Patent ID: 7369021

Claim:
An undervoltage release mechanism for a circuit breaker including a handle arm rotatable through an arc between an on position, an off position, and a reset position beyond the off position, said undervoltage release mechanism comprising: a handle arm pin structured to project laterally from the handle arm out of the plane of the arc through which the handle arm rotates; an undervoltage relay comprising a plunger that is extended to a trip position when voltage in a protected circuit drops below a specified value, and a reset lever that retracts the plunger when actuated; and an interface lever between the handle arm pin and the reset lever, said interface lever structured to translate arcuate movement of the handle arm pin as the handle arm moves to the off position into actuation of the reset lever, the interface lever being formed at least partially of a compliant material that flexes to accommodate for overtravel of the handle arm pin and stackup of tolerances.