Star Delta Starter?

Answer

A star delta starter works by starting the motor in STAR and then, when the motor has gained sufficient speed, change its connections to DELTA to allow the motor to run at its full speed. This is because the starting current of any heavy electric motor can be almost 4 times the normal current it draws when it has gained speed and reached its normal running output power and temperature.
3 Additional Answers
A star delta starter is a device that provides a starting current for any heavy electric motor to enable it to start. It is made up of large circuit breakers, three-phase power supply cables, coils and contacts. It works when the windings of the motor are connected in STAR thus making the voltage and the current` on each winding to reduce when connected directly across two incoming power service line phases in DELTA.
A star delta works when the alternator wired to the star starts off, leading to the switching off of the delta at certain revolutions per minute. This in turn helps to maximise the amount of power that is sent to the batteries and to improve the system of the machinery. Star and delta wiring is used in commercial turbine generators, because it is very efficient and cheap.
A star delta starter is manufactured from three contactors, a timer and a thermal overload. The contactors are smaller than the single contactor used in a Direct On Line starter and the currents through the winding are 1/root 3 (58%) of the current in the line. There are two contactors that are close during run, these are AC3 rated at 58% of the current rating of the motor. To view more information about how a star delta starter works, please refer to this webpage:
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