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2. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   Operators can be isolated from the high voltage circuit. Low power devices such as microprocessors can drive relays to control electrical loads beyond their direct drive capability. In an automobile, a starter relay allows the high current of the cranking motor to be controlled with small wiring and contacts in the ignition key.

3. H-bridge - Wikipedia

   en.wikipedia.org/wiki/H-bridge

   A "double pole double throw" (DPDT) relay can generally achieve the same electrical functionality as an H-bridge (considering the usual function of the device). However a semiconductor-based H-bridge would be preferable to the relay where a smaller physical size, high speed switching, or low driving voltage (or low driving power) is needed, or ...

4. 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.

5. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   A high-voltage disconnect switch used in an electrical substation. Such switches are used mostly to isolate circuits, and usually cannot break load current. High-voltage switches are available for the highest transmission voltages, up to 1 million volts. This switch is gang-operated so that all three phases are interrupted at the same time.

6. 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.

7. Automatic test switching - Wikipedia

   en.wikipedia.org/wiki/Automatic_test_switching

   The simplest definition of a switch is “a device that opens or closes a circuit.” [1] A relay is an electronically operated switch. Three relay types are commonly used in automated test system switching: Electromechanical relays are the most-often-used type because they have the largest signal range capability of the three.