The present disclosure relates to a relay module including a control input for combined control and power supply of the relay module with alternating voltage. A fixed voltage controller of the relay module generates a fixed voltage after rectification of the alternating voltage or a portion of the alternating voltage. A comparator is operated by the fixed voltage and derives a reference voltage from the fixed voltage. The comparator compares a rectified and smoothed portion of the alternating voltage with the reference voltage. A switching step of the relay module operates a relay unit according to the comparison of the comparator, which relay unit is connected on the input side to the switching step and on the output side to switch connections of the relay module.

A two-wire smart load control device, such as an electronic switch, for controlling the power delivered from a power source to an electrical load comprises a relay for conducting a load current through the load and an in-line power supply coupled in series with the relay for generating a supply voltage across a capacitor when the relay is conductive. The power supply controls when the capacitor charges asynchronously with respect to the frequency of the source. The capacitor conducts the load current for at least a portion of a line cycle of the source when the relay is conductive. The load control device also comprises a bidirectional semiconductor switch, which is controlled to minimize the inrush current conducted through the relay. The bidirectional semiconductor switch is rendered conductive in response to an over-current condition in the capacitor of the power supply, and the relay is rendered non-conductive in response to an over-temperature condition in the power supply.

A two-wire smart load control device, such as an electronic switch, for controlling the power delivered from a power source to an electrical load comprises a relay for conducting a load current through the load and an in-line power supply coupled in series with the relay for generating a supply voltage across a capacitor when the relay is conductive. The power supply controls when the capacitor charges asynchronously with respect to the frequency of the source. The capacitor conducts the load current for at least a portion of a line cycle of the source when the relay is conductive. The load control device also comprises a bidirectional semiconductor switch, which is controlled to minimize the inrush current conducted through the relay. The bidirectional semiconductor switch is rendered conductive in response to an over-current condition in the capacitor of the power supply, and the relay is rendered non-conductive in response to an over-temperature condition in the power supply.

Systems and methods for contact erosion mitigation are provided. To perform contact erosion mitigation, an order of opening/closing poles and/or contact relays of particular poles is altered, resulting in a sharing of potential arcing conditions amongst the poles/contact relays of these poles.

Systems and methods for contact erosion mitigation are provided. To perform contact erosion mitigation, an order of opening/closing poles and/or contact relays of particular poles is altered, resulting in a sharing of potential arcing conditions amongst the poles/contact relays of these poles.

Provided herein are methods for an improved bi-stable relay. In some embodiments, a method may include providing a core assembly within a housing, the core assembly comprising a plunger extending through a coil support structure. The method may further include winding a first coil and a second coil about a central section of the coil support structure, providing a first magnet and a first ferromagnetic plate at a first end of the coil support structure, and providing a second magnet and a second ferromagnetic plate at a second end of the coil support structure. In some embodiments, the method may further include activating the first coil or the second coil to move the plunger between a first position and a second position, wherein in the first position a circuit formed by a set of contacts is closed, and wherein in the second position the circuit is open.

A circuit arrangement for switching an electrical load comprising an electrical switching element with a control input and an output; a control unit connected to the control input to drive the electrical switching element, in a first switching state, to generate a first output signal forming a switch-on signal for the load and, in a second switching state, to generate a second output signal, smaller than the first output signal, forming a switch-off signal for the electrical load; a safety output connected electrically to the electrical switching element output and to which the electrical load is connected; a decoupling apparatus arranged between the electrical switching element output and the safety output; a first output signal detecting apparatus connected to the electrical switching element output; and a second output signal detecting apparatus arranged in a circuit path between the decoupling apparatus and the safety output.

In one aspect, a modular static transfer switch is provided. The module static transfer switch includes an output configured to couple to a load, a first input configured to couple to a first power source, and a second input configured to couple to a second power source. The modular static transfer switch further includes a plurality of sold-state switch modules each comprising at least one solid-state switch. A first plurality of the solid-state switch modules are coupled in parallel between the first input and the output, each configured to selectively couple the first power source to the output using the at least one solid-state switch. A second plurality of the solid-state switch modules are coupled in parallel between the second input and the output, each configured to selectively couple the second power source to the output using the at least one solid-state switch.

In one aspect, a modular static transfer switch is provided. The module static transfer switch includes an output configured to couple to a load, a first input configured to couple to a first power source, and a second input configured to couple to a second power source. The modular static transfer switch further includes a plurality of sold-state switch modules each comprising at least one solid-state switch. A first plurality of the solid-state switch modules are coupled in parallel between the first input and the output, each configured to selectively couple the first power source to the output using the at least one solid-state switch. A second plurality of the solid-state switch modules are coupled in parallel between the second input and the output, each configured to selectively couple the second power source to the output using the at least one solid-state switch.

An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.