Abstract: A plug-in trip unit joint 900 for a molded case circuit breaker 10, with the circuit breaker 10 having an operating mechanism 40 with a movable contact arm 45 mounted on a cross-bar 55, a trip bar 618 and a line terminal mounted in a first housing and a trip unit 600 and a load terminal 16 mounted in a second housing. The plug-in trip unit joint 900 comprises a trip unit stab 910 coupled to the trip unit 600 and load terminal 16 and extends from the second housing and a movable contact arm clamp assembly 909 mounted in the first housing and aligned to selectively engage the trip unit stab 910 wherein the line terminal 18 and the load terminal 16 are electrically coupled together and with the trip unit in selective contact with the operating mechanism 40 of the circuit breaker 10.

Abstract: A mechanism for accumulating and storing mechanical energy, wherein the energy is used to close the primary contacts of a circuit breaker. The energy can be input to the mechanism manually or by means of a motor. The mechanism includes a series of linkages which function to utilize the energy to close the primary contacts. These linkages also function to maintain the closing force upon the primary contacts, while also functioning to allow rapid contact opening when desired.

Abstract: A charging handle assembly for charging the closing springs of a stored energy mechanism which closes the contacts of a circuit breaker. The charging handle has a generally U-shape and is pivotally attached to the circuit breaker cover. The handle is adapted to cooperate with the stored energy mechanism such that the cover and handle are easily removed from the circuit breaker. Additionally, the handle cooperates with the cover and the stored energy mechanism so that energy is transferred to the springs of the mechanism by pumpiing the handle.