Janitza Electronics GmbHResidual Current Monitoring Devices

RCM 202-AB

Name: RCM 202-AB
Brand: Janitza Electronics GmbH
Availability: InStock

Residual current monitoring device, Type AB

The RCM 202-AB is a dedicated 2-channel monitoring instrument that continuously watches for residual (leakage) current in TN-S electrical systems, without tripping the circuit, catching a slowly worsening insulation fault long before it becomes a fire hazard or forces an unplanned shutdown. Janitza markets it as a Type B+ unit designed to be retrofitted into existing switchboards rather than requiring a new panel build.

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Key Features

01Monitors residual current Types A, B, and B+ (AC, smooth DC, high-frequency up to 20 kHz)
02Works with conventional Type A CTs and divisible/split-core transformers
03Frequency-selective analysis: 50 Hz, pure DC, and high-frequency (up to 20 kHz) components reported separately
04Built-in LCD display with local operating controls
05Retrofit-friendly for existing main/sub-distribution boards
06Target uses: data centers, hospitals, production facilities, logistics centers

Applications

Residual Current MonitoringResidual current monitoring (RCM) measures leakage currents in the electrical system continuously, allowing insulation degradation, cabling problems and other electrical faults to be detected at an early stage. Unlike residual current devices (RCD), RCM systems do not cut power the moment a set threshold is exceeded; they monitor leakage current levels continuously and raise a warning before a developing fault reaches a critical level. In data centers, where unplanned outages are critical, this is a significant advantage for operational continuity. With Janitza RCM solutions, leakage currents can be monitored centrally, historical data can be followed and alarm levels can be defined. Continuous monitoring through GridVis makes it possible to track how insulation problems develop and to plan maintenance before a fault occurs.

Technical Specifications

RCM 202-AB

Technical Specifications · RCM 202-AB
Channels	2 (connects up to 2 residual current transformers)
Measuring range	AC/DC 10 mA – 20 A (some sources list selectable range steps 5/10/25/125 A: confirm exact steps from the datasheet)
Accuracy	~1% of measuring range (per Janitza RCM whitepaper)
Outputs	2 analog outputs, 2 alarm (limit-violation) outputs
Communication protocols	RS-485, Modbus RTU; compatible with Janitza Modbus master devices
Data storage	Measured-value and extreme-value memory with time stamps
Certifications / standards	DIN EN 62020 / VDE 0663 / IEC 62020