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.

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.

The present disclosure relates to an extinguishing unit for a molded case circuit breaker, and more particularly, to an extinguishing unit for a molded case circuit breaker that has grids double-arranged in an extinguishing part to improve arc extinguishing performance. According to an embodiment of the present disclosure, an extinguishing unit for a molded case circuit breaker includes a pair of side plates arranged to face each other and a plurality of grids arranged in a space defined between the pair of side plates, wherein the grids include a plurality of first grids arranged at a front portion of the pair of side plates; and a plurality of second grids arranged at a rear portion of the pair of side plates, wherein a re-division space for re-dividing an arc is defined between the first grids and the second grids.

An arc path forming part and a direct-current relay are disclosed. An arc path forming part according to an embodiment of the present invention comprises: a magnet frame extending in the length direction; and a plurality of main magnet portions placed in the length direction. The respective opposing surfaces of the main magnet portions facing each another have the same polarity. Therefore, magnetic fields in the direction of pushing away from each other are generated in a space between the respective main magnet portions. Due to the magnetic fields, an electromagnetic force in the direction toward the outside of the arc path forming part is formed. Accordingly, the generated arc is moved in the direction of the electromagnetic force and can be stably extinguished. Therefore, various members positioned in the central part of the direct-current relay are prevented from damages caused by the arc.

A removable electric current switching element includes a housing including a first bottom plate and a second bottom plate opposite to one another. The housing includes insulating walls which extend around electrically mobile contacts from the second bottom plate and in a direction perpendicular to the second bottom plate. The housing also includes protection walls which at least partially cover internal faces of the insulating walls, these protection walls being formed of a single piece with the second bottom plate.

A debris barrier is for an electrical switching apparatus. The electrical switching apparatus includes separable contacts and an arc chute. The separable contacts generate debris when tripping open in response to an electrical fault. The arc chute has a plurality of splitter plates each having an edge portion and a distal portion located opposite and distal the edge portion. The debris barrier includes a first leg, a second leg, and a middle portion connecting the first leg and the second leg. The middle portion is coupled to one of the separable contacts. At least one of the first leg and the second leg has a first barrier portion and a second barrier portion extending therefrom. The first barrier portion is located proximate the distal portion. The second barrier portion extends from the first barrier portion toward the edge portion in order to redirect the debris toward the edge portion.

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.

Described herein is a switch pole for a low voltage switching device including an insulating casing defining an internal space with a contact area and an arc-extinguishing area of the switch pole, a fixed contact assembly and a movable contact assembly positioned in the contact area and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled, and an arc chamber positioned in the arc-extinguishing area that includes a plurality of parallel arc-breaking plates. The insulating casing includes an insulating wall partially separating the contact area from the arc-extinguishing area and a channel connects the contact area to the arc-extinguishing area. The switch pole further includes an additional arc-breaking element anchored to the insulating wall, passing through the channel of the insulating wall and arranged in electrical connection with a terminal arc-breaking plate of the arc chamber.

A switchgear for an electric current includes a switching assembly that can be switched between an open state and a closed state; a control mechanism including a trigger member for triggering the switching of the switching assembly to the open state; a housing including lateral walls. The lateral walls are elastically deformable when the pressure prevailing inside the housing increases, one of the lateral walls including, on its inner face, a rigid protuberance, the deformation of the wall causing a displacement of the protuberance, the protuberance being arranged relative to the trigger member such that its displacement results in the displacement of the trigger member to its triggering position.

An electrical breaking module includes a non-magnetic, electrically insulating casing housing, a fixed contact and a movable contact defining between them a breaking zone in which an electric arc extends at its origin when the electrical circuit is opened. A magnetic blow-out device is provided with at least one magnetic field source arranged in a breaking chamber, opposite the breaking zone to move and stretch the electric arc in a direction substantially perpendicular to the breaking plane towards the housing. The magnetic blow-out device also includes a non-magnetic, electrically insulating deflector, arranged in the breaking chamber to occupy most of the space between the breaking zone and the casing, so as to create at least one arc confinement zone, in which the electric arc when magnetically blown is deflected and constrained to promote its cooling and extinction.