Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A circuit breaker comprises a pair of separable contacts arranged in an opening volume. A plurality of flat de-ionization fins are arranged inside an arc extinguishing chamber opening out onto the opening volume. The chamber is bounded by two opposite side walls, a rear wall located away from the opening volume, a bottom wall and a top wall. Each fin has a free attack edge exposed to the arc. The free edges of the fins laterally bound a longitudinal gulley extending in a heightwise direction from the bottom electrode to the top wall, and longitudinally from a first longitudinal end opening out onto the opening volume at a second longitudinal end tapering to form a stack near to the rear wall, passing via a narrow intermediate portion. A bottom longitudinal electrode partially covers the bottom wall and extends longitudinally facing the gulley at least from the second contact up to the stack.