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Contactors come with a built in magnetic coil used to conduct electricity look on the top edge of the connector for a plastic tab containing information about the coil many devices require a 240 volt current to function so you will need a contactor with a 240 volt coil contactors are available online and at many big hardware stores. Note that always connect the earth wire to the electric motor body in the above contactor wiring diagram i did not shown any type of step down transformer or neutral wire for magnetic contactor coil because i use a 440 volts contactor in above circuit diagram however you can learn some more from below links also read. The main advantage in using a contactor is that the switch can be powered by a different and lower power source from the main contactor power supply in other words a 120 volt alternating current commonly referred to as a 120 vac is wired to the coil of the contactor. How to wire a contactor with a volt coil by gk bayne air conditioner contactor wiring diagram hindi save wiring a contactor is a safe method for controlling electrical power typically a contactor is activated by a remote switch or other controlling electrical device the main advantage in using a contactor is that the switch can be . How to wire a contactor and overload how to wire a contactor and motor protection switch you must watch this video dol motor starter with 230v contactor coil use transformer if you need to