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--- electrical:12v:relay [2017/10/25 07:25]
frater_secessus created
+++ electrical:12v:relay [2017/10/25 07:44]
frater_secessus
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+> A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal. -- Wikipedia((https://en.wikipedia.org/wiki/Relay))
+Common uses:
+  * battery isolation when [[electrical:12v:alternator|alternator charging]]
+  * [[electrical:12v:lvd|low voltage disconnect (LVD)]]
+===== latching relays =====
+Normally it takes power from the trigger source to operate the relay.  A latching relay, however, moves from position to position and locks there even when power is removed.

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