1SVR508210R0100

The ABB 1SVR508210R0100 (CT-SAC.22) is a high-quality electronic star-delta timer relay designed for reliable three-phase motor starting and industrial automation applications. Manufactured by ABB, this timer belongs to the CT-C series and provides a dedicated star-delta changeover function with four adjustable timing ranges covering 0.05 seconds to 10 minutes. It features an adjustable star-to-delta transition time ranging from 20 to 100 milliseconds, allowing flexible coordination between star and delta contactors. The timer operates with a rated control supply voltage of 24–240V AC or 24–48V DC and features two normally open (2 NO) output contacts rated at 250V and 4A.

The ABB CT-SAC.22 star-delta timer relay is designed for motor starter circuits requiring automatic switching from star to delta operation after a selected starting interval. During motor starting, the star connection helps reduce the initial starting current. Once the selected time has elapsed, the timer initiates the changeover sequence to delta operation.