The present invention provides a DC circuit breaker combining magnetic induction transfer and resistance current limiting, the circuit breaker comprising: a main current circuit, a current-limiting branch, a breaking branch, and an energy dissipation branch; the current-limiting branch and the breaking circuit each comprises a magnetic induction transfer module; an inductor in the magnetic induction transfer module of the current-limiting branch and a branch inductor in the current-limiting branch are coupled to form a mutual inductor; an inductor in the magnetic induction transfer module of the breaking branch and a second inductor in the transfer current loop are coupled to form a mutual inductor. The present invention can limit the current rising speed and amplitude and completely turned off the short-circuit current, thereby reducing the size and manufacturing cost of the circuit breaker. The main loop capacitance needs not be pre-charged; isolation between a secondary charging circuit and the main loop is realized; the discharging capacitance of the magnetic induction transfer modules adopt a bridge structure, which may two-way limit and break the fault current.

A high-voltage circuit breaker comprises a first main contact and a second main contact extending along a central longitudinal axis and being at least partially enclosed by an insulator, wherein the insulator has an inner surface facing the central longitudinal axis and being arranged at a first distance from the central longitudinal axis, and further comprises at least one particle trap for trapping particles generated during operation of the circuit breaker, wherein the particle trap has an inner surface facing the central longitudinal axis and being arranged at a second distance from the central longitudinal axis, the second distance being larger than the first distance.

A high-voltage circuit breaker comprises a first main contact and a second main contact extending along a central longitudinal axis and being at least partially enclosed by an insulator, wherein the insulator has an inner surface facing the central longitudinal axis and being arranged at a first distance from the central longitudinal axis, and further comprises at least one particle trap for trapping particles generated during operation of the circuit breaker, wherein the particle trap has an inner surface facing the central longitudinal axis and being arranged at a second distance from the central longitudinal axis, the second distance being larger than the first distance.

A disconnector is provided for electrical lines with high current and high short-circuit value, comprising two mutually spaced fixed structures, each for connection to a respective portion of an electrical line, and a movable connection assembly, which is supported by a first one of the two fixed structures with means for the movement of the movable connection assembly toward the second one of the two fixed connection structures. Each one of the fixed connection structures comprises a tubular jacket, for support and conduction, which supports at one end, annular contact elements arranged for movable coupling with a corresponding moving contact of the movable connection assembly, and at the opposite end, couplings for connection to the corresponding portion of electrical line. The movable connection assembly comprises at least two moving contacts carried within the first fixed connection structure by a supporting frame connected to the movement means.

A switch capable of easily accomplishing current cutoff roles required for a high-voltage switch, and which has a short breaking time. The switch includes pressure housings filled with an insulative medium, a plurality of contactors each including a contact, a plurality of operation units actuating the contacts, an insulative spacer dividing the interiors of the pressure housings into the same number of internal spaces as the number of contacts, and an electrode passing completely through the insulative spacer and fastened to the insulative spacer. The contactor is provided one by one for each internal space, and all contacts are electrically connected in series via the electrode, and the operation units actuate the corresponding contacts, respectively.

Embodiments are directed to an over-current protection assembly that includes a mechanism having a first operating element and a second operating element. The first operating element is coupled to a first set of individual contacts. The second operating element is coupled to a second set of individual contacts. A single movement of the first operating element relative to the second operating element breaks a plurality of electrical contacts or paths between the first set of individual contacts and the second set of individual contacts.

An arc bypass assembly for use in a circuit breaker includes: an arc chute including a base, two arc sides extending from the base, and a plurality of arc plates arranged within the two arc sides, the arc chute structured to dissipate an arc upon opening of primary contacts of the circuit breaker during a high current event; an arc horn extending outwardly from a first edge of the base of the arc chute toward a primary stationary contact coupled to a line-in conductor, the arc horn structured to attract the arc; and an arc bypass wire coupled to the base of the arc chute at one end and to a secondary stationary arm of the circuit breaker at another end, where the arc bypass assembly is structured to redirect a portion of current generated during the high current event to the load.

An arc bypass assembly for use in a circuit breaker includes: an arc chute including a base, two arc sides extending from the base, and a plurality of arc plates arranged within the two arc sides, the arc chute structured to dissipate an arc upon opening of primary contacts of the circuit breaker during a high current event; an arc horn extending outwardly from a first edge of the base of the arc chute toward a primary stationary contact coupled to a line-in conductor, the arc horn structured to attract the arc; and an arc bypass wire coupled to the base of the arc chute at one end and to a secondary stationary arm of the circuit breaker at another end, where the arc bypass assembly is structured to redirect a portion of current generated during the high current event to the load.

A high voltage circuit-breaker comprising a housing defining a volume for an insulating gas, at least two making and breaking (M&B) units arranged therein, each M&B unit comprising a first and second contact element for forming an electrically conductive connection, at least the first contact element is movable along an axially extending switching axis of the high voltage circuit-breaker, and the first contact elements of the at least two M&B units are motion-coupled; a drive device connected to the first contact element of at least one M&B unit and configured for moving the first contact element along the switching axis over a moving distance for separating conductive connections; and a gas damper connected to the first contact element of the at least one M&B unit and configured for damping movement of the first contact element with a damping force increasing in relation to the moving distance.

A switching device has a commutation flow path, a first isolating gap, and a second isolating gap. The first isolating gap and the second isolating gap form an electrical series circuit which is arranged parallel to the commutation flow path. The second isolating gap has a first contact, a second contact, and a third contact. The first contact is a moving contact. The first contact is mounted movably along a switching axis from a first galvanic contacting position with the second contact to a second galvanic contacting position with the third contact. In the second contacting position, a mechanical contact force acts between the first contact and the third contact in a radial direction.