Answer for USA, Canada and countries running a 60 Hz supply service.
Wiring of air compressor's pressure switch to a contactor.
Connect a 240 volt supply from the two pole breaker in the distribution panel to the top terminals L1 and L2 on the magnetic contactor.
Take a control wire from one of the line terminals L1 to one side of the contactor's coil.
Take another control wire from the second line terminal L2 and put it to one side of a N.C. contact on the overload block.
From the other side of the N.C. contact on the O/L block take a control wire to the N.C. terminal on the air compressor's pressure switch.
From the other side of the N.C. contact on the pressure switch's terminal connect the control wire to the other side of the contactor's coil.
This configuration will be using the same coil voltage on the contactor as that of the supply voltage.
From the overload block line terminals T1 and T2 connect a cable to the motor's terminal box and connect.
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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