A power distribution box (PDB) includes relays to connect a vehicle battery to corresponding electronic control units (ECUs) of a vehicle. A processor is programmed to instruct the PDB via a control interface to cause one of the relays to power a target ECU, send a sleep command over a vehicle bus to cause powered ECUs other than the target ECU to sleep, and install a software update to the target ECU.

Systems and methods for testing a protection relay, such as a primary bus protection relay, may include a testing device for providing current signals imitating current on both sides of a bus to the primary bus protection relay. The signals may be provided using signals corresponding with a signal format from merging units or other monitoring devices. The testing device may be configured to receive communications from the primary bus protection relay for evaluation of the operation of the primary bus protection relay.

[Problem] To provide a fail-safe function for an operation of grounding a circuit to be grounded and for an operation of ungrounding a circuit to be grounded.

[Solution] The present invention is provided with: a first contact in a first relay connected to a grounded circuit; a resistor which is connected between the first contact and the earth, and which inhibits the flow of electric current to the first contact when the first contact is closed; a second contact in a second relay connected in parallel to the resistor; and an interlocking control means which inhibits opening of the first contact in a closed state when the second contact is opened, and which inhibits closing of the first contact in an open state when the second contact is closed.

A no-voltage output and voltage output switching circuit includes an actuator connection terminal block including a plurality of ports each including a first pin, a second pin, and a third pin to which an actuator is connected, a power connection terminal block including a voltage terminal and a common terminal to which a power supply is connected, first relays, and second relays. The common terminal is connected to the second pin of each of the plurality of ports. The first relay enables connection between the first pin of a corresponding port among the plurality of ports and the third pin of the corresponding port. The second relay corresponding to the port corresponding to the first relay enables connection between the first pin of the port and the voltage terminal.

A lighting device includes a light source, an auxiliary device, and a control device configured to detect toggles of a switch that controls availability of an input power to the lighting device including the light source. The control device is configured to change an operation mode of the auxiliary device based on the toggles of the switch.

A microelectromechanical systems (MEMS) switch die having an N number of radio frequency (RF) MEMS switches, each having a anchored beam with a switch contact, a gate, and a terminal contact is disclosed. Also included is a MEMS-based decoder having logic gates comprised of logic MEMS switches that are configured to decode the coded signals to determine which of the N number of RF MEMS switches to open and close, apply a higher level gate voltage to each gate of the RF MEMS switches determined to be closed, wherein the higher gate voltage electrostatically pulls the anchored beam and brings the switch contact into electrical contact with the terminal contact, and apply a lower gate voltage to each gate of the RF MEMS switches to be opened, wherein the lower gate voltage releases the anchored beam and allows the switch contact to break electrical contact with the terminal contact.

A mutually exclusive power controller with master lockout. The controller includes a plurality of isolated power circuits electrically connected to an AC power supply. Each of the isolated power circuits has a female receptacle for mating engagement with a corresponding male plug and a relay electrically connected to the receptacle. The relay connects the receptacle to the AC power supply when the relay is energized. A master lockout electrically connected between the AC power supply and the relay of each of the isolated power circuits disconnects the isolated power circuits from the AC power supply when the master lockout is at rest.

A relay device includes a controller, a capacitor included in a charger, and a discharge circuit that discharges electric charge charged to the capacitor. The discharge circuit includes a discharge resistance, a first relay switch connected to the discharge resistance and having a contact point that becomes a closed state by electric conduction to an exciting coil, and a second relay switch connected in parallel to the first relay switch and having a contact point that becomes an open state by electric conduction to an exciting coil. The controller, by mutually switching between a state in which the first relay switch is turned on and the second relay switch is turned off and a state in which the first relay switch is turned off and the second relay switch is turned on, determines abnormality of the first relay switch and the second relay switch.

A coil control device of an electronic magnetic contactor, comprises: an input power processing unit configured to convert and output an input power into a direct current power; an input voltage detecting unit configured to detect a voltage level of the direct current power outputted from the input power processing unit; a control unit configured to output a control signal for controlling current flowing in a coil using the voltage level detected by the input voltage detecting unit; and a switching unit configured to connect or cutoff the current flowing in the coil by switching according to the control signal from the control unit, wherein the control unit includes a gate driver electrically connected with the switching unit and configured to block noise from the coil.

Provided are: a submarine cable system with which it is possible, with a simple configuration, to acquire the state of each of a plurality of high-voltage relays in a branching device; the branching device; and a state response method therefor. The branching device comprises: a plurality of interlocking relays respectively corresponding to a plurality of high-voltage relays for switching feeding paths; a drive unit which supplies drive electric currents supplied to the plurality of high-voltage relays to the plurality of corresponding interlocking relays, respectively; a state detection unit which detects operation states of the plurality of interlocking relays as the operation states of the plurality of high-voltage relays; and a response unit which, on the basis of the result of detection of the operation states of the plurality of interlocking relays, transmits the operation states of the plurality of high-voltage relays.