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Topic: Switching 120VAC with 5V (Read 1 time) previous topic - next topic

BetterSense

I need to switch a submersible 120V fountain pump with a thermostat for a water-cooling application. My thermostat has a relay output, that I can hook up with 5V or 12V DC, 500mA or so. What's the best way to switch 120V? Another relay would be fine but I don't know where to find a 120V one. I have 12V 30A automotive relays; would that work with 120VAC ok?

CrossRoads

Did you try searching at Digikey?
I found models like this
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PB323-ND
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

RuggedCircuits

The "best" way to switch 120VAC depends on the current. Do you have any idea how much current your fountain pump draws? You could go with a "power" relay (as CrossRoads suggested) or for lower currents an optically isolated triac.

A 12VDC automotive relay is unlikely to be able to withstand 120V and may be destroyed.

--
The Ruggeduino: compatible with Arduino UNO, 24V operation, all I/O's fused and protected

justjed

One of these?
http://www.mpja.com/prodinfo.asp?number=18703+RL
... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier

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