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  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems. A number of relays could be used together to carry out complex functions (relay logic). The principle of relay ...

  3. Protective relay - Wikipedia

    en.wikipedia.org/wiki/Protective_relay

    The relays are in round glass cases. The rectangular devices are test connection blocks, used for testing and isolation of instrument transformer circuits. In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected. [1]: 4 The first protective relays were electromagnetic devices ...

  4. Electromechanics - Wikipedia

    en.wikipedia.org/wiki/Electromechanics

    Electromechanics. A relay is a common electro-mechanical device. Electromechanics[1][2][3][4] combines processes and procedures drawn from electrical engineering and mechanical engineering. Electromechanics focuses on the interaction of electrical and mechanical systems as a whole and how the two systems interact with each other.

  5. Contactor - Wikipedia

    en.wikipedia.org/wiki/Contactor

    A contactor is an electrically controlled switch used for switching an electrical power circuit. [1] A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch. Unlike general-purpose relays, contactors are designed to be ...

  6. Contact protection - Wikipedia

    en.wikipedia.org/wiki/Contact_protection

    A “contact” is a pair of electrodes (typically, one moving; one stationary) designed to control electricity. Electromechanical switches, relays, and contactors “turn power on” when the moving electrode makes contact with the stationary electrode to carry current. Conversely, they “turn power off” when the moving electrode breaks ...

  7. Electrical contact - Wikipedia

    en.wikipedia.org/wiki/Electrical_contact

    An electromagnetic relay with a pair of contacts. An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. [1] Each contact is a piece of electrically conductive material, typically metal. When a pair of contacts touch, they can pass an electrical current with a certain ...