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Relay Education


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rcuestas28 
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Posted: June 11, 2020 at 3:53 PM / IP Logged Link to Post Post Reply Quote rcuestas28
What is the purpose of pin 87A on a relay and when would you use it?
the12volt 
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Posted: June 11, 2020 at 3:59 PM / IP Logged Link to Post Post Reply Quote the12volt
There are many applications that utilize terminal 87a of an SPDT relay. Start here: https://www.the12volt.com/relays/spdt-and-spst-automotive-relays.asp. Then follow the links under "Relays and Relay Wiring Diagrams" near the bottom.
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rcuestas28 
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Posted: June 16, 2020 at 3:23 AM / IP Logged Link to Post Post Reply Quote rcuestas28
Okay. I'm understanding that a 5 pin relay will always have either 87a or 87 energized depending on if the switch is on or off. Whicu makes sense for high/low beams.
In the scenario of connecting a 5 pin like a 4 pin: (A relay with pre-installed wires in it)
30 - car battery with in-line fuse
86 - ground
85 - 12v switch box
87 - accessory light
87a - (not connected and not exposed)
Does that mean that the relay will still draw current when the vehicle and the switch is off?
Or will this function just like a 4 pin since 87A is not connected to anything?
i am an idiot 
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Posted: June 16, 2020 at 4:03 AM / IP Logged Link to Post Post Reply Quote i am an idiot
Zero current draw in this application.

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