Optimize the control of your two-speed motor applications with a Star-Delta (Wye-Delta) controller. This type of motor starter is specifically designed for motors with windings configured for two distinct operating speeds, often utilizing a Dahlander winding arrangement. The Star-Delta method provides a reduced voltage starting approach, connecting the motor windings in a star (wye) configuration initially to limit inrush current and starting torque. 1  Once the motor accelerates, the controller switches the windings to a delta configuration for full voltage operation at the selected speed. For two-speed control, the controller manages the switching between the star and delta configurations for each of the motor's intended speeds, offering a cost-effective solution for applications requiring two specific operating points with the benefit of reduced stress on the motor and electrical supply during starting.