ABB 1SVR730210R3300 CT-SDS.22S star-delta timer relay

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ABB 1SVR730210R3300 CT-SDS.22S

ABB 1SVR730210R3300 CT-SDS.22S is an electronic star-delta timer relay from the ABB CT-S timer series. It is designed for automatic star-delta motor starting applications, providing controlled switching between star and delta contactors to reduce motor starting current.

Product Information

• Manufacturer: ABB
• Model: CT-SDS.22S
• Order Code: 1SVR730210R3300
• Product Type: Electronic Timer Relay
• Function: Star-Delta Changeover Timer
• Series: ABB CT-S Timer Range
• Mounting: DIN rail mounting
• Connection: Screw terminals

Technical Specifications

Parameter	Specification
Supply voltage	24–48 V DC / 24–240 V AC
Timing range	0.05 seconds – 10 minutes
Function	Star-delta transition
Transition time	Fixed 50 ms
Output contacts	2 × normally open (2 n/o)
Contact rating	250 V AC / 4 A
Protection degree	Housing IP50, terminals IP20
Width	22.5 mm
Height	85.6 mm
Depth	103.7 mm
Operating temperature	-25 °C to +60 °C
Mounting standard	IEC 60715 DIN rail

Functional Description

The ABB CT-SDS.22S provides a dedicated star-delta starting sequence:

1. Motor starts in star connection to limit inrush current.
2. After the preset delay time, the relay switches control signals.
3. The motor changes to delta connection for normal operation.
4. A fixed 50 ms transition delay helps prevent simultaneous star and delta contactor activation.

Applications

• Industrial motor starters
• Pumps and fans
• Compressors
• Conveyors
• HVAC systems
• Machine automation control panels
• Motor control centers (MCC)

Advantages

• Wide universal supply voltage range
• Compact 22.5 mm DIN rail design
• Reliable electronic timing control
• Suitable for industrial automation environments
• Easy integration into control cabinets

Conclusion

The ABB CT-SDS.22S (1SVR730210R3300) is a compact and reliable star-delta timer relay designed for industrial motor control applications. With adjustable timing from 0.05 s to 10 min, dual normally-open outputs, and universal AC/DC supply compatibility, it is widely used in automation systems requiring smooth motor starting and reduced electrical stress.