Motor Starting Auto Transformers with fixed tapping are used in auto transformer type of starters to reduce the voltage across the motor terminals while starting. This transformer uses high quality E.I laminated silicon steel processed from state of the art modern punching facilities, high quality enamelled/fibre glass covered copper or aluminium wires of 1 PEW and EIW grades withstand temperatures up to 155°C & 180°C respectively and high quality polyester varnish for good bonding & high dielectric strength, which reduces electrical leakage and noise. These transformer features open frame construction, three coil design and class F Insulation. Its primary function is to limit inrush current and starting torque in AC motors under starting or locked rotor conditions. This eliminates the problems associated with line voltage drop, resulting from high inrush currents.