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How does an undervoltage accessory trip a circuit breaker?

Published date: 22 May 2020

Issue:
How does a UVR undervoltage work?

Product Line:
Circuit Breakers

Environment:
Applies to all undervoltage trip accessories, whether field or factory installed.

Cause:
Understanding the function of an undervoltage trip accessory.

Resolution:
An undervoltage trip device is an optional accessory in a circuit breaker that mechanically trips the breaker when voltage to the terminals drops below a threshhold level. The power for the undervoltage trip does not come from within the breaker, so it must be supplied from an external source. Some circuit breakers allow field installlation of a undervoltage trip kit, while others require factory installation when the breaker is ordered. Check the specific breaker type for available ac and dc voltage ratings and for the method of installation.

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