Relay
A relay is an electromagnetically operated switch. It was invented in the 19th century to make electric telegraph signals go farther. Nowadays relays control circuits with low-voltages. Many machines use them, including vehicles and electronics.
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Relay Media
Electromechanical relay principle
Circuit symbols of relays (C denotes the common terminal in SPDT and DPDT types.)
Latching relay with permanent magnet
A mercury-wetted reed relay
Solid-state relays have no moving parts.
25 A and 40 A solid state contactors
Part of a relay interlocking using UK Q-style miniature plug-in relays
