An electrical circuit breaker comprises a housing; separable contacts housed within the housing and moveable between a closed position and an open position; an operating mechanism for moving the separable contacts between the closed position and the open position thereof, the operating mechanism having a first position and a second position corresponding to the open position of the separable contacts; a latch for latching said operating mechanism in the first position thereof and for releasing the operating mechanism to the second position thereof; a trip bar movable in a first direction and a second direction for unlatching said latch, the trip bar including first and second pivot pockets for pivotally mounting the trip bar within the housing; a sensor for sensing an electrical condition associated with the separable contacts and for moving the trip bar in the second direction in order to unlatch the latch, to release the operating mechanism to the second position thereof, and to move the separable contacts to the open position thereof; and first and second clips respectively positioned in the first and second pivot pockets for providing bearing surfaces in the trip bar.

A presently-preferred embodiment of a circuit breaker comprises a contact mechanism adapted to be electrically coupled to an electrical circuit. The contact mechanism comprises a first contact member and a second contact member being movable in relation to the first contact member. The circuit breaker also comprises an actuator mechanism comprising an armature mechanically coupled to the second contact member. The armature is selectively positionable between a closed position in which the armature urges the second contact member into electrical contact with the first contact member thereby permitting energization of the electrical circuit, and an open position in which the armature urges the second contact member away from the first contact member thereby inhibiting energization of the electrical circuit.

An interlock for two circuit breakers, with the circuit breakers configured in the same electrical circuit and with each circuit breaker having a cross bar and contact assembly. The interlock comprises a pivot pin mounted a spaced distance from the two circuit breakers. An interlock yoke having two ends, with a notch proximate each end of the yoke and the yoke is coupled to the pivot pin. A first operator rod having a first end is configured to engage the cross bar and contact assembly of one circuit breaker and has a second end configured to engage the notch of the yoke. A second operator rod having a first end is configured to engage the cross bar and contact assembly of the other circuit breaker and has a second end configured to engage the notch of the yoke. When one operator rod is moved by the cross bar and contact assembly of one circuit breaker, that operator rod pivots the yoke, causing the other operator rod to block the operation of the other circuit breaker.

A locking attachment is for a circuit breaker. The circuit breaker includes a housing enclosing separable contacts and an operating mechanism, an elongated operating member with a handle that operates to open and close the separable contacts, and an opening in the housing through which the elongated operating member protrudes. The opening has first and second ends corresponding to "on" and "off" circuit breaker positions, respectively. The locking attachment includes a locking member having a first end having a compressive segment with opposed portions for compressively capturing the operating member. The second end of the locking member is structured to engage the housing of the circuit breaker at one of the first and second ends of the opening in the housing, thereby locking the circuit breaker in either the "on" or "off" position.

A locking apparatus is for a circuit breaker including an enclosure having an opening with two sides and two ends, and two apertures on each of the sides proximate the ends. An operating mechanism includes a pivotal operating handle disposed through the opening. The operating handle includes a first position proximate one end of the opening and a second position proximate the other end of the opening. The locking apparatus is disposable proximate one of the ends of the opening. The locking apparatus includes a housing and a spring member interlocked with the housing. The spring member includes a first end and an opposite second end retained by the enclosure at the apertures at one of the ends when the operating handle is in the second position, or retained by the enclosure at the other apertures at the other of the ends when the handle is in the first position.