Star Delta Starter Control Circuit Wiring Explained.
Star delta starter is probably the most common reduced voltage starter for a 3 phase induction motor in present day use.
These starters are used in an attempt to reduce the start current applied to the motor during starting, to reduce the disturbances and interference transferred on to the electrical supply.

The Star Delta starter is manufactured using three contactors, a timer and a thermal overload.
Operation of the Star Delta starter and the control circuit wiring is explained here, with nice animation work.

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