A circuit breaker includes a first electrical contact and a second electrical contact moveable between an open state and a closed state; an armature, wherein movement of the armature from a first position to a second position initiates the first electrical contact and the second electrical contact to move from the closed state to the open state; a first electromagnetic device configured to move the armature from the first position to the second position in response to being energized by a first signal; and a second electromagnetic device configured to move the armature from the first position to the second position in response to being energized by a second signal and in response to generation of the first signal and the first electrical contact and the second electrical contact still being in the closed state. Other circuit breakers and methods of operating circuit breakers are disclosed.

A clapper-type electromagnetic release for a miniature circuit breaker is characterized by including an armature, a magnet yoke, a coil, an iron core, a shaft, and an armature torsion spring. The iron core is mounted on the magnet yoke. The coil is sleeved on the iron core. The armature is mounted on the shaft and can rotate around the shaft. The armature torsion spring is mounted on the shaft. The armature torsion spring presses against the armature, so that the armature can be reset. In the clapper-type electromagnetic release for a miniature circuit breaker, by the rotation of the armature, the armature is not closed in absorption and the circuit breaker mechanism is not tripped within a specified current range; and when the specified current range is exceeded, the armature is closed in absorption and the armature claps a lock, so that the circuit breaker mechanism is tripped.

A thermomagnetic trip assembly includes a thermal trip, a magnetic trip, and first and second actuation levers. The thermal trip includes a bimetal strip that is capable of deforming in order to actuate the first actuation lever. The magnetic trip includes a movable armature, a fixed armature and an electrical conductor. The movable armature is capable of moving in order to actuate the second actuation lever. The electrical conductor and the bimetal strip are electrically connected in series with one another between first and second connection terminals of the trip assembly. The movable armature is connected to the first connection terminal, the fixed armature is connected to the second connection terminal, and the respective contact areas of the fixed armature and of the movable armature are made of electrically conductive materials that exhibit a low degree of mutual weldability.

The present disclosure relates to an arc extinguishing device of a molded case circuit breaker which includes a fixed contactor fixedly provided on part of a base assembly case; a movable contactor brought into contact with or separated from the fixed contactor; and an arc extinguishing unit configured to extinguish an arc generated when the movable contactor is separated from the fixed contactor, and the arc extinguishing unit including a pair of side plates provided on the base assembly case; and a plurality of grids provided to have a predetermined distance between the pair of side plates, and the grid including a first grid formed with a first cutout portion on a first side surface where an arc is generated; and a second grid formed with a second cutout portion having a depth different from that of the first cutout portion on a second side surface where an arc is generated.

A contactor includes a fixed iron core, a movable iron core, an operation coil, a first crossbar, a tripping spring, and a second crossbar. The contactor includes a push spring to push a movable contact toward a fixed contact, a trip coil connected to the fixed contact, and a plunger that is operated by an electromagnetic force generated in the trip coil when a current of a predetermined value or higher flows through the trip coil. The contactor includes an opening lever to push the second crossbar in a direction away from the first crossbar in conjunction with the operation of the plunger.

The circuit breaker according to the present invention comprises: a pair of contact mechanisms for switching a pair of circuits; a switching mechanism for driving the pair of contact mechanism to a circuit opening position or a circuit closing position; a trip bar rotatable to a first position for latching the switching mechanism or to a second position for releasing the switching mechanism; and an instant trip mechanism for pressing the trip bar to rotate to the second position, wherein the instant trip mechanism comprises a pair of armature assemblies and movable to a position for pressing the trip bar to rotate to the second position; and a pair of electromagnets provided to face the pair of armature assemblies and applies a magnetic attractive force to the pair of armature assemblies in response to the fault current on the circuit requiring an instant trip.

A single- or multi-pole power circuit-breaker, comprises main contacts, overload- and/or short-circuit current-actuated tripping means, an actuating mechanism for the main contacts, an arc chute and a pressure trip unit having a return element and an actuating element responsive to an overpressure in the arc chute. The tripping of the power circuit-breaker by a trip mechanism is executable both by the tripping means and the pressure trip unit. The pressure trip unit is arranged immediately adjacently to both the arc chute and a main busbar. A tripping lug mechanically engages with the trip mechanism such that an overpressure in the arc chute is transmitted virtually instantaneously to the pressure chamber. The actuating element is configured to switch over directly from a home position to a tripping position, against the force of the return element, in a case of overshoot of a pressure threshold value set by the return element.

An adjustable trip assembly is for an electrical switching apparatus. The electrical switching apparatus includes a housing, separable contacts and an operating mechanism for opening and closing the separable contacts. The adjustable trip assembly includes a load conductor, a magnetic assembly comprising a magnetic member and an armature movably coupled to the magnetic member, and a calibration assembly comprising a calibration bracket cooperating with the armature, and an adjustment mechanism being adjustable to move the calibration bracket and thereby adjust the position of the armature with respect to the magnetic member to calibrate the magnetic assembly. The magnetic assembly further includes a biasing element that biases the armature away from the magnetic member.

A circuit breaker includes a first electrical contact and a second electrical contact moveable between an open state and a closed state; an armature, wherein movement of the armature from a first position to a second position initiates the first electrical contact and the second electrical contact to move from the closed state to the open state; a first electromagnetic device configured to move the armature from the first position to the second position in response to being energized by a first signal; and a second electromagnetic device configured to move the armature from the first position to the second position in response to being energized by a second signal and in response to generation of the first signal and the first electrical contact and the second electrical contact still being in the closed state. Other circuit breakers and methods of operating circuit breakers are disclosed.

The present disclosure relates to an arc extinguishing device of a molded case circuit breaker which includes a fixed contactor fixedly provided on part of a base assembly case; a movable contactor brought into contact with or separated from the fixed contactor; and an arc extinguishing unit configured to extinguish an arc generated when the movable contactor is separated from the fixed contactor, and the arc extinguishing unit including a pair of side plates provided on the base assembly case; and a plurality of grids provided to have a predetermined distance between the pair of side plates, and the grid including a first grid formed with a first cutout portion on a first side surface where an arc is generated; and a second grid formed with a second cutout portion having a depth different from that of the first cutout portion on a second side surface where an arc is generated.