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--- electrical:relay [2018/01/11 14:55]
frater_secessus [Relays]
+++ electrical:relay [2020/10/11 19:48]
@@ Line 1: / Line 1: @@
-====== Relays ======
-Electrical relays are devices used to **turn relatively heavy loads on/off**.  They are //triggered by small amounts of power// from an external source (usually a switch operated by the user) but //can pass larger amounts of power// to the load.  This reduces the cost and physical requirements of the switch and can help automate some processes.
-A typical setup looks like this:  switch (and house power) --> relay --> load
-The most common relay campers are exposed to is the solenoid for [[electrical:12v:alternator|charging house batteries from the coach's alternator]].  When the vehicle is turned on power activates the solenoid and connects the house and vehicle electrical systems.
-Relays are also useful for powering loads from [[electrical:12v:lvd|LVD]] or [[electrical:solar:charge_controller|Charge Controller]] LOAD outputs.  This allows powering larger loads than the controller is rated for.
-Common uses:
-  * battery isolation when [[electrical:12v:alternator|alternator charging]]
-  * [[electrical:12v:lvd|low voltage disconnect (LVD)]]
-===== normally open vs normally closed =====
-Relays come in two basic types:
-  - **Normally Open (NO)** - the output circuit is open/incomplete when the relay is resting.  No power flows.  The controlled device is **off** until the relay is triggered.  //This is usually the default.//
-  - **Normally Closed (NC)** - the output circuit is closed/complete when the relay is resting.  Power flows.  The controlled device is **on** until the relay is triggered.
-===== 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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