Relay facts for kids
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.
Images for kids
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A relay
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An automotive-style miniature relay with the dust cover taken off
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Telegraph relay contacts and spring
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Simple electromechanical relay
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Operation without flyback diode, arcing causes degradation of the switch contacts
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Operation with flyback diode, arcing in the control circuit is avoided
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A small cradle relay often used in electronics. The "cradle" term refers to the shape of the relay's armature
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Latching relay with permanent magnet
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A mercury-wetted reed relay
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(from top) Single-pole reed switch, four-pole reed switch and single-pole reed relay. Scale in centimeters
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Solid-state relays have no moving parts.
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25 A and 40 A solid state contactors
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A DPDT AC coil relay with "ice cube" packaging
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Part of a relay interlocking using UK Q-style miniature plug-in relays
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Several 30-contact relays in "Connector" circuits in mid-20th century 1XB switch and 5XB switch telephone exchanges; cover removed on one.
See also
In Spanish: Relé para niños
