1SVR508211R0100

ABB CT-SDC.22 Star-Delta Electronic Timer Relay, Part Number 1SVR508211R0100, a compact industrial timing device designed for three-phase motor starting applications, industrial automation systems, motor control centers (MCC), and electrical control panels.

The ABB CT-SDC.22 belongs to ABB's CT-C series of electronic time relays and features a dedicated star-delta timing function. It is designed to control the transition between star and delta contactors during the starting sequence of three-phase induction motors, helping reduce motor starting current compared with direct-on-line starting.

The timer provides seven selectable timing ranges covering 0.05 seconds to 10 minutes. A fixed transition interval of 50 milliseconds provides a defined pause between star and delta operations, supporting the required contactor switching sequence.