Video- How Does A Star Delta Motor Starter Contactor Work?

by Editor on November 3, 2011

Why do we start to run a motor initially in Star mode and then change to Delta mode?

How does a Star-Delta Starter work an electric motor?

If we run a motor directly in Delta mode the current can be 4 times as higher and cause a very heavy torque on the motor. You would also need a larger contactor and cable size to cope with the heavier current at start up.

The solution is to run initially in star mode and then switch over to Delta once the motor is running by using a Star-Delta motor starter contactor.

More info about basic Star and Delta motor connections.

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