Differences

This shows you the differences between two versions of the page.

--- electrical:relay [2017/07/08 23:35]
frater_secessus
+++ electrical:relay [2020/10/11 19:48]
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-====== 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.
-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.
-===== 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**.  //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**.

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