How To Wire a Contactor With Overload relay
In the above image i wire a contactor and thermal overload relay for a three phase motor, with NC and NO push button.
Note that NC means Normal Close and NO means Normal Open, in clear words NC push button is a button which is normally close circuit and NO push button is a button which is normally open electric circuit.
NC push button we use for switching off the motor and NO push button for Switching On the electric circuit or 3 phase motor.
I know these images help you very mush in contactor wiring or contactor instillation but you can not learn completely with out a diagram. So in below contactor wiring diagram i shown a contactor with a thearmal overlaod relay, 3 phase motor and NC, NO push button switches with complete wiring method.
|Power wiring diagram|
In the above diagram i shown complete method of contactor wiring and 3 phase motor wiring and wiring installation method. 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 form below links.
How to Wire a 3 Phase Motor With Contactor and Overload Relay.