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No Damage MotorStarter Protection

Type 2 Protection

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Motor starters are very susceptible to

damage during fault conditions Motor starters are tested and listed to UL

508 for Industrial Control Equipment.

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Q. Will a device applied inaccordance with the NEC that

is tested and listed according toUL 508 be operable after a faulton the motor circuit?

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A. Not necessarily!

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UL 508 Table 53.1 lists the maximumdamage criteria.

device is able to be inoperative at

the conclusion of the test. The contactsare able to weld or

completely disintegrate.

Overload relays can be burned out,and do not have to maintaincalibration.

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Example of contacts after a fault on amotor starter.

This is acceptable per UL 508.

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UL 508 acceptance criteria onlyrequires that the damage be confinedwithin the enclosure.

Some deformation is allowed, but thedoor must not blow open.

The door must be able to be opened

after the test. No discharge of parts, or risk of fire

is allowed.

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Short-circuit test on a 10HP motor starterwith MCP for short-circuit protection.

Before test.

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Motor Starter Protection

Short-circuit test on a 10HP motor starterwith MCP for short-circuit protection.

The heater elements vaporized and the contacts were severelywelded. Extensive repair or replacement would be required. Thislevel of damage is permitted by UL 508.

During test.

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Motor Starter Protection

Q. If UL 508 does not guarantee nodamage protection, what can bedone?

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Motor Starter Protection

A. Specify Type 2 protection for NEMAand IEC motor starters.

UL 508E is an outline of investigation

that allows motor starters to be testedfor Type 2 protection.

Q. If UL 508 does not guarantee nodamage protection, what can bedone?

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Motor Starter Protection

Q. What is Type 2 protection?

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Motor Starter Protection

A. Under short circuit conditions, the controllershall not result in danger to persons or theinstallation, and after the short-circuit testthe controller shall be capable of further use.

Nationally Recognized Testing Laboratories

will verify the results of the Type 2 testing.

Q. What is Type 2 protection?

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Motor Starter Protection

UL 508E section 15.4.1 lists themaximum damage criteria.

No damage to the overload relay orother parts shall occur, except thatwelding of contactor or starter contacts ispermitted when they are easily separated(as by a screwdriver) without significantdeformation. No parts are to be replacedduring the tests, except that in the case offuse protection, all the fuse links are to bereplaced.

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Motor Starter Protection

Same short-circuit test on the same typeof 10HP motor starter with LPJ fuses forprotection.

Before test.

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Motor Starter Protection

This photo taken during the test illustrates the level of protectionrequired by UL 508E. After the test, the overload relaysmaintained factory calibration, which is important to retainoverload protection. This starter could be put back into servicewithout any repair.

Same short-circuit test on the same typeof 10HP motor starter with LPJ fuses forprotection.

During test.

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Motor Starter Protection

Example of contacts after a fault on acircuit with Type 2 protection.

Damage is not allowed.

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Motor Starter Protection

Q. How can Type 2protection beachieved?

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Motor Starter Protection

A. By using Bussmann Low-Peak fuses sizedaccording to Type 2

protection tables.

Q. How can Type 2protection beachieved?

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Motor Starter Protection

Q. Where can Type 2 protection tables befound?

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Motor Starter Protection

A. They are available online at: http://www.bussmann.com/products/datasheet.asp?prmS

Data sheets 8108-8114

In the SPD Handbook on pages 128-141.

Q. Where can Type 2 protection tables befound?

http://www.bussmann.com/products/datasheet.asp?prmSort=Datasheethttp://www.bussmann.com/products/datasheet.asp?prmSort=Datasheet

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Example of Type 2 Table

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Motor Starter Protection

Q. How are the tables used?

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Example of Type 2 Table

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Example of Type 2 Table

A. For 480V, 3 HP, size 0 starter, Square D partnumber SB02V02S with heater B7.70.

Choose from Bussmann Low Peak fuses:

LPS-RK-8SP, LPJ-9SP, or LP-CC-12

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Type 2 tables are available for:

General Electric

Rockwell Automation/Allen-Bradley

Square D Co.

Siemens Cutler-Hammer

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Q. What do I get when I specify Type 2protection with Low-Peak fuses?

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A. Maximum safety for personnel andequipment.

Minimum cost to stay in service.

Maximum productivity from the equipment.

Minimum downtime after a fault.

Q. What do I get when I specify Type 2protection with Low-Peak fuses?

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