2CDS200985R0041 ABB S3C-UA 12 Undervoltage Release 12 V AC/DC

Why Choose the ABB S3C-UA 12 Undervoltage Release?

The ABB S3C-UA 12 is a 12 V AC/DC undervoltage release (UVR) designed to trip compatible ABB modular protection devices when the monitored supply voltage falls significantly below its rated value or is disconnected. Identified by ABB order code 2CDS200985R0041, it forms part of ABB's MCB accessories portfolio and System pro M compact accessory range.

Designed to provide positive-safety undervoltage protection, the S3C-UA 12 trips the associated protection device when its supply is interrupted and can also be incorporated into emergency-stop circuits using a normally closed push-button. ABB specifies the undervoltage release to operate when the voltage falls within the defined trip range of approximately 35–70% of rated voltage.

The S3C-UA 12 operates from a rated supply of 12 V AC/DC at 50/60 Hz for AC applications. It occupies approximately one DIN module with a width of 17.4 mm and is designed for right-side mounting with compatible ABB MCBs, RCCBs, RCBOs and switch disconnectors, providing a compact solution for undervoltage protection and emergency switching applications.

Key Advantages

• Provides undervoltage protection for compatible ABB modular protection devices.
• 12 V AC/DC rated operating voltage supports both AC and DC control circuits.
• Provides positive-safety operation by tripping when its control voltage is disconnected.
• Suitable for use in compatible emergency-stop circuits with a normally closed push-button.
• Compact 17.4 mm width occupies approximately one DIN module.
• Compatible with a broad selection of ABB modular circuit protection equipment.

Key Features

• ABB S3C-UA undervoltage release.
• Rated voltage: 12 V AC/DC.
• Rated frequency: 50/60 Hz for AC operation.
• Undervoltage trip range of approximately 0.35–0.70 × rated voltage.
• Positive-safety function trips the associated device if the control voltage is disconnected.
• Suitable for emergency-stop applications using compatible normally closed control circuits.
• LED indication for undervoltage-drop status.
• Compact 85 × 74.1 × 17.4 mm construction.
• Compatible with multiple ABB System pro M compact protection-device ranges.
• ABB order code 2CDS200985R0041.

Reliable Undervoltage Protection and Positive-Safety Tripping

An undervoltage release is used to trip an associated protective or switching device when the monitored control voltage falls below an acceptable level. This can help prevent connected equipment from remaining energised or automatically restarting under unsuitable voltage conditions, while the positive-safety principle ensures the associated device trips if the undervoltage release loses its control supply.

The ABB S3C-UA 12 combines this functionality with a 12 V AC/DC control supply and a compact DIN-rail accessory format. It can also support emergency-stop applications when incorporated into a correctly designed normally closed control circuit, making it suitable for professional distribution, machinery-control and safety-related switching applications using compatible ABB modular equipment.

Typical Applications

• Undervoltage protection in electrical distribution boards.
• Emergency-stop circuits using normally closed push-buttons.
• Machinery and equipment control circuits.
• ABB System pro M compact protection assemblies.
• Commercial and industrial electrical installations.
• DIN-rail systems requiring positive-safety tripping on loss of control voltage.