LINETRAXX® RCMB300 series

The residual current monitoring modules of the RCMB300 series are intended for measuring AC and DC fault currents in earthed systems (TN and TT systems). The modules are able to measure residual currents up to IΔ = 20 A in a frequency range of DC…100 kHz.

Two separately adjustable response values allow a distinction to be made between prewarning and alarm. When the response value IΔn2 (alarm) is reached, the output relays K1 and K2 switch.

The modules feature an RS-485 interface with Modbus RTU which can be used to transfer measured values and alarm values. Setting parameters is also possible via this interface.

The residual current monitoring modules each consist of the RCMB301 evaluation electronics and a CTBC20(P)…210(P) series measuring current transformer core. To assemble a complete module, both the electronics and a measuring current transformer core are required; if ordered separately, these two components must then be plugged together and calibrated during commissioning.

The measuring current transformer cores of the CTBC20P…210P series feature an integrated magnetic shield and are suitable for applications with high load currents or inrush currents.

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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 parameters)
Integrated switching outputs with two changeover contacts K1 and K2 (galvanically 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
The AC and DC components as well as the r.m.s. value of the residual current can be evaluated separately
Exchangeable electronic enclosure without mechanical separation of the primary conductors
Extension/retrofitting or modification of functionalities in case of changed monitoring requirements
Insensitive to load currents due to full magnetic shield (CTBC20P…210P only)
Connection monitoring of the measuring current transformer with cyclical test current
Use of the RCMB301 for all CTBC… measuring current transformer sizes
Supply voltage DC 24 V

Дополнительные комплектующие для LINETRAXX® RCMB300 series

AccessoriesDescriptionArt. No.

Interface converter USB to RS-485	B95012045
Terminal block for RCMB301 module	B74043124

Voltage supplyTypemax. connected current transformersArt. No.

STEP-PS/1 AC/24 DC/0.5	4	B94053110
STEP-PS/1 AC/24 DC/1.75	14	B94053111
STEP-PS/1 AC/24 DC/4.2	34	B94053112