if 87a not used, SPST ok?

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=37709
Printed Date: May 14, 2025 at 7:43 AM

Topic: if 87a not used, SPST ok?

Posted By: blingo
Subject: if 87a not used, SPST ok?
Date Posted: August 18, 2004 at 11:35 PM

when places show how to wire up a relay to do a certain thing, and they say 87A - not in use, does this mean i can get away with using a spst? or do i still have to use a spdt, just not use the 87A pin? thanks

Replies:

Posted By: HotRod53F100
Date Posted: August 24, 2004 at 6:34 PM

If you are only using 2 coil wires and 2 other wires being controlled, there is no reason to use a SPDT, a SPST will work just fine. Just be sure that you have the amperage rating and wire away!

Posted By: hotwaterwizard
Date Posted: September 04, 2004 at 2:23 PM

I think there is a little confusion going on here. 87a is used on a SPDT Relay ASPST Relay only has 1 Pole or Switch. posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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