ELECTRIC CIRCUIT BREAKER WITH AUXILIARY TRIP MECHANISM

摘要

An electric circuit breaker having a circuit closing mechanism including a rotary drive shaft movable in opposite pivotal directions and a cam movable by the drive shaft along a predetermined path in one direction to effect a closed circuit condition across the breaker is provided with an auxiliary trip actuating mechanism associated with the rotary shaft. The auxiliary trip actuating mechanism includes a trip drive plate mounted on the drive shaft for movement therewith in opposite pivotal directions and a trip arm mounted on the cam for pivotal movement between a retracted position and a tripping position, the trip arm being responsive to movement of the trip drive plate in a direction opposite said one direction to drive the trip arm toward its tripping position when the breaker is in a closed circuit condition.