Janitza RCM 201-ROGO


The Janitza RCM 201-ROGO is used for standard compliant type A measurement on DIN rails in conjunction with the RCM 202-AB to enable continuous monitoring of TN-S systems and comply with DIN EN 62020/VDE 0663/IEC 62020.  This refers to residual current monitoring devices which check circuits for the occurrence of a residual
current and trigger an alarm if a set alarm value is exceeded.The Janitza RCM 202-AB is employed with current transformers connected for the measurement and monitoring of residual currents of the types A, B and B+ in TN and TT systems (grounded AC systems).

Features include:

  • Very high levels of accuracy
  • Retrofittable
  • Seamless compatability with Janitza RCM devices
  • Standards Compliant to IEC62020
  • Alarm Function
  • RS485 (Modbus RTU) and all Janitza Modbus master devices
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For standard compliant type A measurement on DIN rails the Janitza RCM 201-ROGO can be used in conjunction with the Janitza RCM 202-AB


Measuring channels

  • Two current transformer connections (compatible with all Janitza residual current transformers)
  • AC/DC measurement range: 10 mA … 20 A


Measuring display and operation

  • Two-colour LED display (128 x 64 pixels)
  • 3-button control
  • Self test and check indicator
  • German, English and Spanish user guidance can be selected


RCM analysis variables

  • Individual limit values can be set for type A, type B, and type B+
  • Individual frequencies for 1-2000 Hz
  • Spectrum display for 2-20 kHz



  • 2 digital alarm outputs, 2 freely scalable analogue outputs



  • RS485 interface (protocol: Modbus RTU)
  • Compatible with all communications-capable Janitza Modbus master devices


High measurement accuracy

  • From 2% to final value
  • Measurement of residual currents in the measurement ranges 5 / 10 / 25 / 125 A


Standards – compliant to IEC 62020

  • Recording, evaluation and monitoring of type A residual currents



  • Rogowski RCM current transformers for large cable cross sections and busbars up to 4000 A


Alarm function

  • Configurable limit values and alarm output via digital output and Modbus

Download the Janitza RCM 201 and RCM 202-AB brochure here:

Download the 2021 Janitza Product Catalogue here:

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