BENDER RCM420-D-2 Residual current monitor

1. Product Description

The RCM420-D-2 is designed to detect residual currents ($I_{\Delta}$) in electrical installations. It measures the sum of currents through a connected external through-type current transformer. By providing real-time monitoring and two separately adjustable response values (pre-warning and main alarm), it allows maintenance teams to react to faults before they lead to unexpected shutdowns.

2. Technical Parameters

3. Product Advantages

• Preventive Maintenance: Detects insulation deterioration at an early stage, preventing fire hazards and system downtime.

• High Flexibility: Wide range of adjustable response values ($10 \text{ mA}$ to $10 \text{ A}$) and time delays.

• Real-time Visibility: The LC display shows the currently measured residual current, making troubleshooting much faster.

• Selectivity: Adjustable time delays help avoid "nuisance tripping" caused by transient currents.

• Communication: RS-485 interface allows for integration into building automation and remote monitoring systems.

4. Key Applications

• Data Centers: Continuous monitoring of power distribution units (PDUs) to prevent unexpected server outages.

• Industrial Plants: Monitoring of motor feeders, production lines, and sensitive electronic equipment.

• Hospitals: Ensuring the reliability of power in non-medical areas (for medical locations, Bender’s EDS/IPS systems are used).

• Renewable Energy: Monitoring of solar inverters and wind turbine control circuits.

• Building Management: Fire protection in public buildings by monitoring leakage currents.

5. Important Safety Precautions & Notes

• Current Transformer (CT) Selection: The RCM420-D-2 must be used with a compatible Bender CTBC series or W series measuring current transformer.

• Installation: All current-carrying conductors (L1, L2, L3, and N) must pass through the transformer. The PE (protective earth) conductor must not pass through the transformer.

• Setting the Threshold: Ensure the response value is set above the system's inherent leakage current to avoid false alarms.

• Testing: Regularly use the "Test" button to verify the functional integrity of the device and the output relays.

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