The RCM420-D-2 is a residual current monitor from Bender, part of the LINETRAXX® series. It is designed for earthed systems (TN and TT systems) to monitor earth fault currents (residual currents) in AC systems. When the residual current exceeds the preset threshold, the device triggers an alarm but does not disconnect the power supply, ensuring continuous system operation. The device is a Type A residual current monitor, sensitive to both AC and pulsating DC residual currents, and complies with IEC 62020 and IEC 61557‑9.
Technical Specifications
· Response value (IΔn): AC 10 mA … 10 A, 42…2000 Hz
· Supply voltage (Uₛ): AC/DC 70…300 V
· Power consumption: ≤ 4 VA
· Relay contact rating: AC 250 V, 5 A
· Software version: DX240 V1.20
· Mounting: DIN rail (35 mm standard rail)
· Terminal type: Push‑wire terminals
· Country of origin: Germany
Key Features
· Monitors residual current in AC systems; adjustable response value from 10 mA to 10 A
· Frequency range 42…2000 Hz, suitable for applications with variable‑frequency drives and other wide‑frequency systems
· Type A residual current monitor, sensitive to both AC and pulsating DC residual currents
· Relay output for alarm or signalling
· Wide supply voltage range AC/DC 70…300 V
· LED status indicators
· Push‑wire terminals providing gas‑tight, vibration‑resistant connections
Approvals
· CE
· RoHS
· UL Listed
Standards Compliance
· IEC 62020
· IEC 61557‑9
Typical Applications
· Residual current monitoring in earthed systems (TN/TT systems)
· Earth fault monitoring in industrial electrical systems
· Residual current monitoring in variable‑frequency drive systems
· Electrical fire prevention in building installations
· Alarm systems and safety equipment
· Data centres and air conditioning systems
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