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2. Contactor - Wikipedia

   en.wikipedia.org/wiki/Contactor

   AC contactor for pump application. 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.

3. Mercury relay - Wikipedia

   en.wikipedia.org/wiki/Mercury_relay

   Normally closed mercury relay, with coil around top of tube and adjustable angle. A mercury relay (mercury displacement relay, mercury contactor) is a relay that uses mercury as the switching element. They are used as high-current switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts.

4. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   Since relays are switches, the terminology applied to switches is also applied to relays; a relay switches one or more poles, each of whose contacts can be thrown by energizing the coil. Normally open (NO) contacts connect the circuit when the relay is activated; the circuit is disconnected when the relay is inactive.

5. 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.

6. Contact protection - Wikipedia

   en.wikipedia.org/wiki/Contact_protection

   Typical contact elements of an electromechanical relay or contactor. 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.

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.