Star Delta Starters

A Star Delta Starter is the most utilised form of motor starter being used when compared to other types of motor starting methods for induction motors. Star Delta Starters are used for cage induction motors designed to function using the delta connected stator winding. The majority of induction motors are started using the DOL method, but when very large powerful induction motors are started, they can create a disturbance of the supply line voltage due to large starting current surges. To limit this starting current surge powerful induction motors are started at a reduced voltage and then have full supply voltage reconnected when they run up to near full speed.

Star Delta Starters consists of three contactors, a thermal overload and a timer. The contactors are smaller than the contactor used in a DOL Starter as they control the winding currents only.  During starting the motor windings are connected in star configuration reducing the voltage across each winding and also the torque by a factor of three and after a short period of time the winding are reconfigured as delta and the motor runs normally.

Kempston Controls, a leading stockist of electrical and electronic components stocks a select range of Star Delta Starters from market leading brands including Crompton Controls, Schneider, Lovato, Danfoss and more. Give our dedicated sales team a call on +44 (0) 1933 411411 or use the contact form above to discuss your Star Delta Starters requirements.

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