Circuit 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 overlay material of reduced electrical conductivity attached to the arc chute and residing in the cavity of the arc chute between the stationary and movable contacts. The overlay material can be a solid three-dimensional shaped insert/molded member with a cavity and/or an overmolded material directly attached to the metal arc chute.

A modular slot motor assembly and arc plate assembly combination for a circuit breaker is disclosed. The modular slot motor assembly is positioned proximate the arc plate assembly by lockingly securing it to a subcomponent housing in order to better provide an enhanced separation of the contact arms. During a short circuit event the modular slot motor assembly provides added acceleration to a moving contact arm. To protect the modular slot motor assembly from damage, an insulating casing is applied to at least a portion of the modular slot motor assembly.

This electrical circuit breaker includes at least one first fixed land, a support assembly equipped with at least one second land rotationally mobile, about a main axis, between a first position in which the second land is in contact with the first land and a second position in which the second land is separated from the first land and an arc-extinguishing chamber including a stacking of plates, a top arc-guiding horn, a bottom arc-guiding horn, equipped with at least one tab and a screen made of insulating material surrounding the bottom arc-guiding horn. The circuit breaker also includes two protuberances produced in a gas-producing material, which are mounted on the screen, arranged between the bottom horn and the top arc-guiding horn and facing the tab of the bottom arc-guiding horn, the protuberances having a prismatic or pseudo-prismatic form.

The invention relates to a single- or multi-pole switching device, in particular for DC applications, having at least one rotating switching element (2) which is connected to a drive, and also comprising switching contacts (4, 5), connection pieces (7) and connection poles or connection terminals (8) and a housing arrangement which accommodates the abovementioned parts. According to the invention, a movably guided rotary cylinder (2) is formed in the housing arrangement, said rotary cylinder being located in a body which is designed as a rotary cylinder holder (1). The rotary cylinder (2) has at least one contact pin (3) which passes radially or tangentially or eccentrically through the rotary cylinder and has, at its end, a contact piece (4) in each case. Mating contact pieces (5) are arranged in the rotary cylinder holder (1), said mating contact pieces being electrically connected to the connection pieces (7) or connection poles or connection terminals (8). A narrow, arc-influencing gap is present between the rotary cylinder (2) and the rotary cylinder holder (1), wherein, as a result of the movement of the rotary cylinder (2), the electrical connection between the contact pieces (4) and the mating contact pieces (5) can be broken by way of the contact pin (3) and the resulting disconnection arcs (11) enter the air gap subject to an extension and are rapidly extinguished there.

A slot motor is for an electrical switching apparatus. The slot motor includes: a support apparatus including a support element having a first leg and a second leg located opposite the first leg, the first leg having a first inner surface, the second leg having a second inner surface facing the first inner surface; a plurality of permanent magnets including a first permanent magnet and a second permanent magnet, the first permanent magnet being located on the first leg, the second permanent magnet being located on the second leg; and a number of U-shaped plates coupled to the support element. The first inner surface and the second inner surface are located between the first permanent magnet and the second permanent magnet.

A slot motor is for an electrical switching apparatus. The slot motor includes: a support apparatus including a support element having a first leg and a second leg located opposite the first leg, the first leg having a first inner surface, the second leg having a second inner surface facing the first inner surface; a plurality of permanent magnets including a first permanent magnet and a second permanent magnet, the first permanent magnet being located on the first leg, the second permanent magnet being located on the second leg; and a number of U-shaped plates coupled to the support element. The first inner surface and the second inner surface are located between the first permanent magnet and the second permanent magnet.

A breaker comprises a static contact, a moving contact, and an arc-extinguishing chamber. A contact surface of an electrical contact of the static contact and an electrical contact of the moving contact and a bottom plane of a base form an acute angle that is located in the first quadrant. The moving contact comprises a conducting rod having a projecting portion, and the electrical contact which is welded on an end surface of the projecting portion in a direction facing the electrical contact of the static contact. A bottom arc-ignition grid plate on the bottom of the arc-extinguishing chamber is arranged lower than the electrical contact of the static contact. A top arc-ignition grid plate on the top of the arc-extinguishing chamber is arranged higher than the maximum position of the electrical contact of the moving contact when the moving contact is opened.

The present disclosure relates to an arc extinguishing unit of a molded case circuit breaker and, more specifically to an arc extinguishing unit of a molded case circuit breaker, having improved arc elongation performance. The arc extinguishing unit of a molded case circuit breaker, according to one embodiment of the present disclosure, comprises: a first side plate and a second side plate arranged to be spaced a predetermined distance apart from each other; a plurality of grids arranged by predetermined intervals between the first side plate and the second side plate; and an insulation member arranged to adjoin each of the plurality of grids.

This electrical circuit breaker includes at least one first fixed land, a support assembly equipped with at least one second land rotationally mobile, about a main axis, between a first position in which the second land is in contact with the first land and a second position in which the second land is separated from the first land and an arc-extinguishing chamber including a stacking of plates, a top arc-guiding horn, a bottom arc-guiding horn, equipped with at least one tab and a screen made of insulating material surrounding the bottom arc-guiding horn. The circuit breaker also includes two protuberances produced in a gas-producing material, which are mounted on the screen, arranged between the bottom horn and the top arc-guiding horn and facing the tab of the bottom arc-guiding horn, the protuberances having a prismatic or pseudo-prismatic form.

The invention relates to a switching device which has two stationary contacts and a movable contact in a switching chamber. The stationary contacts are arranged next to each other along a longitudinal direction, and the switching chamber has a switching chamber wall with opposing transversal lateral wall parts and opposing longitudinal lateral wall parts. Each of the two stationary contacts is arranged at a distance to one of the transversal lateral wall parts, said distance being shorter than the respective distance to the longitudinal lateral wall parts.