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Connecting a Single Phase Motor to a Contactor


By Dave Rongey - Summary:

How do I connect a single phase contactor to power an electric motor?


How Contactors are Wired to Control Single Phase Motors

Question: How do I connect a single phase contactor to power an electric motor?

This electrical question came from: Tobi, a Homeowner from Warri, Idaho.
See more about Home Wiring for Idaho

Dave’s Reply:
Thanks for your electrical question Tobi.
Electrical Wiring for Single Phase Motor Controls
Tobi, a motor control is simply a relay contactor that acts as a switch which is activated by a different power source or a control circuit. The control circuit may be operated manually, or automatically when the control circuit is wired through sensors or other control devices.  The single phase contactor is sized according to the electric motor voltage and amperage, and the control circuit is designed for the specific type of devices that will be used to control the single phase motor. The control circuit is typically a lower voltage than the motor voltage.

The Following links will assist you with your electrical question:

All About Electrical Control Relays for Motors
electrical-relays

Understanding Electrical Relays

The use of relays that are sometimes needed to control special device loads such as Air Conditioners and other high demand equipment from starting at the same time.

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2 Responses to “Connecting a Single Phase Motor to a Contactor”
  1. kaushik says:

    I would like a single phase contactor wiring diagram.

    • Dave Rongey says:

      Hi Kaushik,
      It would be helpful to know a little more about the application that you are installing or working with.
      A typical control circuit for a single phase motor is typically a lower voltage than the motor circuit itself. Often the control circuit is from a transformer which may be powered by the primary motor circuit, however the control circuit has it’s own over current protection, such as a fuse or circuit breaker. The control circuit typically is wired to a switch that will then send power to the coil of the relay contactor, which then turns on the motor.
      Please refer to the Control Relay information which may help you as well.
      I hope this helps you,
      Dave


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