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Ask an Expert Forum Which relay should I get?
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Which relay should I get?

Former Member
Former Member over 11 years ago

Hi all, here's my situation.

 

I have a work trailer. I use the power from the job site to power up my trailer 120 VAC, usually 15A, or 30A breaker.

 

I wish to have both my air compressor and little bar fridge powered up. But I don't want power to both at the same time.

 

The compressor starts up whenever the air tank's pressure is too low.

 

So, I would like to connect a relay to the compressor's line.  Whenever the compressor is powered up, the power to the bar fridge is cut. And when the compressor is stopped, the power is returned to the fridge.

Compressor is rated 10A, and I'll just assume the bar fridge is rated 7A or so.

 

So, I know I need a relay that is normally closed.

I would also prefer a solid state relay for durability.

If at all possible, a panel mounted relay would be prefered.

But that's pretty much all I know. When trying to search for such a relay, I just get so confused with all the specs and all.

 

Can anybody here help?

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  • dougw
    0 dougw over 11 years ago

    Hi Guy,

    Farnell sells lots of large SSRs like this one (http://www.farnell.com/datasheets/1512254.pdf)

    To supply the low voltage DC in an inverted way (normally closed) maybe you could do something like this:

    The lower wall wart is powered when the compressor is powered. If both wall warts are on - the SSR is off.

     

    image

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