Why Choose the ABB CT-SDS.23S Star-Delta Timer Relay?
The ABB CT-SDS.23S 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.23S 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 providing a defined transition from star to delta operation.
With a rated control supply voltage of 380–440 V AC and 2 N/O output contacts rated at 250 V / 4 A, the CT-SDS.23S provides reliable switching and timing control in industrial automation and motor control panels. Its compact 22.5 mm housing and screw terminal connections are designed for straightforward DIN-rail installation.
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.
- 380–440 V AC control supply for compatible industrial motor control systems.
- 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.
- 380–440 V AC rated control supply.
- 0.05 s to 10 min selectable time range.
- 7 selectable timing ranges.
- 50 ms fixed transition time.
- Precise adjustment using front-face operating elements.
- Three LEDs for operating status indication.
- Screw connection technology with double-chamber cage connection terminals.
- Tool-free mounting and demounting on DIN rail.
Reliable Star-Delta Motor Starting Control
Star-delta timer relays such as the ABB CT-SDS.23S provide controlled sequencing for three-phase motor starters. The timer controls the change-over sequence between the star and delta stages, allowing a defined starting period followed by normal delta operation.
The CT-SDS.23S combines selectable timing periods with a fixed 50 ms transition time, helping provide a controlled switching sequence for industrial motor control systems. Its compact DIN-rail format and screw terminal connections allow straightforward integration into electrical 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.
