ABB 2CSR256040R1204 Residual current circuit breaker

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1. Product Overview

The ABB 2CSR256040R1204 is a high-performance Residual Current Circuit Breaker (RCCB) designed to detect earth leakage currents in AC systems. It disconnects the power supply rapidly in case of electric shock risk or insulation faults, ensuring protection of people and equipment. It is widely used in residential, commercial, and industrial distribution systems.

2. Technical Specifications

• Model: 2CSR256040R1204

• Product Type: Residual Current Circuit Breaker (RCCB)

• Number of Poles: 4P

• Rated Current (In): 40 A

• Rated Residual Operating Current (IΔn): 30 mA

• Rated Operational Voltage (Ue): 400 V AC

• Rated Frequency: 50/60 Hz

• Residual Current Type: Type A (sensitive to AC and pulsating DC currents)

• Rated Short-Circuit Withstand: 10 kA (with upstream protection device)

• Mounting Method: DIN rail mounting

• Mechanical Life: ≥ 20,000 operations

• Electrical Life: ≥ 10,000 operations

• Protection Degree: IP20

• Operating Temperature Range: -25°C to +55°C

• Standards: IEC/EN 61008

3. Features & Advantages

1. High-Sensitivity Earth Leakage Protection
   30mA tripping sensitivity provides effective personal shock protection.

2. Advanced Detection Capability
   Type A design detects both AC and pulsating DC leakage currents, suitable for modern electronic loads.

3. Robust and Reliable Construction
   Manufactured with ABB precision technology for long service life and stable performance.

4. Easy Installation and Maintenance
   Standard DIN rail mounting and user-friendly terminal design.

5. Clear Status Indication
   Visible ON/OFF position indicator for quick inspection.

4. Typical Applications

• Residential and apartment electrical distribution

• Commercial building lighting and socket circuits

• Industrial control panels

• Hospitals and public facility electrical safety systems

• Data centers and IT power distribution

• Renewable energy and electronic load applications

5. Installation & Safety Notes

1. Use with Overcurrent Protection
   RCCBs do not provide overload or short-circuit protection and must be used with upstream protective devices.

2. Correct Wiring Required
   Line and neutral must be correctly connected; neutrals must not be shared between circuits.

3. Regular Testing Recommended
   Press the test button monthly to ensure proper operation.

4. Avoid Harsh Environments
   Do not install in areas with high humidity, dust, or corrosive gases.

5. Installation by Qualified Personnel
   Only certified electricians should install or service the device.

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