An embodiment circuit comprises high-side and low-side switches arranged between supply and reference nodes, and having an intermediate node. A switching control signal is applied with opposite polarities to the high-side and low-side switches. An inductive load is coupled between the intermediate node and one of the supply and reference nodes. Current sensing circuitry is configured to sample a first value of the load current flowing in one of the high-side and low-side switches before a commutation of the switching control signal, sample a second value of the load current flowing in the other of the high-side and low-side switches after the commutation of the switching control signal, sample a third value of the load current flowing in the other of the high-side and low-side switches after the second sampling, and generate a failure signal as a function of the first, second and third sampled values of the load current.

A wireless control switch is provided, which includes: a controller having a wireless communication function, at least one switch module arranged between two connection terminals, and an independent power supply for supplying power to the controller. Each switch module includes a relay and a two-way mechanical switch, a control terminal of the relay is connected to a control pin of the controller. The two-way mechanical switch includes a first group of changeover switches and a second group of changeover switches, an open or closed state of the first group of changeover switches being synchronized with that of the second group of changeover switches. The controller is configured to output a relay holding signal to the relay according to the open or closed state of the first group of changeover switches and a received wireless control signal, to control connection/disconnection between the two connection terminals.

Disclosed is a method for closing the contacts of an electrical switching device during a switch-on process, wherein for a fixed first time period, the first time period and the first voltage being selected in such a way that the armature is not set into motion during the first time period, or the first voltage is applied to the coil until a certain current value is reached, the first time period being the time period until said certain current value is reached, and the first voltage being selected in such a way that the armature is not set into motion during the first time period, wherein a suitable second voltage is defined, the second voltage being greater than the first voltage and being applied to the coil during a second time period in order to move the armature from the open position into the closed position.

Disclosed is a method for closing the contacts of an electrical switching device during a switch-on process, wherein for a fixed first time period, the first time period and the first voltage being selected in such a way that the armature is not set into motion during the first time period, or the first voltage is applied to the coil until a certain current value is reached, the first time period being the time period until said certain current value is reached, and the first voltage being selected in such a way that the armature is not set into motion during the first time period, wherein a suitable second voltage is defined, the second voltage being greater than the first voltage and being applied to the coil during a second time period in order to move the armature from the open position into the closed position.

A signal conditioning circuit for monitoring at least one parameter of an electrical signal in an electrical conductor. The signal conditioning circuit can include an integrator circuit having an input for receiving a signal from a current sensor coupled to the electrical conductor. A first analog switch has an input coupled to the output of the integrator circuit, wherein the first analog switch is controlled by the output of a time delay circuit. A power stage circuit has an input coupled to the output of the first analog switch. The signal conditioning circuit can be used for line fault detection.

A signal conditioning circuit for monitoring at least one parameter of an electrical signal in an electrical conductor. The signal conditioning circuit can include an integrator circuit having an input for receiving a signal from a current sensor coupled to the electrical conductor. A first analog switch has an input coupled to the output of the integrator circuit, wherein the first analog switch is controlled by the output of a time delay circuit. A power stage circuit has an input coupled to the output of the first analog switch. The signal conditioning circuit can be used for line fault detection.

An ERMS system and a method for implementing an ERMS system are disclosed. The ERMS system includes: a self-powered relay comprising a control circuit that controls the self-powered relay to work under one of a first mode and a second mode; a portable power box; and an electrical interface connecting the portable power box to the self-powered relay. Under the second mode, the self-powered relay is configured to reduce energy level in an arc flash event. Upon receiving a signal from the portable power box via the electrical interface, the control circuit controls the self-powered relay to work under the second mode.

An electromagnetic device includes a spool including a cylindrical body portion in which a through hole extending to a first direction is provided, a coil wound around the body portion, an iron core disposed in a through hole of the body portion, a yoke including a first member and a second member, the first member being connected to the iron core and the second member extending from the first member along an outer peripheral surface of the coil, and a movable iron piece, which has a plate shape, including a bent portion in a middle thereof. The yoke includes at least one positioning projection provided in a middle of the free end in the second direction. The movable iron piece includes a positioning recessed portion that accommodates and positions the positioning projection, the positioning recessed portion being provided in a middle between the pair of rotation supporting points.

An electromagnetic device includes a spool including a cylindrical body portion in which a through hole extending to a first direction is provided, a coil wound around the body portion, an iron core disposed in a through hole of the body portion, a yoke including a first member and a second member, the first member being connected to the iron core and the second member extending from the first member along an outer peripheral surface of the coil, and a movable iron piece, which has a plate shape, including a bent portion in a middle thereof. The yoke includes at least one positioning projection provided in a middle of the free end in the second direction. The movable iron piece includes a positioning recessed portion that accommodates and positions the positioning projection, the positioning recessed portion being provided in a middle between the pair of rotation supporting points.

An electrical relay (2) includes an electromagnetic drive system for providing bi-directional drive. The electrical relay (2) includes a first a coil (212) and a second coil (213). A current is supplied to the coils (212) and (213) in opposite directions. The two coils (212) and (213) can be used to accelerate the armature in either direction in relation to the two contacts. This can be used to drive the armature to either one of the contacts and to accelerate and decelerate the armature during a single transit. In the latter regard, the armature can be accelerated and decelerated to shorten the transit time, reduce bounce, reduce wear on the contacts, and allow for different contact material options.