STAR DELTA connection Diagram and Working principle STAR DELTA connection Diagram and Working principle. Descriptions: A Dual starter connects the motor terminals directly to the power supply. Hence, the motor is subjected to the full voltage of the power supply. Consequently, high starting current flows through the motor. This type of starting is suitable for small motors below 5 hp (3 kW). Star Delta Starter - (Y-Δ) Starter Power, Control and Automatic Star Delta Starter with Timer Wiring & Installation Diagram. From the left you have the Main Contactor with the Pneumatic Timer because your Main Contactor is always energized, in the Middle you have the Delta Contactor with a Thermal Overload for Motor Protection in case the Motor exceeds the Amp rating set on the Thermal Overload,..
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