As you know that we use in every place AC motor for different types of work. There are main two types of AC motors which are single phase and 3 phase. A single-phase motor is a motor which is working one phase and neutral (ground) supply for doing its duty and a 3 phase motor required a 3-phase power source. However we use it mostly in our homes and for small work the one-phase motor, in this post, you will learn about the single-phase motor wiring with contactor/motor starter.
As you know that we use cont actors for 3-phase motors for controlling, and we also know the advantages of contectors, so what bad thing if we install a contactor for single phase motor? Note that we did not use a contactor for one phase motor mostly because this connection can be done by a single or double pole breaker.
But there are many benefits of a contactor,
E.g example you can easily switch on the motor by pressing a small push button switch, and you can easily switch it off by easily pushing the off button or the normal close button.
If the incoming voltage is low sometimes, the magnetic contactor will not set and your motor will be safe from burning in low voltage cases.
This is good for those countries where the load shedding problem is living, I use it in my home cont actor for my one-phase water pump motor because I am living in Pakistan and Pakistan is numbering in those countries where the load shedding is living.
So my water pump motor is installed so far away from my living room. Now I am telling my story, one day I switch on one phase water pump motor and after some time the power went off. I forgot to switch off the motor breaker and I go to the market.
At that time there is no one in my home and after some time after I left off home the electricity power come back and the motor started automatically due to the switch on the circuit breaker because I forgot to switch it off. So When I come back home and I open my home’s main door by using the key. I find that my motor was burned due to continuously working or due to the low voltage coming. I don’t know what happened.
After rewinding the electric motor, I think about the solution to this problem and was safe from this accident again and I find out the motor cont actor is the best for this work.
Now I install a magnetic contactor with My single phase motor wiring connection to switch off / on and there is no need to switch off the motor after load shedding or power went.
Single Phase Motor Wiring With Contactor Diagram
I chose a diagram to teach you online and I always try to write and design by post simple to understand. I also published 3 phase motor wiring diagram which is wired with a contactor. This wiring connection is also easy as 3-phase motor wiring.
You need to wire your normally close and normally open switch with cont actor as I wired in my last contactor diagram. But there is no change between my last diagram that I did not install the overload relay but you can use reset able overload for protecting your motor. My below single-phase motor wiring with contactor diagram is too simple that there is no need to explain it in words.
The above diagram is a complete method of single-phase motor wiring with a circuit breaker and contactor. In the above one-phase motor wiring I first connect a 2 pole circuit breaker and after that, I connect the supply to the motor starter then I do cont actor coil wiring with Normally Close push button switch and Normally Open push button switch and in last I do connection between capacitor start motor and contactor.
I think to know you will be able to do the single-phase motor wiring with the contactor after this diagram.