A point-on-wave relay device includes a first contact relay and a second contact relay in series with the first contact relay. A first state of the first contact relay in conjunction with a first state of the second contact relay causes a point-on-wave open operation and second state of the first contact relay in conjunction with a second state of the second contact relay causes a point-on-wave close operation.

A device for switching an electric current, including a switching block including a mobile electrical contact and a linking unit, integral, as well as an actuation block including an actuator and a mobile pallet. The device includes an improved connection interface, including a pivoting shaft, including an eccentric fastener element, delimiting an internal housing able to accommodate a head of the linking unit. The connection interface can be switched, by rotating the shaft, between a locked state wherein the head of the linking unit is held in the internal housing of the eccentric fastener unit so as to hold the mobile pallet integral in translation with the linking unit, and an unlocked state, wherein the head of the linking unit can move freely in translation with respect to the eccentric fastener element so as to uncouple the mobile pallet from the linking unit.

A contactor with a rotary actuation system, the contactor including a plurality of switching devices configured to switch a plurality of electrical circuits, a plurality of cam followers each operably coupled to one of the switching devices, wherein each cam follower is configured to actuate a switching device, and a cam mechanism, the cam pivotally attached to a point rotation, the cam having plurality of lobes about its perimeter, the cam in operable communication with each cam follower such that upon rotation of the cam mechanism, each cam follower engages a lobe of the plurality of lobes, it causes each cam follower to actuate the respective switching device. The contactor also includes an actuator connected to the cam, the actuator responsive to a control current and operable to rotate the cam and a controller, the controller operable to supply a control current the actuator.

One embodiment describes a method that includes determining, using a control circuitry, temperature of a switching device before a make operation by applying a measurement current to an operating coil of the switching device, wherein the measurement current is insufficient to make the switching device; and determining voltage at the operating coil when the measurement current is applied, in which the voltage at the operating coil is directly related to the temperature. The method further includes determining, using the control circuitry, when to apply a pull-in current to the operating coil to close the switching device based at least in part on the voltage at the operating coil, such that the switching device makes at a desired time.

A power switch module including a switch element, an electromagnetic relay (EMR) and a switching circuit is provided. A first terminal of the switch element is grounded. A control terminal of the switch element receives a driving signal. First control terminals of the switching circuit and the EMR are coupled to a DC power. Second control terminals of the switching circuit and the EMR are coupled to a second terminal of the switch element. Power input terminals of the switching circuit and the EMR are coupled to each other and coupled to an input terminal of the power switch module. Power output terminals of the switching circuit and the EMR are coupled to each other and coupled to an output terminal of the power switch module. The switching circuit is configured to prevent an arc phenomenon caused on the EMR when the EMR is turned on or turned off.

A contactor with a rotary actuation system, the contactor including a plurality of switching devices configured to switch a plurality of electrical circuits, a plurality of cam followers each operably coupled to one of the switching devices, wherein each cam follower is configured to actuate a switching device, and a cam mechanism, the cam pivotally attached to a point rotation, the cam having plurality of lobes about its perimeter, the cam in operable communication with each cam follower such that upon rotation of the cam mechanism, each cam follower engages a lobe of the plurality of lobes, it causes each cam follower to actuate the respective switching device. The contactor also includes an actuator connected to the cam, the actuator responsive to a control current and operable to rotate the cam and a controller, the controller operable to supply a control current the actuator.

A contactor with a rotary actuation system, the contactor including a plurality of switching devices configured to switch a plurality of electrical circuits, a plurality of cam followers each operably coupled to one of the switching devices, wherein each cam follower is configured to actuate a switching device, and a cam mechanism, the cam pivotally attached to a point rotation, the cam having plurality of lobes about its perimeter, the cam in operable communication with each cam follower such that upon rotation of the cam mechanism, each cam follower engages a lobe of the plurality of lobes, it causes each cam follower to actuate the respective switching device. The contactor also includes an actuator connected to the cam, the actuator responsive to a control current and operable to rotate the cam and a controller, the controller operable to supply a control current the actuator.

A system includes a first group of cassettes, each cassette including a first stationary bar, a first plurality of fixed contact members, and a first plurality of movable contact members, each of which is electrically coupled and rotatably connected to the first stationary bar and configured to contact one of the first plurality of fixed contact members. The system includes a second group of cassettes each including a second stationary bar, a second plurality of fixed contact members, and a second plurality of movable contact members, each of which is electrically coupled and rotatably connected to the second stationary bar and configured to contact one of the second plurality of fixed contact members. The system includes at least one operating mechanism to control opening and closing of the movable contact members. The first stationary bar is coupled to the second stationary bar.

A device for switching an electric current, including a switching block including a mobile electrical contact and a linking unit, integral, as well as an actuation block including an actuator and a mobile pallet. The device includes an improved connection interface, including a pivoting shaft, including an eccentric fastener element, delimiting an internal housing able to accommodate a head of the linking unit. The connection interface can be switched, by rotating the shaft, between a locked state wherein the head of the linking unit is held in the internal housing of the eccentric fastener unit so as to hold the mobile pallet integral in translation with the linking unit, and an unlocked state, wherein the head of the linking unit can move freely in translation with respect to the eccentric fastener element so as to uncouple the mobile pallet from the linking unit.

One embodiment describes a tangible, non-transitory, computer-readable medium storing instructions executable by a processor in a control circuitry. The instructions include instructions to receive an instruction to make a switching device; determine, using the control circuitry, a voltage waveform of a power source; determine, using the control circuitry, a desired time to make the switching device based at least in part on the source voltage waveform; determine, using the control circuitry, an expected make time of the switching device; and determine, using the control circuitry, when to apply a pull-in current to make the switching device at the desired time based at least in part on the expected make time and the desired time to make.