For three-phase motors we always wire contactor, this post help you with 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 the contactor in PC. It is important to share with you these images but you can not learn clearly without a diagram.
How To Wire a Contactor With Overload relay
In the above image, I wire a contactor and a 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 much in contactor wiring or contactor installation but you can not learn completely without a diagram. So in the below contactor wiring diagram, I have shown a contactor with a thermal overload relay, 3-phase motor and NC, NO push button switches with a complete wiring method.
In the above diagram, I showed the 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 show any type of step-down transformer or neutral wire for the magnetic contactor coil because I use a 440 volts contactor in the above circuit diagram, however, you can learn some more from the below links.
I hope you learn something from this post and now you will be able to wire a contactor for 3 phase motor, however, I will soon write about more power wiring diagrams.