Relay - Wikipedia
https://en.wikipedia.org:443/wiki/Relay
OverviewHistoryBasic design and operationTerminologyTypesApplicationsSafety and reliabilitySee alsoA relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof. Relays are used where it is necessary to control a circuit by an independent low …
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