ABB 2CSM142120R1201 RD2 Type A 2000mA 230-400V AC DIN-Rail Residual Current Monitoring Relay

The ABB RD2 (SKU: 2CSM142120R1201) is a Type A residual current monitoring relay designed to continuously monitor insulation integrity and earth leakage currents in AC electrical installations. Rated for residual currents up to 2000 mA across a supply voltage range of 230–400 V AC, the RD2 provides reliable early-warning protection for industrial control panels and distribution systems, enabling preventive maintenance before a fault escalates to a trip event.

Technical Specifications

Certifications & Standards

• RoHS: Compliant with EU Directive 2011/65/EU on restriction of hazardous substances in electrical and electronic equipment
• EU Directive 2011/65/EU: Verified RoHS compliance declaration for the European market
• REACH: Compliant with EU REACH regulation on chemical substance safety
• WEEE: Registered and compliant with EU Waste Electrical and Electronic Equipment Directive
• IEC EN 62020: Designed and tested to IEC EN 62020 — the international standard for residual current monitors (RCMs)
• EN 62020: Meets the European harmonised standard for electrical accessories and residual current monitors

Applications & Use Cases

The ABB RD2 residual current monitoring relay is widely deployed in industrial automation, commercial building management, and infrastructure applications where continuous leakage current surveillance is critical. Typical applications include monitoring of motor feeder circuits, IT and TN earthing systems, uninterruptible power supplies (UPS), data centre power distribution, HVAC control panels, and process manufacturing lines where unplanned shutdowns must be avoided. By providing an early warning output before the leakage current reaches the disconnection threshold, the RD2 enables maintenance teams to schedule corrective action without interrupting production.