A reset lockout mechanism for a circuit breaker includes a linkage, a rocker, an armature, a solenoid, and a plunger. The linkage is positioned to move between an open position and a closed position. The rocker is selectively engageable with the linkage. The armature is selectively engageable with the rocker. The plunger is supported by the solenoid and operatively coupled to the armature. The plunger is movable between a first position and a second position.

A linkage worm gear for an automatic opening/closing driving mechanism, wherein the linkage worm gear is integrally and concentrically provided with a worm gear driven portion, a gear driving portion and a cam linkage portion successively in the direction of the rotation central axis thereof; worm gear teeth fitted with a driving worm gear are provided on the whole peripheral wall of the worm gear driven portion; a reset groove, a recess, a transition portion and a boss are successively provided on the periphery of the cam linkage portion; and a plurality of driving teeth are provided on part of the peripheral wall of the gear driving portion.

A linkage worm gear for an automatic opening/closing driving mechanism, wherein the linkage worm gear is integrally and concentrically provided with a worm gear driven portion, a gear driving portion and a cam linkage portion successively in the direction of the rotation central axis thereof; worm gear teeth fitted with a driving worm gear are provided on the whole peripheral wall of the worm gear driven portion; a reset groove, a recess, a transition portion and a boss are successively provided on the periphery of the cam linkage portion; and a plurality of driving teeth are provided on part of the peripheral wall of the gear driving portion.

A reset lockout mechanism for a circuit breaker includes a linkage, a rocker, an armature, a solenoid, and a plunger. The linkage is positioned to move between an open position and a closed position. The rocker is selectively engageable with the linkage. The armature is selectively engageable with the rocker. The plunger is supported by the solenoid and operatively coupled to the armature. The plunger is movable between a first position and a second position.

A reset lockout mechanism for a circuit breaker includes a linkage, a rocker, an armature, a solenoid, and a plunger. The linkage is positioned to move between an open position and a closed position. The rocker is selectively engageable with the linkage. The armature is selectively engageable with the rocker. The plunger is supported by the solenoid and operatively coupled to the armature. The plunger is movable between a first position and a second position.

A circuit breaker includes a line phase terminal, a load phase terminal, a line neutral terminal, a conductive path formed between the line phase terminal and the load phase terminal, the conductive path having an open configuration and closed configuration, a sensor, a linkage configured to move the conductive path between the open configuration and the closed configuration, a rocker selectively engageable with the linkage, the rocker configured to move the linkage between an open position and a closed position, and an arm selectively engageable with the rocker, the arm to prevent the conductive path from moving to the closed configuration unless the circuit breaker passes a self-test when movement of the rocker is detected. A trip operation of the circuit breaker includes a time delay based upon an amount of current on the conductive path detected by the sensor.

A circuit breaker includes a line phase terminal, a load phase terminal, a line neutral terminal, a conductive path formed between the line phase terminal and the load phase terminal, the conductive path having an open configuration and closed configuration, a sensor, a linkage configured to move the conductive path between the open configuration and the closed configuration, a rocker selectively engageable with the linkage, the rocker configured to move the linkage between an open position and a closed position, and an arm selectively engageable with the rocker, the arm to prevent the conductive path from moving to the closed configuration unless the circuit breaker passes a self-test when movement of the rocker is detected. A trip operation of the circuit breaker includes a time delay based upon an amount of current on the conductive path detected by the sensor.

A fusion welding isolation mechanism for an operating mechanism of a circuit breaker is provided. The operating mechanism of circuit breaker includes: a tripping component, a left side, a right side plate, a latch, a half shaft, a lever, and a main shaft. The tripping component, the latch, and the lever are mounted between the left side plate and the right side plate. The half shaft and the main shaft penetrate through the left side plate and the right side plate, and extend out of the left side plate and the right side plate. The tripping component, the latch, the half shaft, the lever, and the main shaft move in linkage. The lever and the main shaft are provided with isolation devices for preventing an operation handle from an opening operation when a moving contact is subject to fusion welding.

A fusion welding isolation mechanism for an operating mechanism of a circuit breaker is provided. The operating mechanism of circuit breaker includes: a tripping component, a left side, a right side plate, a latch, a half shaft, a lever, and a main shaft. The tripping component, the latch, and the lever are mounted between the left side plate and the right side plate. The half shaft and the main shaft penetrate through the left side plate and the right side plate, and extend out of the left side plate and the right side plate. The tripping component, the latch, the half shaft, the lever, and the main shaft move in linkage. The lever and the main shaft are provided with isolation devices for preventing an operation handle from an opening operation when a moving contact is subject to fusion welding.

Multi-pole and single-pole circuit breakers include a housing and a reset lockout mechanism disposed within the housing. The reset lockout mechanism disables electrical communication between line and load terminals of the circuit breaker if a predefined condition exists. Some circuit breakers include a single actuator, transition between ON and OFF states, and are capable of performing test functions. The test functions may involve testing AFCI and/or GFCI functions of the circuit breakers. The test functions may be performed when the circuit breaker transitions from an OFF state to an ON state. Some circuit breakers including a reset lockout mechanism may be powered only on its line side. Some circuit breakers provide an electrical indication when they are in the OFF state.