A multi-pole circuit interrupter configured to be coupled between an AC source and an electric load electronically detects a hazardous condition associated with energizing of poles and responds to overcome the hazardous condition using a solenoid. The multi-pole circuit interrupter comprises a first switch to energize a first pole on a phase A conductor of the multi-pole circuit interrupter and a second switch to energize a second pole on a phase B conductor of the multi-pole circuit interrupter. The multi-pole circuit interrupter further comprises an electronic solid-state circuit coupled to the phase A conductor and the phase B conductor to detect a line voltage variation and control a current to a device in response to trip an energized pole among the first pole and the second pole if only one of the first pole and the second pole is energized when a user controls a tie bar to turn ON or turn OFF the multi-pole circuit interrupter or when a trip bar fails to trip one of the first pole and the second pole.

A trip bar cam unit for a trip bar is provided. The trip bar cam unit includes a trip bar cam unit body, a cam lever, and a keyed protrusion. The trip bar cam unit body defines an axis of rotation. The cam lever extends generally radially from the trip bar cam unit body. The keyed protrusion corresponds to a trip bar axial bore.

A circuit breaker assembly includes a plurality of circuit breakers each including a housing with a trip mechanism therein and each having an opening in a side of the respective housing. Each trip mechanism has a coupler disc connected thereto. The plurality of circuit breakers are aligned in an end-to-end fashion with a trip member positioned along a side of the housings and connected to the coupler discs such that if the first trip mechanism actuates from a untripped state to a tripped state the trip member actuates the second trip mechanism from a untripped state to a tripped state and vice versa.

A contact module for a circuit breaker is disclosed, comprising: a base, a cover, an operation mechanism, at least three kinds of asymmetrical single-pole switches and a release mechanism. The cover is mounted on the base to form a space, where the mechanisms and the switches are disposed. The operation mechanism is connected to one switch; the release mechanism to the at least three switches. Each switch comprises a strong side and a weak side. For each switch, there is a thick contact housing on the strong side connected to a thick shaft, and a thin one on the weak side connected to a thin shaft. A rotor component has a single contact spring mounted on the weak side. Rotation shafts are connected by a linkage shaft to connect the single-pole switches; a strong side of one switch is connected to a weak side of another switch.

Circuit breakers with handles have common trip cams with an integrated spring and trip cam base. The integrated spring directly contacts the armature in lieu of having the trip cam base formed to do so thereby allowing the use of alternative trip cam base configurations and materials from conventional relatively expensive materials.

A circuit breaker assembly includes a plurality of circuit breakers each including a housing with a trip mechanism therein and each having an opening in a side of the respective housing. Each trip mechanism has a coupler disc connected thereto. The plurality of circuit breakers are aligned in an end-to-end fashion with a trip member positioned along a side of the housings and connected to the coupler discs such that if the first trip mechanism actuates from a untripped state to a tripped state the trip member actuates the second trip mechanism from a untripped state to a tripped state and vice versa.

A circuit breaker is configured to be remotely caused to enter ON and OFF states. A lever arm is pivotably coupled to a main contact spring. A contact is supported at the distal end portion of the lever arm. Pivoting of the lever arm to bring the contact into contact with another contact on the housing causes the circuit breaker to enter the ON state. Pivoting of the lever arm to separate the contacts causes the circuit breaker to enter the OFF state. A latching solenoid includes a plunger coupled to the lever arm. The latching solenoid moves the plunger between a retracted configuration and an extended configuration. When in the extended position, the lever arm is pivoted to separate the contacts to cause the circuit breaker to enter the OFF state.

A circuit breaker includes a housing, a first trip mechanism, and a second trip mechanism. The first trip mechanism includes a first plunger selectively spring biased to a first plunger extended position from a first plunger retracted position. The second trip mechanism includes a second pin supported on the first plunger and configured to be driven by the first plunger to a second pin extended position that follows the first plunger extended position. A second lever fixed with respect to the second pin is configured to be driven by the second pin to a second lever extended position. A second plunger is selectively spring biased to a second plunger extended position, and when the second pin is driven to the second pin extended position, the second lever follows the second pin to the second lever extended position to allow the second plunger to be in the second plunger extended position.