Stephen, If you plan to use a magnetic switch, a contactor, the pressure switch will be used to power up the coil, not the motor. So you will need to find a contactor with a 220v coil. IF you use a 110v coil, then make sure you only run 110v to the pressure switch and wire up the contactor with 220v.
That said, when the pressure switch on my 5 hp compressor went out I couldn't find a switch rated at 5 hp. 3 hp was the largest. So I connected leg 1 of the power in to both sides of the pressure switch and both sides of the out side of the pressure switch which got connected to leg one of the motor. Leg 2 of the power got connected directly to the other leg of the motor. Basically, the pressure switch only turned on and off one side of the 220v. That was 6 years ago. Switch is working just fine.
If anyone has a source of a 5 hp pressure switch, please post. I got my 3 hp switch from grangers. George
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