Relay Switch Question
Originally Posted by aalansari
I'm trying to use a relay to control an instrument that uses a 120VAC source. I need to control the relay (basically the coil) using a 5V signal. So it would have to be on a normally closed circuit and when I send the 5V signal it would break the circuit and turn the instrument off. So my question is, what relay would I need ? do I need to use 2 relays in series, as in a smaller relay to handle the 5V signal and and larger one with a higher contact rating for the 120VAC circuit?
I am limited to using whatever is available at radioshack...
.. gotta dust off the cobwebs for that one. A regular single pole double throw with contacts rated at 115V ??A and coil rated for 5V?C ??A would work. Just wire the N.C. to the load. I think you will have a difficult time finding a relay with a 5 volt coil that isn't a circuit board mount.
An idea of the project would help. The way you have it described is the load would be re-energized whenever you lost the 5 Volts for whatever reason. I thought most stuff like that is done with solid state these days. Radio Shack has been pretty much a joke the last decade or so unless you wanted some high end audio or video stuff.
"Where all think alike, no one is thinking very much"
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Last edited by jschaben; 11-05-2011 at 10:44 PM.