Contactor Circuits Diagrams. A1 and a2 are magnetic coil terminals. 800 x 600 px source.
Effectively looking the start button closed. Wiring a contactor diagram wiring diagram is a simplified enjoyable pictorial representation of an electrical circuit. The circuit that applies the voltage to the coil is referred to as the control circuit because it controls the main device that the contactor or relay is switching.
Shut off the main power.
Starter contactor starter contactor aka starter relay is an intermittent duty relay meaning it is designed to be turned on only for short periods of time. The disadvantage of this circuit is when the motor is running. In the above contactor wiring diagram i have shown a 3 phase 440 volts 4 wire system. Figure 1 is a typical wiring diagram for a three phase magnetic motor starter.