The present disclosure provides an arc-free DC circuit breaker that combines magnetic induction transfer and resistive current limiting. The circuit breaker comprises a main current circuit and a transfer current circuit. The transfer current circuit has a bridge structure; with a group of unidirectional components having a breaking function, bidirectional current breaking is implemented, such that compared with the prior art, usage of the turn-off devices may be reduced to half. By controlling action sequences of the trigger gap, high-speed switch, and power semiconductor, fast switching arc-free opening of the main current circuit is implemented; meanwhile, the breaking capability of the circuit breaker is significantly improved. By virtue of the current limiting module circuit inside the transfer current circuit, the present disclosure quickly limits short-circuit fault current, and then reduces the number of parallel groups of full-controlled devices of the breaking module circuit. Compared with the existing circuit breaker structures, usage of turn-off devices and cost of the circuit breaker may be significantly reduced.

The present disclosure provides a hybrid circuit breaker having a bridge induction transfer structure, characterized in that the circuit breaker comprises a main current circuit, an over-voltage limiting circuit, and a transfer current circuit; and the main current circuit, the over-voltage limiting circuit, and the transfer current circuit are connected in parallel. The induction transfer circuit in the transfer current circuit comprises an induction transfer inductor, an induction transfer capacitor, and an induction transfer branch power semiconductor device which are connected in series; the transfer current circuit further comprises a bridge circuit comprised of a main loop capacitor; the main loop inductor and the induction transfer inductor are coupled to form a transformer. The present invention can implement fast breaking of the current, and effectively reduce the volume and manufacturing cost of the circuit breaker. With the induction transfer circuit, fast current transfer is implemented. The main loop capacitor needs no pre-charging. Isolation between the secondary charging circuit and the main loop is implemented. The transfer speed is fast, and the breaking reliability is high.

A mechanical breaker apparatus for breaking an electric circuit comprises two electrodes that are movable relative to each other, and including an electric arc splitter device having a multitude of distinct conductive elements that are spaced apart and electrically insulated relative to one another. The splitter device has a first portion and a second portion that are movable relative to each other between: an electrical contact position; and a spaced-apart position of the two portions. The splitter device has at least one series of the distinct conductive elements that, in an electrically closed position of the electrodes of the mechanical apparatus, are arranged along the continuous electrically-conductive path for the nominal electric current through the apparatus as defined by the two portions of the splitter device in the electrical contact position.

A mechanical breaker apparatus for breaking an electric circuit comprises two electrodes that are movable relative to each other, and including an electric arc splitter device having a multitude of distinct conductive elements that are spaced apart and electrically insulated relative to one another. The splitter device has a first portion and a second portion that are movable relative to each other between: an electrical contact position; and a spaced-apart position of the two portions. The splitter device has at least one series of the distinct conductive elements that, in an electrically closed position of the electrodes of the mechanical apparatus, are arranged along the continuous electrically-conductive path for the nominal electric current through the apparatus as defined by the two portions of the splitter device in the electrical contact position.

An ultrafast electromechanical switch having a drive mechanism comprising two non-movable contacts connected to electrical feedthroughs, one actuator and one movable contact. The provided ultrafast electrical (e.g., transfer, disconnect, etc.) switch is simple, compact, clean, exhibits ultralow loss, does not require high energy to operate and is capable of being automatically reset.

An ultrafast electromechanical switch having a drive mechanism comprising three non-movable contacts, an actuator and two movable contacts. The switch further including a switching chamber to provide a self-contained environment that may consist of a high-pressure gas or a vacuum and one or more precision adjustment screws coupled to the non-movable contacts for adjusting the contact pressure. The provided ultrafast electrical (e.g., transfer, disconnect, etc.) switch is simple, compact, clean, exhibits ultralow loss, does not require high energy to operate and is capable of being automatically reset.

An ultrafast electromechanical switch having a drive mechanism comprising three non-movable contacts, an actuator and two movable contacts. The switch further including one or more precision adjustment screws coupled to the non-movable contacts for adjusting the contact pressure. The provided ultrafast electrical (e.g., transfer, disconnect, etc.) switch is simple, compact, clean, exhibits ultralow loss, does not require high energy to operate and is capable of being automatically reset.

An ultrafast electromechanical switch having a drive mechanism comprising three non-movable contacts, an actuator, two movable contacts and a first and second mounting plate forming an elliptical shell configuration about said actuator. The switch further including a switching chamber to provide a self-contained environment that may consist of a high-pressure gas or a vacuum and one or more precision adjustment screws coupled to the non-movable contacts for adjusting the contact pressure. The provided ultrafast electrical (e.g., transfer, disconnect, etc.) switch is simple, compact, clean, exhibits ultralow loss, does not require high energy to operate and is capable of being automatically reset.

A voltage dividing capacitor (1) arranged parallel to a vacuum interrupter (2) has a long narrow cylindrical-shaped capacitor series (16) that is configured by a plurality of capacitor elements (15) being connected with connecting screws. One end of the capacitor series (16) is supported by a fixed supporting unit (25), and the other end id supported by a movable supporting unit (26) so as to allow thermal expansion and contraction. A insulation tube (31) fixed to the movable supporting unit (26) has a short length, and only a first capacitor element (15A) is fitted into the insulation tube (31). Since a portion where high electric field appears is a middle of five capacitor elements (15) and electric field at an end portion of the capacitor series (16) is low, forming of triple junction at the portion of the high electric field is avoided.

A switching system for switching an electrical device that includes a vacuum breaker. The vacuum breaker includes a fixed electrode, and a mobile electrode, able to move between a first position, referred to as a closed position, and a second position, referred to as an open position. The electrical device also includes a driving plate connected to the mobile electrode, and a main switch able to move between a first position allowing electrical current to pass in a main electric circuit of the electrical device and a second position preventing electrical current from passing in the main electric circuit, the main switch being configured to drive the driving plate during the transition from the first position to the second position, so as to cause the mobile electrode to make the transition from the closed position to the open position. The electrical device further includes a contact-maintaining element configured to maintain mechanical and electrical contact between the driving plate and the main switch while the driving plate is being driven by the main switch.