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RCMB300-series_D00372_01_M_XXEN/06.2019
3. Device description
3.1 Area of application
The residual current monitoring modules of the RCMB300 series are intended for meas-
uring AC and DC fault currents in earthed systems (TN and TT systems). The modules are
able to measure residual currents up to I
Δ
= 20 A in a frequency range of DC…100 kHz.
Two separately adjustable response values allow a distinction to be made between pre-
warning and alarm. When the response value I
Δn1
(prewarning) is reached, the output
relay K1 switches. When the response value I
Δn2
(alarm) is reached, the output relay K2
also switches.
The modules feature an RS-485 interface with Modbus RTU which can be used to trans-
fer measured values and alarm values. Setting parameters is also possible via this inter-
face.
The residual current monitoring modules each consist of the RCMB301 evaluation elec-
tronics and a CTBC20(P)…210(P) series measuring current transformer.
To assemble a complete module, both the electronics and a measuring current trans-
former are required. If ordered separately, these two components must then be
plugged together and calibrated during commissioning.
The CTBC…P series measuring current transformers feature an integrated magnetic
shield and are suitable for applications with high load currents or inrush currents.
3.2 Device features
• Continuous residual current monitoring in compliance with DGUV Vorschrift 3
(German Social Accident Insurance Regulation 3)
• Easy DIN rail or screw mounting
• RS-485 interface with Modbus RTU (reading out measured values/setting parame-
ters)
• Integrated switching outputs with two changeover contacts K1 and K2 (galvani-
cally isolated)
• Frequency range DC…100 kHz
• Combined test and reset button
• Multicolour LED indicating operation, exceeded response value, disturbances and
status messages
• AC/DC sensitive type B measured value acquisition acc. to IEC 60755
• AC/DC sensitive type B+ measured value acquisition acc. to VDE 0664-400
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