripping time

(tA) at 7.2-times the set current Ie from cold state.

Suffix “E” in class means narrower tolerance

available in solid-state OLR

The overload protection device has to

trip within these times!


The average current and the unbalance ratio are calculated based on:


Phase unbalance protection

If one of the 3 phases fail, a three-phase motor continues to run like a single-phase motor with an

enormous decrease of load torque. There is a high risk that the motor stops rotating.

With the feature „phase unbalance protection“ the 3VA molded case circuit breaker trips by exceeding

the phase unbalance values for the time tunbalance.

3VA2 3VA2

ETU350M ETU860M

Motor protection Motor protection

Protection

Unbalance Ratio 40% fix 5 … 50% (default 40%)

Phase unbalance protection availability ON ON / OFF (default ON)

Delay time tunbalance

0,7s during start up

4s during normal operation

0,7s during start up

4s during normal operation



Blocking protection

• Stone crusher (stone too hard / large)

• Conveyer belt (transport goods wedged)

Motor blocking (or falling back behind breakdown torque) generates high motor

current (close to starting current). But it‘s still not as high as a short circuit

current!

Without the blocking protection feature it might take up to 30s or more

(depending on current and TP setting) until the breaker trips

unnecessary thermal stress

Application examples for blocking protection

3VA2

ETU860M

Motor protection

Protection

Ib 1,2 … 10 x In in A (default 10)

Delay time tb 1 … 10s (default 1s)

Blocking protection availability ON / OFF (default ON)

During the start up phase (ramp up), blocking protection is automatically disabled

until the motor reaches the operating speed (tstart). tstart equals tb.



Idle running protection

• Load transmission between motor and application was lost

(belt rupture, broken chain …)

• Pump, compressor

With the accessory for idle running protection the motor can be switched off by

tripping the circuit breaker.

Application examples for idle running protection

3VA2

ETU860M

Motor protection

Protection

I<< 0,3 … 0,9 x Ir (default 0,9)

Delay time t<< 1 … 200s (default 1s)

Idle running protection availability ON / OFF (default OFF)


3VA1 molded case circuit breaker

Starter protection – TM120M (3VA11/12)

Front view Characteristic curve

Size In Ii

Class

M, H

160 A

(3VA11)

32 A 220 … 510 A

40 A 280 … 640 A

50 A 350 … 800 A

63 A 440 … 1010 A

80 A 560 ... 1280 A

100 A 700 ... 1600 A

125 A 875 … 2000 A

250 A

(3VA12)

160 A 1120 ... 2560 A

200 A 1400 … 2800 A

Ii



Starter protection – ETU310M I


Size In Ii

Class

C, L

160 A

(3VA21)

25 A 75 … 375 A

40 A 120 … 600 A

63 A 189 … 945 A

100 A 300 … 1.500 A

250 A

(3VA22)

160 A 480 … 2.400 A

200 A 600 … 3.000 A

400 A

(3VA23) 250 A 750 … 3.750 A

630 A

(3VA24)

400 A 1.200 … 6.000 A

500 A 1.500 … 7.500 A

Ii



Motor protection – ETU350M LSI


Size In Ir Tc

Isd tsd Ii 10A 10 / 10E 20 / 20E

Class

M, C

160 A

(3VA21)

25 A 10 … 25 A

4 8

17

3 …15 Ir 30 ms

375 A

40 A 16 … 40 A 17 600 A

63 A 25 … 63 A 17 945 A

100 A 40 … 100 A 17 1.500 A

250 A

(3VA22)

160 A 63 … 160 A 17 2.400 A

200 A 100 … 200 A 15 3.000 A

400 A

(3VA23) 250 A 100 … 250 A 17 3.750A

630 A

(3VA24)

400 A 160 … 400 A 17 6.000 A

500 A 250 … 500 A 15 7.500 A



Motor protection – ETU860M LSIG (1/2)


Size In Ir Isd tsd Ii Ig tg

Class

M, C

160 A

(3VA21)

25 A 10 … 25 A

1,2 … 15 x In 30 ms

75 … 375 A 5 … 25 A, OFF

50 … 800 ms

40 A 16 … 40 A 120 … 600 A 8 … 40 A, OFF

63 A 25 … 63 A 189 … 945 A 13 … 63 A,

OFF

100 A 40 … 100 A 300 … 1.500 A 20 … 100 A,

OFF

250 A

(3VA22)

160 A 63 … 160 A 480 … 2.400 A 32 … 160 A,

OFF

200 A 80 … 200 A 600… 3.000 A 50 … 250 A,

OFF

400 A

(3VA23) 250 A 100 … 250 A 750… 3.750 A

50 … 250 A,

OFF

630 A

(3VA24)

400 A 160 … 400 A 1.200 … 6.000 A 80 … 400 A,

OFF

500 A 250 … 500 A 1.500 … 7.500 A 100 … 500 A,

OFF



Motor protection – ETU860M LSIG (2/2)


Size In

TC Tp I Ib tb I<< t<<

10A 10 / 10E 20 / 20E 30 30E

Class

M, C

160 A

(3VA21)

25 A

4 8

17 24 24 3 … 30 s

OFF, 5 … 50%

30 … 250 A, OFF

1 … 10s 0,3 … 0,9 x Ir 1 … 200s

40 A 17 24 24 3 … 30 s 48 … 400 A, OFF

63 A 17 24 24 3 … 30 s 76 … 630 A, OFF

100 A 17 24 24 3 … 25 s 120 … 1000 A, OFF

250 A

(3VA22)

160 A 17 20 – 3 … 20 s 162 … 1600 A, OFF

200 A 12 15 – 3 … 15 s 240 … 2000 A, OFF

400 A

(3VA23)

250 A 17 24 24 3 … 30 s 300 … 2500 A, OFF

630 A

(3VA24)

400 A 17 24 24 3 … 25 s 480 … 4000 A, OFF

500 A 12 15 – 3 … 15 s 600 … 5000 A, OFF

Tc: Tripping Class I: unsymmetrie of the current I<<: pick up current idle protection Ib: pick up time blocking protection

Tp: Tripping Time t<<: delay time idle protection tb: pick up current blocking protection


3VA tables with IE3 motors – motor protection

breaker

SENTRON 3VA circuit breaker for motor protection

In this case, the 3VA circuit breaker for motor protection is also doing the functional

switching



Starter protection/motor protection – tested combinations

Starter protection Motor protection Coordination tests

Tested combinations can be

found in the shape of an FAQ in

SIOS.

The corresponding factory

certificate can also be found in

SIOS.

Please note for these

combinations:

Functional switching is done

by the contactor

Mounting rules have to be

heeded

Unless otherwise indicated,

the combinations are IE3ready

Overload relay

Overload

protection

Contactor

Functional

switching

MCCB (3VA)

Instantaneous

protection

Motor

Contactor

Functional

switching

MCCB (3VA)

Instantaneous

protection

Overload protection

… and more

Motor


3VA tables with IE3 motors – motor protection

breaker-contactor-combination

SENTRON 3VA motor protection breaker – device combinations


3VA tables with IE3 motors – starter protection

breaker-contactor-overload relay-combination

SENTRON 3VA1 starter protection breakers – device combinations




SENTRON 3VA starter protection breakers – device combinations with overload relay 3RB20/21




SENTRON 3VA starter protection breakers – device combinations with overload relay 3RB22/23

and SIMOCODE pro 3UF7


Thank you for your attention!

siemens.com/3VA

starter and motor protection trip class t c 20 / 20e 10a, 10 / 10e 10a, 10 / 10e, 20 / 20e, 30 / 30e...

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