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A contactor operates in a similar way to a relay the contactor contains a coil which when energized pulls in the contacts which will send output voltage to the desired device. Contactor wiring and i hope after this post you will be able to wire a 3 phase motor i also published a post about 3 phase motor wiring with magnetic contactor and thermal overload relay but today post and contactor wiring diagram is too simple and easy to learn 2 days ago i wired 380 to 440 volts contactor for a 3 phase motor and save these images of contactor in pc its is important to . 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 powered by a different and lower power source from the main contactor power supply. Contactor wiring with complete explanation in 3 power system we use some devices between induction motor and supply which are a cb circuit breaker mc magnetic cont actor or motor stater o l overload relay and nc no push button switches for on off and reset