By temporarily connecting the motor windings in star configuration during startup and then switching to delta for normal operation, this proven motor control method reduces starting current by approximately 33%, protecting both the motor and the electrical supply system from. By temporarily connecting the motor windings in star configuration during startup and then switching to delta for normal operation, this proven motor control method reduces starting current by approximately 33%, protecting both the motor and the electrical supply system from. The article discusses various methods of reduced voltage motor starting used to limit inrush current in induction motors, including autotransformer starting, wye-delta starting, and electronic soft starting. It outlines the principles, control circuits, and operational differences among these. Amatrol's Multimedia Courseware – Reduced Voltage Starting (M17403) teaches learners essential reduced voltage starting concepts applicable throughout modern industry. AC electric motors are essential in a wide variety of industrial, commercial, and residential applications. Learners using. The reduced voltage motor starting method utilizes various schemes and components including a motor starter with a built-in autotransformer with automatic tap changers, contactors connected in star-delta configuration or solid-state device. These components limit the initial voltage supplied to the. Wye/delta: this starter consists of three contactors – main (for isolation); wye (lower voltage for start); and delta (higher voltage for run) – which provides for initial starting of the motor via a wye (“star”) connection, then a timed transition to a “delta” connection to produce motor. Star delta starters are one of the most effective and economical methods for starting three-phase induction motors, particularly for medium to large motors ranging from 5 HP to 200 HP. Reducing the power reduces potentially damaging electrical and mechanical shocks on the system. As the name implies, starters "start" motors.