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Re: can we do it?
Don't forget that the compressor is an inductive load. Simply turning it on and off with a contact switch will result in arcing at the switch which will eventually destroy the switch (and create lots of EMI in the process) unless a suitable snubbing circuit is employed to dissipate the energy in the motor inductance.
The switch probably can't handle the currents anyways as described by eagle33199. And it's illegal as described by Billfred.
Sometimes it is very nice to have a hardware solution to a simple problem, though, isn't it...
Russ
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