An electric arc extinction chamber comprises a stack of electric arc splitter plates. The splitter plates define an inlet of the extinction chamber that is to be present facing electric contacts, and a back of the extinction chamber. At least one permanent magnet is present inside the extinction chamber in a central zone in the width direction of the extinction chamber and beside the back thereof. The magnet presents magnetization having a non-zero component along an axis extending between the inlet and the back of the extinction chamber.

Circuit interrupters such as breakers with a metal arc chute having a base and sidewalls extending outward from the base forming an open cavity, a movable arm holding a movable contact adjacent to the arc chute, a line conductor electrically connected to a stationary contact residing adjacent to the arc chute facing the movable contact and a three-dimensional molded arc quenching insert attached to the metal arc chute, and residing in the cavity of the metal arc chute between the stationary and movable contacts. The insert has an arc quenching material that optionally releases a gas such as hydrogen during an arcing event.

An air circuit breaker includes two separable electrical contacts connected to electric current input and output terminals; and a chamber for quenching an electric arc, including a stack of splitter plates that are spaced apart from one another, and lateral walls placed on either side of the stack and including a thermosetting-resin impregnated polyamide woven and being devoid of glass fibres. The quenching chamber furthermore includes protective elements made of crosslinked polyamide, the elements being placed in junction zones between the lateral walls and holding plates, the protective elements covering corners of the splitter plates, which corners are adjacent to the lateral walls, so as to separate these corners of the splitter plates from the electrical contacts.

Circuit interrupters such as breakers with a metal arc chute having a base and sidewalls extending outward from the base forming an open cavity, a movable arm holding a movable contact adjacent to the arc chute, a line conductor electrically connected to a stationary contact residing adjacent to the arc chute facing the movable contact and a three-dimensional molded arc quenching insert attached to the metal arc chute, and residing in the cavity of the metal arc chute between the stationary and movable contacts. The insert has an arc quenching material that optionally releases a gas such as hydrogen during an arcing event.

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.

The present invention provides an arc extinguishing structure for direct current circuit breaker, which comprises an arc extinguishing chamber (3) installed on a second casing (2), with a lateral opening (30) which opens towards the first casing (1); a gas generating hood (4) installed at a lower part inside the arc extinguishing chamber (3) and comprising two gas generating plates (41, 42) that are disposed opposite to each other, with a shield plate (43) disposed opposite to the lateral opening (30) and adjacent the second casing (2); a movable contactor (5) and a stationary contactor (6) installed inside an internal installation space (10), with the disconnecting portion between the movable contactor (5) and the stationary contactor (6) being located inside an accommodation space (40) and close to the shield plate (43), so that when the movable contactor (5) becomes disconnected from the stationary contactor (6) and an electric arc is produced, the electric arc triggers the gas generating plates (41, 42) and the shield plate (43) to generate a lot of gas which pushes the electric arc to move in a direction away from the shield plate (43); a plurality of arc extinguishing grid-plates (7) installed at an upper part inside the arc extinguishing chamber (3), having lower slots (71) which are open towards the accommodation space (40) and have a size that gradually decreases along a direction from the second casing (2) to the first casing (1), so that the electric arc during its moving process is continuously blocked by the arc extinguishing grid-plates (7) with increasingly smaller sizes of lower slots (71), and as a result, the electric arc cannot come out from the lateral opening (30) of the arc extinguishing chamber (3), but instead can only enter the spaces between the arc extinguishing grid-plates (7) and thus get extinguished as quickly as possible.

Provided is a circuit breaker with a single pole breaking unit including a housing, a movable contact provided in the housing, a fixed contact provided in the housing and contacting or separated from the movable contact, and an extinction unit provided in the housing and configured to extinguish an arc generated when the movable contact and the fixed contact are separated. At least one arc gas discharge passage is formed in the housing to allow an arc gas generated when the movable contact and the fixed contact are separated to be discharged.

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 arc extinguishing device of a DC circuit breaker is proposed. The arc extinguishing device is provided with electromagnets installed on opposite sides of an arc extinguishing chamber, so as to increase arc resistance, thereby quickly extinguishing an arc. The arc extinguishing device includes: an arc extinguishing chamber installed above contact terminals and provided with an internal space formed open up and down; a plurality of grids installed side by side in the internal space of the arc extinguishing chamber; a cover installed on an upper part of the arc extinguishing chamber, and including a filter for filtering out impurities remaining in an arc which is extinguished in the arc extinguishing chamber; and electromagnets installed on the one side and the other side of the internal space of the arc extinguishing chamber.

The present disclosure relates to an arc extinguishing assembly, including side members which are spaced apart by a certain distance and disposed to face each other; an exhaust which is installed at an upper part of the side member; a plurality of grids which are installed between the side members and having both ends fixed to each of the side members; and an arc guide whose one side is coupled to the side member and which is installed at a lower part of the plurality of grids, wherein the arc guide is made of a material having heat resistance, and a circuit breaker including the same.