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  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A relay Electromechanical relay principle Electromechanical relay schematic showing a control coil, four pairs of normally open and one pair of normally closed contacts An automotive-style miniature relay with the dust cover taken off. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple ...

  3. Protective relay - Wikipedia

    en.wikipedia.org/wiki/Protective_relay

    An instantaneous over-current relay is an overcurrent relay which has no intentional time delay for operation. The contacts of the relay are closed instantly when the current inside the relay rises beyond the operational value. The time interval between the instant pick-up value and the closing contacts of the relay is very low.

  4. Electrical contact - Wikipedia

    en.wikipedia.org/wiki/Electrical_contact

    When relay contacts open to interrupt a high current with an inductive load, a voltage spike will result, striking an arc across the contacts. If the voltage is high enough, an arc may be struck even without an inductive load. Regardless of how the arc forms, it will persist until the current through the arc falls to the point too low to ...

  5. High-voltage interface relay - Wikipedia

    en.wikipedia.org/wiki/High-voltage_interface_relay

    High voltage interface relays, a.k.a., interface relays: [1] [2] or coupling relays or insulating interfaces [3] [4] is a special class of electrical relays designed to provide informational and electrical compatibility between functional components isolated from each other and not allowing for a direct connection due to a high difference of potentials.

  6. Solid-state relay - Wikipedia

    en.wikipedia.org/wiki/Solid-state_relay

    Solid state relay with green LED Solid state contactor PCB mount solid-state DIL relay. A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals.

  7. Reed relay - Wikipedia

    en.wikipedia.org/wiki/Reed_relay

    A reed relay [i] is a type of relay that uses an electromagnet to control one or more reed switches. ... Their current handling capacity is limited but, with ...

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