The contactor’s purpose is to send 230 Volts to the Air Conditioning Condenser and out door fan motor.
It is basically a switch that is located in the outdoor part of the air conditioning unit. The “switch” consists of a control coil, a metal plunger, and one or more sets of electrical contacts. the switch turns the unit on and off as required to keep the home at the desired temperature.
Single Pole / Phase Contactor
Double Pole / Phase Contactor
Three Pole / Phase Contactor