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simple relay 120v

ep4433

Mar 2, 2012
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Mar 2, 2012
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what is a good simple 120v relay that is on with current but off without and needs manual
reset. Is there a plug model around that I can just plug in both ends?? ...it is for when power goes out... I want it to disconnect and not reconnect unless manual reconnect.
I guess some surge supp. have relays similar in them but they are notoriously un reliable.
I need to protect some radio stuff...
i need to know where I can get one and cheap..
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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What is it that you're actually trying to do?
 

Harald Kapp

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You can use any DPST relay with suitable contact rating in this circuit:
attachment.php


The push button triggers the relay which in turn holds itself using one of the contacts to bypass the pushbutton.
If 12 V fails, the relay will turn off, staying off until the push button is manually re-triggered.

Harald
 

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Last edited:

duke37

Jan 9, 2011
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Motor contactors are made in this way and have a green button to start and a red button to stop.
Some electrical machines have this system fitted so they do not start on their own if power is re-connected.
A search in your country should provide sources.
 
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