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The theory of applying reduced voltage to a motor to alter the motor torque and power consumption characteristics has existed for many years.Motor STAR – DELTA Starter Working principle. A Dual starter connects the motor terminals directly to the power supply. Hence, the motor is subjected to the Star Delta Starter Firstly, the stator winding is connected in star and then in Delta so that the starting line current of the motor is reduced to one-third In star connection, the phase voltage is 1/v3 times of line voltage as the torque is directly proportional to the square of the voltage applied the torque is Star Delta Starter? Working principle,Theory, Circuit Diagram · 1) During the working of the starter, two contactors remain closed. · 2) The third contactor is