How To Wire Contactor And Overload Relay - Contactor Wiring
In above contactor wiring diagram i shown 3 phase 440 volts 4 wire system. I take one phase and neutral wire for MC coil which 220V, but always wire your contactor coil regarding coil voltage / current requirements. If coil required 110V to 120V then provide 110 volts supply and if it is want 380 volts to 440V to energize then connect same required supply. The coil voltage cheat- is near- in coil supply terminal/connection so check it first before starting.
In overload relay we have to option which NC and NO. When the flow of electron is high ring- from it's value the NC points change its direction and make an open circuit or broke- the circuit. Which are shown in above image with 95-NC-96.