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Need Help Choosing Relay for 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=12156
Printed Date: August 25, 2025 at 4:40 AM


Topic: Need Help Choosing Relay for Momentary

Posted By: tok3n
Subject: Need Help Choosing Relay for Momentary
Date Posted: April 13, 2003 at 5:45 PM

        Hi.  I'm not very knowledgable with electrical circuits and devices so I need some help.

I have a Vandal Resistant LED momentary switch (https://www.bulgin.co.uk/Products/Switches/Illuminated.html) that I want to use to turn on and off some cold cathode lights in my computer.

The switch has 4 prongs - 2 for the device being operated and 2 to power the LED on the switch itself.

I would like to use a relay which would allow me to turn on the cathode lights and the LED on the switch when the button is pressed - and turn both off when the SAME button is pressed again.

I assume I would need a single coil DPDT? (https://www.medibix.com/runsearch.jsp?category_id=14124&productsort=manufacturer&view=sku&product_id=455747)

Single coil allowing me press the button, activate the relay and turn on the lights - press button 2nd time to activate relay and turn off the lights?

and DPDT allowing me to connect both the actual light to be controlled and also a separate circuit for the LED on the button itself?

The power sources will be 12V for the cathode light and 5V for the LED



Replies:

Posted By: tok3n
Date Posted: April 13, 2003 at 9:48 PM
Maybe a switch that will allow Latched On/Off Output Using a Single Momentary Pulse like here (https://www.the12volt.com/relays/page5.asp#lsp) but w/o wiring 4-5 simple relays together.





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