which relay to use
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=135262
Printed Date: May 14, 2025 at 5:53 PM
Topic: which relay to use
Posted By: davidp773
Subject: which relay to use
Date Posted: November 11, 2013 at 10:38 AM
i am trying to have a relay control an electrical outlet 120v 15amp
the input of the relay 24v. i would like to know what relay to use and how to wire it up. Thanks
Replies:
Posted By: KPierson
Date Posted: November 11, 2013 at 8:05 PM
There are literally millions of relays available for purchase. If you want us to spec out the best relay for you you need to supply more information.
You say the coil should be 24V - is that AC or DC?
How often is the relay going to switch on and off?
What is going to power the coil of the relay? How much current can it supply?
Do you only need to turn one outlet on and off?
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Kevin Pierson
Posted By: davidp773
Date Posted: November 12, 2013 at 8:32 AM
24v AC the relay is going to switch on and off often and stay for for minutes at a time probably 20 minutes max. only 1 outlet will need to be used.
Thank You
Posted By: KPierson
Date Posted: November 13, 2013 at 6:44 AM
I would go with something like this:
https://www.digikey.com/product-detail/en/HL1-HTM-AC24V-F/255-2794-ND/2125695
Your 24v control will hook up to pins 7 and 8. Your 120vac feed will connect to pin 3 and your outlet will connect to pin 6. Pin 2 will not be used.
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Kevin Pierson
Posted By: davidp773
Date Posted: November 15, 2013 at 10:53 PM
Thank you i will let you know if it works.. I was wondering also is there a relay where the coil can be between two voltages?? Like 6v - 24v
Posted By: KPierson
Date Posted: November 16, 2013 at 8:10 AM
Solid state relays would be the best choice for a wide input range. It would be hard to find an inductive relay that would trigger from 6v-24v. I don't think I've ever seen one. You could possibly do to relays in parallel and have the higher voltage relay open up the leads on the lower voltage relay to prevent burning up the coil. I think at that point though a solid state relay (or even just a transistor drive circuit driving a relay of your choice) would be a better fit.
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Kevin Pierson
Posted By: KPierson
Date Posted: November 16, 2013 at 8:22 AM
Is there a possibility of getting a third switch? If you had a dedicated "off" switch this would be much, much easier.
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Kevin Pierson
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