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Title: Is there a solid state relay that will do this?
Post by: gadget-evilusions on January 26, 2010, 01:03:55 PM

I am building some lights, that when power is knocked out will get power from a 12v battery pack and illuminate. I plan on using a relay between the battery and led light board. Is there a solid state relay type that will keep the circuit open as long as I apply 12v to the input of the relay, and then if the 12v supply is lost, will close the circuit between the battery and leds? I know I can use a mechanical relay but these will be powered for about 6 weeks straight while our haunted house is open.

Title: Re: Is there a solid state relay that will do this?
Post by: JonnyMac on January 26, 2010, 03:21:19 PM

I don't think so, Brian. What you need is a normally-closed relay, and so far as I know DC SSRs always act like normally-open.

Title: Re: Is there a solid state relay that will do this?
Post by: JackMan on January 26, 2010, 04:07:27 PM

There is such an animal. DigiKey has some SPDT and N.C. solid state relays but they might be specail order. Here's some info on another 12VDC SPDT solid state.

EFX-TEK

TEK Talk => Miscellany => Topic started by: gadget-evilusions on January 26, 2010, 01:03:55 PM