star delta starter

This starters are normally used for motor rating above 10 HP. It starts motor in star condition and changes over to delta condition as soon as the motor reaches to nearly its full speed.

What you want? The basic operation or the diagram?

The Star delta motor starter is a reduce voltage starting operation. Injecting low voltage high current to your motor thus minimizing starting tourque of motor. You need a motor having a 12 leads out to make it work.

I want star delta starter diagram and explain how it is works?

THE ABOVE LINK IS AN EXCELLENT SOURCE OF STAR DELTA INFORMATION AND HAS THE POWER AND CONTROL DIAGRAMS