What Is a Star-Delta Starter?


Quick Answer

A star-delta starter is a device that enhances the efficiency of a three-phase motor. The device limits the electrical current to the motor on startup while allowing full voltage when the motor reaches full speed.

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Full Answer

The electrical current required to start any heavy-duty electric motor may be four times greater than its normal operating power requirement. When a three-phase motor starts up it is necessary to regulate this electrical current, changing the connections from "star" to "delta" at exactly the right moment. A star-delta starter is a special circuit that regulates these winding electrical configurations. As the most commonly used reduced voltage starters, the star-delta starter reduces startup wear and tear on motors, making them last longer.

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