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Wiring relay to break momentary

Printed From: the12volt.com
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=10250
Printed Date: July 18, 2025 at 3:57 PM


Topic: Wiring relay to break momentary

Posted By: cajun_bred
Subject: Wiring relay to break momentary
Date Posted: March 01, 2003 at 9:51 AM

I am needing to wire a relay to break a constant ground just momentarily. I will be sending the relay a momentary negative pulse or it can be converted to a positive pulse. The ground break needs to be done in order for my mementary to constant relay out to be broken.
Thanks



Replies:

Posted By: the12volt
Date Posted: March 01, 2003 at 10:33 AM

If your "momentary to constant" output is a positive output, connect it to terminal 86 of an additional relay. Connect 85 to the ground you wish to use to interrupt your "momentary to constant" output. Connect the ground needed to maintain your "momentary to constant" output to terminal 87a of the additional relay and connect terminal 30 of the additional relay to ground.

If the output from your "momentary to constant" is a negative output, connect it to terminal 85 of an additional relay. Connect terminal 86 and 87 of this additional relay to a fused constant 12V+, connect terminal 30 to terminal 86 of a second additional relay. Connect terminal 85 of the second additional relay to the ground you wish to use to  interrupt your "momentary to constant" output. Connect the ground needed to maintain your "momentary to constant" output to terminal 87a of the second additional relay and connect terminal 30 of the second additional relay to ground.

When you apply the ground you wish to use to interrupt the "momentary to constant" output, it will break the ground needed to maintain it and shut it off.



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