A switch or multiple switches that is operated by an electromagnet. A relay lets you use one circuit to control another, often so a low voltage or low current signal can switch a higher voltage or power.

A high-power relay used for switching line power is often called a contactor.

Some relay modules [often just called relays] include decoders to allow control via DMX or some other serial protocol.

A solid-state relay replaces the mechanical switch and electromagnet with an optocoupler and a triac.

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