Why Choose the ABB CT-SDS.22S Star-Delta Timer Relay?
The ABB CT-SDS.22S is a compact and reliable electronic star-delta timer relay designed to provide controlled motor starting sequences in industrial control, automation and electrical systems. As part of the ABB CT-S timer relay range, it provides a dedicated star-delta timing function with two normally open outputs for controlling the transition between star and delta motor configurations.
The CT-SDS.22S provides 7 selectable time ranges from 0.05 s to 10 min, together with a fixed 50 ms transition time. This allows the relay to control the timing sequence of star-delta motor starters while helping limit starting current and provide a controlled transition to normal motor operation.
With a rated control supply voltage of 24–48 V DC / 24–240 V AC and 2 N/O output contacts rated at 250 V / 4 A, the CT-SDS.22S provides reliable switching and timing control in industrial automation and motor control panels. Its compact 22.5 mm housing is designed for straightforward DIN-rail mounting.
Key Advantages
- Compact star-delta timer relay for industrial motor starting applications.
- 7 selectable time ranges from 0.05 s to 10 min for flexible timing control.
- 50 ms fixed transition time between the star and delta switching stages.
- 24–48 V DC / 24–240 V AC control supply for versatile installation.
- 2 N/O output contacts rated at 250 V / 4 A.
- Compact 22.5 mm wide DIN-rail housing for efficient control panel installation.
Key Features
- ABB CT-S timer relay range.
- Star-delta timing function.
- 2 N/O output contacts.
- 24–48 V DC / 24–240 V AC rated control supply.
- 0.05 s to 10 min selectable time range.
- 7 selectable timing ranges.
- 50 ms fixed transition time.
- Screw connection technology with double-chamber cage connection terminals.
- Compact DIN-rail mounting design.
- Three LEDs for clear operating status indication.
Reliable Star-Delta Motor Starting Control
Star-delta timer relays such as the ABB CT-SDS.22S provide controlled sequencing for three-phase motor starters. During starting, the motor can initially operate in a star configuration to reduce starting current before the timer initiates the transition to delta operation.
The CT-SDS.22S combines selectable timing periods with a fixed 50 ms transition time, helping provide a defined switching sequence between the star and delta stages. Its compact DIN-rail format and screw terminal connections allow straightforward integration into industrial motor control panels and automation systems.
Typical Applications
- Three-phase motor starting systems.
- Industrial motor control panels.
- Machine control and automation systems.
- Pumps and pumping equipment.
- Fans and ventilation systems.
- Compressors and industrial machinery.
- HVAC equipment and process control systems.
