A high- or medium-voltage circuit breaker, in which a movable contact (1) is moved in sliding in order to separate stationary contacts (11, 12) from its sliding surface (2). In accordance with the invention, the stationary contacts (11, 12) have switching portions (9) that separate from the movable contact more or less simultaneously as a result of a setback (19) in the movable contact (1), thereby causing two simultaneous switching arcs to appear (14, 15), which arcs are extinguished much more quickly than a single arc, before the current is transferred to the conventional arcing contacts (5). This disposition enables the stationary contacts (11, 12) and their environment to be less exposed to damage.

A superconducting arcing induction type DC circuit breaker includes a superconducting fault current limiter and an arcing induction type DC circuit breaker connected in series to each other. The arcing induction type DC circuit breaker includes an induction member that has a through-hole, is continuously formed in a 360-degree direction, and has a certain shape and thickness, and an induction needle that protrudes from an inner surface of the induction member toward a center of the induction member. A contact point where an anode and a cathode, which are mechanical contacts, approach from opposite directions and come into contact with each other is formed in the through-hole of the induction member, and the anode and the cathode are separated in a direction far away from each other. The induction needle induces arc generated upon contact opening when the anode and the cathode are separated from each other in the event of system accident of DC power or AC power, and the induction member quenches the induced arc by the flow of the induced arc to ground through a ground line.

The present invention relates to a rotary switch. In particular, the rotary switch includes a main contactor having a main contact carrier and a main cam, a shaft rotatably journaled in the main contactor and extending axially through the main contactor, and an auxiliary contactor. When the switch is rotated from the ON position to the OFF position, the shaft rotates to break open auxiliary contacts before main contacts break open upon further rotation of the shaft.

The present invention relates to a rotary switch. In particular, the rotary switch includes a main contactor having a main contact carrier and a main cam, a shaft rotatably journaled in the main contactor and extending axially through the main contactor, and an auxiliary contactor. When the switch is rotated from the ON position to the OFF position, the shaft rotates to break open auxiliary contacts before main contacts break open upon further rotation of the shaft.

A key structure includes a first movable plate, a second movable plate, a keycap, a first linkage lever and a second linkage lever. The second movable plate is disposed over the first movable plate. The keycap is disposed over the second movable plate. The first linkage lever is connected with the keycap and the first movable plate. The second linkage lever is connected with the keycap and the second movable plate. While the first movable plate is moved in a first direction and the second movable plate is moved in a second direction, the first linkage lever and the second linkage lever are moved in different directions, so that a height of the keycap is reduced.

An insulating housing with integrated functions comprises a barrel-shaped shell, an interior wall of which being provided with a protruded or recessed uneven texture configured to increase a creepage distance between both axial ends of the barrel-shaped shell, the path of the creepage distance formed by the protruded or recessed uneven texture having more than two flyover or bypass sub-paths, such that the creepage distance is increased, and the voltage withstanding is increased. Meanwhile, by employing a construction of creepage-increasing rings, not only the creepage distance is increased greatly, but also the barrel-shaped shell is avoided from full-interior wall contamination by metal vapor evapotranspiration. Thus, under the double effects of a greater creepage distance and a greater proportion of uncontaminated area, the voltage withstanding and after arcing insulation level of the insulating housing with integrated functions are improved greatly, while the after arcing electric insulation level of the vacuum interrupter is not decreased, such that the insulating housing with integrated functions and the vacuum interrupter is developing towards high voltage and ultra-high voltage.

A “five-prevention” interlocking pole type high-voltage switchgear includes a pole bracket, embedded poles, and spring and earthing isolated switch operating mechanisms; every three poles are arranged in a row on the bracket, the spring operating mechanism is joined with the switch operating mechanism through the chamber door interlocking piece and mechanism interlocking piece; the chamber interlocking piece, mechanism interlocking piece and door lock plate are joined, the door lock plate is opposite the opening semi-axis pinch plate in the spring operating mechanism and the door lock plate is set with a door lock pin. Chamber interlocking piece movement is used to open or close the switch operating mechanism crank operation hole and corresponds to the start of close brake operation and limit brake of opening pinch plate in the spring operating mechanism and the limiting and opening of the opening semi-axis and cable chamber door in the spring operating mechanism.

A switching device arrangement has a first contact set and a second contact set. The first contact set includes a first electric arc contact element and a first nominal current contact element. The first nominal current contact element can be moved relative to the first electric arc contact element. A first transmission is introduced in a kinematic chain in order to generate a relative movement of the first nominal current contact element and the first electric arc contact element. The first transmission is operationally connected between a stationary counter bearing and the first electric arc contact piece.

An automatic transfer switch for a power system receiving multiple alternating current sources and delivering multiple alternating current output is described. A transfer switch control circuit can sense a power loss in one or both AC sources. Each power supply can deliver current to drive a load but, if one of the power supplies fails, the other can supply power to drive both loads.

An embodiment relates to a method for closing a switch and a switch for performing the method, the switch having a stationary switch contact including a stationary contact face, a movable switch contact including a movable contact face parallel to the stationary contact face and lying under pressure against the stationary contact face in the closed state, and an elastic transversal offset of the contact faces which ensures that pressure is applied when the contact surfaces lie against each other. To guarantee closing during a short-circuit, a displaceable counter-pressure element is provided which presses against the movable contact face in the open position and at least reduces the transversal offset. The counter-pressure element moves in conjunction with the movable switch contact towards the closed position when the switch closes. The counter-pressure element stops moving during the closing movement, while the movable contact face continues to move into the closed position.