A medium voltage switching pole includes: a fixed contact of a vacuum interrupter; a movable contact of the vacuum interrupter; a piston; at least one electrical contact; a first terminal; and a second terminal. The fixed contact is fixedly connected to the first terminal. The movable contact is fixedly connected to the piston. The piston moves within the second terminal along an axis. The at least one electrical contact makes an electrical connection between the piston and the second terminal. An outer surface of the piston and an inner surface of the second terminal are arranged such that: when in an open configuration the fixed contact and movable contact are separated, at least one first radial line perpendicular to the axis extends through locations of the at least one electrical contact, and a first distance along the at least one first radial line extends from the outer surface.

A method for producing an electrical switch contact arrangement for a vacuum circuit breaker includes the following steps: a) providing two electrical contact pieces made of copper or a copper alloy; b) coating the electrical contact pieces with aluminum or an aluminum alloy, the coating of the contact pieces taking place by means of a cold gas spraying method; c) welding each of the sides coated in method step b) to a current transfer contact; and d) arranging the units obtained in method step b) inside the vacuum circuit breaker. There is also described an electrical switch contact arrangement for a vacuum circuit breaker with the contact pieces produced by the method according to the invention.

The present disclosure provides a plug interlock device for a circuit breaker, comprising: a lever-type withdrawable interlock assembly provided at a transfer car so that inputting and withdrawal of a breaker main body can be locked; a plug connector assembly, which rises/lowers in response to insertion or separation of a control line plug into or from a connector provided at the upper part of the breaker main body; a shaft, which rotates in different directions according to the elevation of the plug connector assembly by connecting one side thereof to the lower end of the plug connector assembly; and a blocking plate connected to the other side of the shaft so as to lock or unlock the operation of the lever-type withdrawable interlock assembly while horizontally moving according to the rotation of the shaft.

A circuit breaker includes a capacitive voltage sensor located within its insulating casing. The voltage sensor includes a capacitor located between the terminals of the circuit breaker adjacent a low potential surface provided by a coil of a current sensor. The capacitor is dome shaped. The voltage sensor does not appreciably increase the size or weight of the circuit breaker and is reliable and accurate.

A switching device, including: a main switch configured to be displaced between a closed position of a main circuit and an open position, a vacuum interrupter including: a fixed electrode, a mobile electrode, configured to be displaced between: a first, so-called closed, position and a second, so-called open, position, in which the electrodes are apart, a palette configured to make the mobile electrode switch over from the first position to the second position and comprising an electrically conductive plate, the main switch being configured to drive the palette via the plate, a connection wire electrically linking the plate and the mobile electrode, the wire being in electrical contact with a tube disposed in an accommodating recess of the plate,
wherein the accommodating recess comprises a wall exerting an elastic holding force on the tube.

An arc shield surrounding an outer peripheral side of a fixed electrode and a movable electrode is provided, in addition to a fixed-side insulating unit in which a fixed-side insulator is provided to be connected coaxially with the arc shield on the fixed side in the axial direction of the arc shield, and a movable-side insulating unit in which movable-side insulators are provided to be connected coaxially with the arc shield on the movable side in the axial direction of the arc shield. The movable-side insulating unit has an insulator group in which movable-side insulators are provided to be connected in the axial direction, an insulator-group-side sub shield surrounding the outer peripheral side of a movable-side energizing shaft, and an insulator-group-side sub shield support part which is on the outer peripheral surface of the insulator-group-side sub shield and interposed between two adjacent movable-side insulators of the insulator group.

A plug interlock apparatus for a vacuum circuit breaker, comprising: a control power plug having a plug fixing member formed on each side thereof; a switchboard including a plurality of terminals; a control power connector from which the control power plug is detached; a plug latch formed on the sides of the control power connector and fixing the plug fixing members; a circuit breaker body which includes a connector rotation link which rotates in association with the plug latch, and a slide link having one end coupled to the connector rotation link, and which is detached from the terminal and supplied with voltage and current; and a transfer cart for reciprocating the circuit breaker body along a rail installed on the bottom surface of the switchboard, wherein a locking latch detached from a rail groove formed on the rail is formed at the other end of the slide link.

An electrical connector includes: a housing including a mechanical interface, the mechanical interface configured to mechanically connect the electrical connector to a bushing; a current path in the housing, the current path including: an electrical conductor; and a switching apparatus electrically connected to the electrical conductor, the switching apparatus associated with operating states, the operating states including at least a first state that closes the current path and a second state that opens the current path; a switch control apparatus in the housing, the switch control apparatus configured to control the operating state of the switching apparatus; and a power apparatus in the housing, the power apparatus configured to obtain electrical energy from the current path and provide electrical energy to the switch control apparatus.

A current interruption module includes: a resettable switching apparatus associated with operating states, the operating states including at least a first operating state that prevents current flow in the switching apparatus and a second operating state that allows current flow in the switching apparatus; a switch control configured to control the operating state of the switching apparatus; an electrical interface configured to electrically connect the switching apparatus to a load; and a connection interface configured to electrically connect the resettable switching apparatus to a current path of an separate and distinct electrical connector and to mechanically connect the current interruption module to the separate and distinct electrical connector.

A vacuum interrupter including a vacuum bottle, a fixed contact extending through one end of the vacuum bottle and a movable contact positioned within the vacuum bottle relative to the fixed contact so that a gap is defined between the fixed contact and the movable contact when the vacuum interrupter is open and the fixed contact and the movable contact are in contact with each other when the vacuum interrupter is closed. An insulated drive rod is rigidly coupled to the movable contact opposite to the fixed contact and a circular flexible conductor is coupled to the movable contact and flexes when the movable contact is moved by the drive rod. The flexible conductor can be, for example, a laminate structure including a plurality of stacked conductive laminates each having a plurality of spirals separated by gaps or a linear spring trampoline conductor.