Patent ID: 6388859
Filing Date: 2002-05-14
Classification: H01H

Abstract:
A method of controlling the movement of a tripping plunger of a tripping solenoid in a shunt trip assembly of a circuit breaker, the tripping plunger being movable along a tripping path between a retracted position and an extended position, the method comprising the steps of:blocking movement of the tripping plunger from the retracted position to the extended position; in which the step of blocking includes the step of positioning a locking plunger of a locking solenoid in the tripping path; further comprising the step of removing the locking plunger from the tripping path, the locking plunger being movable along a locking path between an extended position and a retracted position; in which the step of removing includes the steps of energizing the locking solenoid and moving the locking plunger from the extended position to the retracted position; and further comprising the steps of energizing the tripping solenoid, moving the tripping plunger from the retracted position to the extended position, and preventing movement of the locking plunger from the retracted position to the extended position.