An operating mechanism of a circuit breaker includes a moving contact bracket, a moving contact assembly, and a reset torsion spring. The moving contact bracket is provided with a rotating shaft, and the moving contact bracket may be rotated around the rotating shaft; a first end of the reset torsion spring is arranged on a base of the circuit breaker, and a second end of the reset torsion spring is arranged on the moving contact assembly; the moving contact assembly is rotatably arranged on the moving contact bracket, and the moving contact bracket is provided with a limiting portion, so that in a closing process of the circuit breaker, the moving contact assembly is pressed against the limiting portion and rotated synchronously with the moving contact bracket, and the reset torsion spring applies a force rotated towards a disconnection direction of the circuit breaker to the moving contact bracket.

A solid-state circuit breaker comprises a breaker housing and an air gap driving mechanism that is a permanent magnet based. The air gap driving mechanism includes a pair of opposing contacts, a first permanent magnet to generate a static magnetic field and a coil actuator to generate a dynamic magnetic field. The first permanent magnet and the coil actuator are positioned relative to each other such that the dynamic magnetic field generated by the coil actuator can either enhance or cancel the static magnetic field of the first permanent magnet. Hence a combination of the static magnetic field from the first permanent magnet and the dynamic magnetic field from the coil actuator can either drive the pair of opposing contacts open or drive the pair of opposing contacts close.

A crossbar assembly and a trip assembly comprising same are disclosed. The crossbar assembly according to an embodiment of the present disclosure comprises a crossbar and an instant bar. The crossbar and the instant bar can be rotatably coupled so as to be rotatable around the same rotary shaft. Therefore, the space required for rotation can be reduced to be less than when the crossbar and the instant bar are individually rotated. In addition, the crossbar can move in a longitudinal direction when coupled to the instant bar. Therefore, a metallic bar for movement of the crossbar is unnecessary. Therefore, interference between different-phase currents flowing through the trip assembly can be minimized.

This application discloses a circuit breaker and a power distribution box, and relates to the field of communication device technologies. The circuit breaker includes a housing, a control apparatus, and a current signal collection mechanism, an operating mechanism, and a contactor mechanism that are disposed in the housing. The current signal collection mechanism has a first fixed contact and a second fixed contact that are electrically connected. The operating mechanism has a rotating part and a first moving contact. The first moving contact is electrically connected to a first electrode cable inlet port of the circuit breaker. Rotating the rotating part may make a circuit between the first moving contact and the first fixed contact connected/disconnected.

Provided is a rotary maintenance type leakage protector which relates to a technical field of leakage protectors, and the rotary maintenance type leakage protector includes: a base, a leakage protection device, and an upper cover. The leakage protection device includes a reset key, a return rotation stopper, an electromagnetic driven device and an elastic piece, wherein the base is further provided with a conducting terminal that can be electrically connected with the elastic piece; each side of the return rotation stopper is provided with a protruding end that can be abutted against the elastic piece; the electromagnetic driven device is disposed on a side of an upper part of the base, and the electromagnetic driven device is provided with a driven iron core and can drive the driven iron core to move.

An electromagnetic trip unit, wherein: the electromagnetic trip unit includes a movable core, an upper static core and a lower static core; the movable core can move relative to the upper static core and the lower static core in the upper static core and the lower static core; a movable core body end of a movable core body of the movable core faces and approaches the lower static core end of the lower static core, when the electromagnetic trip unit is not released, a first magnetic field air gap is formed between the movable core body end and the lower static core end; the movable core body of the movable core is also provided with a movable core body step, when the electromagnetic trip unit is not released, a second magnetic field air gap is formed between the movable core body step and the lower static core end.

Provided is a rotary maintenance type leakage protector which relates to a technical field of leakage protectors, and the rotary maintenance type leakage protector includes: a base, a leakage protection device, and an upper cover. The leakage protection device includes a reset key, a return rotation stopper, an electromagnetic driven device and an elastic piece, wherein the base is further provided with a conducting terminal that can be electrically connected with the elastic piece; each side of the return rotation stopper is provided with a protruding end that can be abutted against the elastic piece; the electromagnetic driven device is disposed on a side of an upper part of the base, and the electromagnetic driven device is provided with a driven iron core and can drive the driven iron core to move.

Disclosed herein are efficient mechanical fuse devices that are capable of functioning at high current levels. These devices comprise mechanical features configured such that the fuse devices have a non-triggered state, which allows current to flow through the device, and a triggered state, which does not allow current to flow through the device. In some embodiments, the devices are configured such that a certain pre-determined current level flowing through the device will generate a sufficient electromagnetic field to cause the mechanical elements to transition the fuse device into the triggered state and thus interrupt a connected electrical circuit, device or system. In some embodiments, these devices can also comprise hermetically sealed components. In some embodiments, the fuse devices can comprise pyrotechnic features.

A multi-level feedback actuator assembly for a circuit breaker assembly includes a rotary solenoid, an electric actuator assembly and a manual actuator assembly. The electric actuator assembly includes a switch assembly with an actuator. The manual actuator assembly includes a number of primary actuators, a linkage assembly, and a cam assembly. The number of primary actuators includes a first actuator with a body. The first actuator body is structured to move over a path having at least a first portion and a second portion. The rotary solenoid is operatively coupled to the linkage assembly. The linkage assembly is further operatively coupled to an operating mechanism crossbar. In this configuration, the linkage assembly is structured to apply at least a first bias and a second bias to the first actuator body. Further, the first bias is noticeably different from said second bias.

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.