Description
Product name:RCM420-D-2 Bender output module
Product details:
The RCM420-D-2 is part of the LINETRAXX® series. It measures residual currents using an external measuring current transformer (CT). It features a digital display for real-time current monitoring and two separately adjustable response values (pre-alarm and main alarm).
2. Technical Parameters
| Feature | Specification |
| Supply Voltage ($U_s$) | AC 70…276 V / DC 70…276 V (42…460 Hz) |
| Monitored Frequency Range | 42…2000 Hz |
| Measuring Range ($I_{\Delta n}$) | 10 mA…10 A |
| Response Value $I_{\Delta n1}$ (Pre-alarm) | 50…100% of $I_{\Delta n2}$ |
| Response Value $I_{\Delta n2}$ (Alarm) | 10 mA…10 A |
| Time Delay ($t_{on}$) | Adjustable 0…10 s |
| Operating Mode | Continuous operation |
| Output Relays | 2 changeover contacts (K1 for Alarm, K2 for Pre-alarm) |
| Display | Multi-functional LCD with backlight |
| Mounting | DIN rail (IEC 60715) |
3. Key Product Advantages
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Early Fault Detection: Detects insulation deterioration at an early stage, preventing unexpected system shutdowns.
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High Sensitivity: Capable of measuring very small leakage currents (down to 10 mA), making it ideal for fire protection and equipment safety.
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Versatility: Works with various Bender CTs (e.g., CTBC, W series) to accommodate different cable diameters.
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True RMS Measurement: Provides accurate readings even in systems with harmonic distortions.
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History Memory: Stores the maximum measured value since the last reset, helping technicians diagnose intermittent faults.
4. Product Applications
The RCM420-D-2 is widely used in industrial and commercial sectors where power continuity is critical:
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Data Centers: Monitoring server racks to prevent sudden power loss.
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Industrial Plants: Protecting motors and heavy machinery from ground faults.
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Hospital Facilities: Ensuring electrical safety in non-critical medical areas.
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Public Buildings: Fire prevention by monitoring leakage currents in electrical installations.
5. Important Notes & Precautions
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System Type: This device is designed for grounded systems (TN/TT) only. It cannot be used in ungrounded (IT) systems.
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CT Selection: All current-carrying conductors (including the neutral $N$ conductor, but not the PE) must pass through the measuring current transformer.
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Wiring Integrity: Ensure the connection between the RCM and the CT is secure and follows the specified cable length limits to avoid measurement errors.
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Testing: Use the built-in “Test” button regularly to ensure the internal circuitry and output relays are functioning correctly.

Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
We have the same series of models in stock. If you don’t find the model you need, please contact us and we will provide you with an official quotation!
Colour:new Warranty: 12 months
Lead Time:3-day working day Country of origin: Sweden
Price: Please contact us Product weight:0.515kg
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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Full 12-month warranty on all components
Dedicated after-sales support
Same-day dispatch on 1000s of parts
All units are fully tested
- 1. Email confirmation
You will get an email confirming that we have received your enquiry. - 2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition. - 3. Your quote
You will receive a comprehensive quote tailored to your specific needs.




Full 12-month warranty
Available for dispatch immediately
We deliver worldwide