Abstract: A circuit breaker comprising a main contact portion and an actuator portion spaced therefrom and intercoupled therewith by a toggle mechanism, the main contact portion including a fixed-contact member and a movable-contact assembly being actuated into and out of closed relationship with the fixed-contact member by the toggle mechanism upon operation of a hand crank to which is attached an actuator shaft which carries a cam, rotation of the cam by the actuator shaft resulting in movement of the toggle mechanism from a folded condition to an extended condition, closing energy being stored simultaneously in a closing spring assembly through the action of a transmission link carried on the actuator shaft and coupled to the closing spring, such transmission link being coupled to a cam follower which carries a drive plate thereon, such drive plate being coupled to the toggle mechanism, such cam follower being limited in its rotation by a locking action, following which rotation of the actuator shaft stores energy i