An arc extinguishing unit and an air circuit breaker comprising same are disclosed. The arc extinguishing unit according to an embodiment of the present disclosure comprises an arc extinguishing magnet located above a grid. The arc extinguishing magnet forms a magnetic field in the arc extinguishing part and in a fixed contact and a movable contact that are located adjacent to the arc extinguishing part. An arc generated as the fixed contact and the movable contact are separated from each other receives an electromagnetic force in the formed magnetic field. The electromagnetic force passes through the grid and is formed in a direction facing the exterior of the arc extinguishing part. Thus, the generated arc may be quickly extinguished and moved.

A switching device including a switching chamber, in which a stationary switching piece is arranged opposite a movable switching piece, where the stationary switching piece is placed on a plastic carrier part and this component combination of stationary switching piece and plastic carrier part is configured as an exchangeable switching piece assembly.

A multi-finger circuit breaker includes a moving contact assembly having a carrier body, a first plurality of fixed breaking contacts, a first plurality of movable contacts, a plurality of first fingers, at least one second finger longer in length to a length of a first finger of the plurality of first fingers, a plurality of splitter plates disposed adjacent to the plurality of first fingers and the at least one second finger and a slot motor disposed adjacent to the plurality of first fingers and the at least one second finger. The slot motor is configured to provide a first magnetic field force to amplify a second magnetic field force being applied on the second finger to influence an arc between the first plurality of fixed breaking contacts and the first plurality of movable contacts during a short circuit such that to move the arc away from between the first plurality of fixed breaking contacts and the first plurality of movable contacts and dissipate energy of the arc.

A housing assembly is for an electrical switching apparatus. The electrical switching apparatus includes an arc chute and a collar. The housing assembly comprises: a plurality of housing members comprising a first base member and a second base member, the first base member being structured to receive the collar, the second base member being coupled to the first base member and being structured to receive the arc chute. The first base member is made from a first material and the second base member is made from a second, different material.

A method of manufacturing a power contactor from an existing contactor having a magnetic amplifier that comprises a blowout coil and a ferromagnetic core, and an arc chute for extinguishing an arc generated by opening the existing contactor under a current load is disclosed. The method includes removing a bolt assembly from the existing contactor and at least one side plate from the existing contactor. The method also includes removing the ferromagnetic core from the existing contactor.

A housing assembly is for an electrical switching apparatus. The electrical switching apparatus includes an arc chute and a collar. The housing assembly comprises: a plurality of housing members comprising a first base member and a second base member, the first base member being structured to receive the collar, the second base member being coupled to the first base member and being structured to receive the arc chute. The first base member is made from a first material and the second base member is made from a second, different material.

A switching device including a switching chamber, in which a stationary switching piece is arranged opposite a movable switching piece, where the stationary switching piece is placed on a plastic carrier part and this component combination of stationary switching piece and plastic carrier part is configured as an exchangeable switching piece assembly.

A direct-current contactor includes a contact assembly, an arc extinguishing assembly, and a drive assembly. The arc extinguishing assembly is disposed around the contact assembly. The contact assembly includes a moving contact mechanism and a stationary contact mechanism that are disposed in pairs. The moving contact mechanism includes a moving contact. The stationary contact mechanism includes a stationary contact and an arc introducing plate disposed around the stationary contact. The arc introducing plate is configured to introduce an electric arc generated between the moving contact mechanism and the stationary contact mechanism into the arc extinguishing assembly. The drive assembly is configured to drive a connection or a disconnection of the moving contact and the stationary contact.

An aspect of the present disclosure is drawn to an electronic switch module including: a housing having a chute; a plunger member moveably mounted within the chute so as to be able to move along a first axis with a first velocity; a magnet member disposed within the housing; a Hall sensor disposed within the housing; and a displacement mechanism disposed within the housing and operable to displace the magnet member along a second axis with a second velocity by a distance away from the Hall sensor, wherein the first velocity is greater than the second velocity, and wherein the Hall sensor is operable to output a signal associated with a first location of the plunger member along the first axis based on a second location of the magnet member along the second axis.