A DC circuit breaker capable of blocking a fault current flowing through a DC line when a fault occurs in the DC line is proposed. The DC circuit breaker includes a main switch connected to a first DC line at one end and connected to a second line at the other end; a first circuit unit connected in parallel to the main switch; and n second circuit units each connected in parallel to the main switch, wherein the first circuit unit is composed of a series connection of an inductor, a first capacitor and a first switch, the inductor or the first capacitor being connected to the first DC line and the first switch being connected to the second DC line.

Described are devices for automatically adapting electrical polarity from a power source to a specified output polarity for use by an electrical load. In one implementation, power adaptation circuitry comprising one or more bridge circuits accept electrical power of unspecified polarity and output specified polarity. The bridge circuit may comprise a plurality of field-effect transistors (FETs) configured such that a particular subset of the FETs are energized to conduct electric current to the outputs when a particular polarity is applied at inputs.

A configuration for generating a zero current pulse for generating a zero current crossing in an electrical component through which a direct current flows, in particular a vacuum interrupter, includes a switch and an electrical energy storage device or store having two poles through which the electrical energy storage device can be charged by a voltage source. A loop can be formed by the energy storage device, the electrical component through which the direct current flows and the switch, so that the energy storage device can be discharged by closing the switch while generating a zero current pulse counter to the direct current across the electrical component. The energy storage device has a plurality of energy storage elements for mutual generation of a zero current pulse.

A contactor apparatus and method for operating the contactor apparatus can include a contactor assembly with a contactor coil operably coupled to a contactor switch. One or more sensors can be provided in the contactor assembly adapted to measure one or more aspects of the contactor assembly. Based upon the measured aspects, a controller can initiate operation of the contactor switch to effectively toggle the contactor switch at a zero-crossing point along an alternating current waveform.

A switching device for a high-voltage circuit breaker includes at least two switches for ascertaining states of apparatuses of the switching device via a monitoring system. The at least two switches are connected together in series and/or in parallel and can be connected together to exactly one input of the monitoring system. A high-voltage circuit breaker includes the switching device and the monitoring system, which is and/or includes a data acquisition, data processing, data storage and/or data transmission unit, in particular with digital-analog and/or analog-digital converters. A method for operating the switching device provides the at least two switches connected in series and/or in parallel, and forwards the state of the apparatuses via an input, in particular via exactly one input of the monitoring system, in the form of electric variables, in particular a voltage.

A switching device for a high-voltage circuit breaker includes at least two switches for ascertaining states of apparatuses of the switching device via a monitoring system. The at least two switches are connected together in series and/or in parallel and can be connected together to exactly one input of the monitoring system. A high-voltage circuit breaker includes the switching device and the monitoring system, which is and/or includes a data acquisition, data processing, data storage and/or data transmission unit, in particular with digital-analog and/or analog-digital converters. A method for operating the switching device provides the at least two switches connected in series and/or in parallel, and forwards the state of the apparatuses via an input, in particular via exactly one input of the monitoring system, in the form of electric variables, in particular a voltage.

An arrangement includes a gas insulated switchgear and a RC voltage divider. The gas insulated switchgear includes a switchgear compartment and a voltage divider compartment. The RC voltage divider and the gas insulated switchgear together at least partially form a hermetically sealed common gas compartment. A method for assembling the arrangement is also provided.

An arrangement includes a gas insulated switchgear and a RC voltage divider. The gas insulated switchgear includes a switchgear compartment and a voltage divider compartment. The RC voltage divider and the gas insulated switchgear together at least partially form a hermetically sealed common gas compartment. A method for assembling the arrangement is also provided.

A breaking device includes an interrupting section including interrupting units in which main interrupters, impedance circuits, and unit arresters are connected in parallel to each other, the main interrupters being connected in series, a resonant circuit section including a reactor, a capacitor, and a closing switch and connected in parallel to the interrupting section, and an all-point arrester connected in parallel to the interrupting section via the reactor. The clamping voltages of the unit arresters are equal among the interrupting units, and are in the range of 1.1 to 1.6 times the value obtained by dividing the clamping voltage of the all-point arrester by the number of the interrupting units connected in series in the interrupting section.

The present disclosure relates to direct current arc extinguishing circuit and apparatus. The direct current arc extinguishing circuit and apparatus are suitable for quickly extinguishing arc of mechanical contacts such as mechanical switches, where a mechanical switch requiring arc extinguishing is connected with a load in series. It includes a voltage detection switch and a capacitor, wherein the voltage detection switch is connected with the capacitor. During the breaking of the mechanical switch, the capacitor forms a discharge loop by the voltage detection switch and the load, and is used for breaking arc extinguishing of the mechanical switch. The present disclosure is reasonable in design and has the advantages of low cost and high arc extinguishing speed.