An air circuit breaker is disclosed. The air circuit breaker according to an embodiment of the present disclosure includes a cover magnet unit. The cover magnet unit is directly coupled to an upper cover which forms the outer appearance of the air circuit breaker. The cover magnet unit is positioned adjacent to a fixed contact and forms a magnetic field. Due to the formed magnetic field, an electromagnetic force in a direction toward an arc extinguishing unit is applied to a generated arc. Accordingly, the generated arc may be rapidly moved and extinguished. The cover magnet unit is inserted into a surface of the upper cover and is not exposed to the outside. Therefore, the generated arc is not in contact with the cover magnet unit. As a result, the cover magnet unit is not damaged by the generated arc.

An extinguishing chamber of magnetic blow-out type for a breaking device includes a field source, a magnetic carcass and a breaking region, in which an electric arc is liable to form when a breaking pole belonging to the breaking device is opened. The field source is arranged to generate a magnetic field intended to move the electric arc in order to stretch it and accelerate its cooling and its extinguishing. The carcass is arranged to channel the magnetic field. The carcass is stood up against the field source and closes in front thereof so as to create an air gap in the magnetic circuit formed by the field source and the carcass and to thus maximize the magnetic field that passes through the breaking region.

An arc extinguishing unit and an air circuit breaker comprising same are disclosed. An arc extinguishing unit, according to an embodiment of the present disclosure, comprises an extinguishing magnet unit that forms a magnetic field inside the arc extinguishing unit. Accordingly, a generated arc receives an electromagnetic force in the direction facing the exterior of the air circuit breaker, and thus can be rapidly moved and extinguished. The extinguishing magnet unit is accommodated in a magnet case. The magnet case can seal the extinguishing magnet unit. Therefore, the extinguishing magnet unit is not damaged by the generated arc.

An improved switching or contactor device with high arc extinguishing capabilities industrial and railways applications where a high current must be switched on and off is provided. The switching or contactor device includes, in a casing, a switch base portion including electrical switching means of a low voltage driving portion active on moving contacts; a high voltage portion including the moving contacts driven towards and away from each other with respect to a mutual contact position, said moving contacts being mounted at respective contact ends of a toggle mechanism which is movable by a low voltage driving portion, and a top arc chute extinguishing portion covering the high voltage portion.

A switch includes a first switch (100) including a first fixed contact (111) and a first movable contact (121) and a second switch (200) including a second fixed contact (211) and a second movable contact (221). The first fixed contact (111) and the first movable contact (121) come into contact and the second fixed contact (211) and the second movable contact (221) come into contact to turn on the switch. A magnet (320) is installed between the first switch (100) and the second switch (200).

A contact mechanism includes an opening/closing fixed contact, an opening/closing movable contact opposed to the opening/closing fixed contact, and a permanent magnet configured to extend an arc that occurs between the opening/closing fixed contact and the opening/closing movable contact in a predetermined direction. In particular, an arc that occurs from contact surface regions where the opening/closing fixed contact and the opening/closing movable contact make contact with each other is extended by a magnetic force of the permanent magnet and moved to non-contact surface regions where the opening/closing fixed contact and the opening/closing movable contact make no contact with each other.

An electrical contact switch chamber is disclosed. The electrical contact switch chamber includes two contacts, a wall having a base and sides surrounding the two contacts, and at least one insulation slot having an opening extending transversely relative to a direction between the contacts. The at least one insulation slot is disposed along a portion of the wall between the two contacts.

A compact disconnect device includes a magnetic arc deflection assembly including at least one set of stacked arc plates and at least one magnet disposed adjacent switchable contacts and establishing a magnetic field across the stacked arc plates. The magnetic arc deflection assembly facilitates reliable connection and disconnection of DC voltage circuitry well above 125 VDC with reduced arcing intensity and duration. The disconnect device may be a compact fusible switch disconnect device having dual sets of switch contacts in the same current path.

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 DC electrical circuit breaker includes first and second movable electrical contacts. The circuit breaker includes a magnetic circuit including a magnet and generating a magnetic field able to guide an electrical arc in the direction of a quenching chamber, and having for this purpose curved field lines extending perpendicularly to opposite lateral walls of an electrical arc formation chamber, these field lines converging, in a central region of the arc formation chamber containing the contact zones, toward the quenching chamber while extending parallel to the longitudinal plane.