ABB RD2-48 2CSM242120R1201 Residual Current Monitor

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1. Product Overview

The ABB RD2-48 / 2CSM242120R1201 is a high-performance Residual Current Monitor (RCM) designed to detect leakage or residual currents in industrial and building electrical systems. The RD2-48 provides precise, continuous current monitoring with alarm and relay outputs, helping prevent electrical fires, electric shocks, and equipment damage. Its compact size and easy installation make it ideal for power distribution, industrial automation, and building safety systems.

2. Main Technical Specifications

• Manufacturer: ABB

• Model: RD2-48 / 2CSM242120R1201

• Product Type: Residual Current Monitor (RCM)

• Monitoring Type: AC / DC / AC+DC residual current

• Rated Monitoring Current (Ir): 30 mA – 1000 mA selectable

• Supply Voltage: AC 110–240 V / DC 24 V (depending on model)

• Relay Output: 1 NO contact

• Alarm Response Time: ≤ 100 ms

• Operating Temperature: -25 °C to +60 °C

• Protection Class: IP20

• Mounting: DIN rail

• Standards Compliance: IEC 62020, IEC 61008

3. Advantages and Features

1. High-Precision Leakage Monitoring
   Detects small leakage currents and triggers alarms promptly for enhanced safety.

2. Fast Response
   Short relay response time ensures rapid disconnection or alarm during electrical faults.

3. Flexible Alarm Function
   Can interface with PLCs or control systems for remote monitoring and automation.

4. Compact Design
   DIN rail mounting saves space and facilitates integration into industrial control panels.

5. Reliable and Durable
   Industrial-grade design suitable for high temperature, humidity, and harsh environments, ensuring long-term stable operation.

4. Typical Applications

• Industrial production and automation distribution systems

• Building and residential electrical safety monitoring

• Substation and distribution board residual current protection

• Power equipment, pumps, fans, and motor monitoring

• Data centers and communication facility electrical safety

5. Installation and Operation Notes

1. Verify that the rated monitoring current, supply voltage, and relay output match the system before installation.

2. Follow wiring diagrams carefully to ensure correct connection of power, load, and alarm interfaces.

3. Install in a dry, ventilated environment; avoid dust, moisture, and corrosive gases.

4. Perform functional tests before commissioning, including residual current detection and alarm output.

5. Regularly inspect terminals and relay output to ensure long-term reliable operation.

The structure and details of the product：

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