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Discussion Starter · #1 ·
Hey guys, first post in this forum. I don't normally post in forums, but I really don't know where else to get help for my electrical build. I am designing and building my own water circuit breaker that is tripped when a leak is detected. When a water sensor is tripped, it cuts off the electricity to any equipment plugged in. I will try and post a paint picture for anyone who wants to see the design. Here is my problem. I need a 120v 10-15 Amp relay with a 12V coil. The trigger is a constant supply of 12VDC going into the coil, until water is detected, then the 12v is shut off. Which then should cut off the 120VAC supply. So essentially what I need as a 120v 10-15Amp SPDT/SPST relay with a 12V coil that is normally open. I have looked on electronic sites and I can't figure out the part naming scheme. If anyone on here has any experience with relays, I could really use the help. Thanks!
 

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I know Radio Shack used to stock a lot of 12v DC relays so you might check there. If you haven't already, check out www.digikey.com as well.. I'm pretty sure you can find one there.

If worse came to worse, I'm sure you can find an auto relay to work for you. The coil is 12v and if you aren't running a ton of current, you might find it more than adequate. Just make sure if you HAD to do that, you look up the contact ratings on it. As long as you aren't running a bunch of inductive loads on it, I would suspect you can find one that will work for your application.
 

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Discussion Starter · #3 ·
Well, this will have my filter and a few pumps running off of it. it will have about 10-15amps of 120v A/C power running through the high side of the relay, and 12vDC running across the coil. I know what kind of relay I need, but when i go to a website like digikey, I can't figure out which part is the correct one. I could reallly use links if anyone can find the right one. I don't mind paying a decent amount for the relay because it will need to handle a fair amount of current.

Thanks,

Matt
 
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