BENDER RCM420-D-2 Residual Current Monitor

Product Overview

Brand: BENDER
Model: RCM420-D-2
Product Type: Residual Current Monitor (RCM)
Series: LINETRAXX® RCM420
Application: Ground Fault Monitoring, Electrical Safety Protection

The BENDER RCM420-D-2 is a residual current monitoring device used in grounded TN and TT power systems. It continuously monitors AC and pulsating DC residual currents and provides alarm signals when leakage current exceeds preset limits.

Technical Specifications

Main Features

• Continuous residual current monitoring
• Detects AC and pulsating DC leakage currents
• Two adjustable alarm levels
• Digital LCD measured-value display
• Built-in self-test function
• Fault memory function
• External test/reset connection
• CT connection monitoring
• Two independent alarm relay outputs

Relay Outputs

The RCM420-D-2 provides:

• AL1: Pre-warning alarm
• AL2: Main residual current alarm

Relay type:

• 2 × changeover contacts (SPDT)

Suitable for:

• Alarm systems
• PLC monitoring
• Shutdown control circuits

Measuring Principle

The device works with external residual current transformers:

Power Circuit → Measuring Transformer → RCM420-D-2 → Alarm Relay Output

Compatible transformers:

• CTAC series
• WR series
• WS series

Applications

• Industrial power distribution systems
• Motor control centers
• Manufacturing equipment
• HVAC systems
• Data center power monitoring
• Electrical safety systems
• Factory automation equipment