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  • RCMA423

    Digital ground fault monitor for grounded and high-resistance grounded AC/DC systems

    The RCMA423 monitors for ground fault current in grounded and high-resistance grounded AC systems, both single-phase and three-phase, as well as pure DC and mixed AC/DC systems. The RCMA423 reads a true RMS value, and displays the read ground fault current in real-time on the built-in digital display. The RCMA420 features a steplessly adjustable setpoint from 30 mA to 3 A. Along with the main alarm value, a prewarning alarm, set as a percentage of the main alarm value (50 to 100%), may be set.

    All settings for the device are changed via the device's onboard, easy-to-use menu. Three separate time delays may be utilized - a trip delay (0 to 10 s), a startup delay (0 to 10 s), and a delay on release (0 to 99 s). Two SPDT alarm relays may be set to normally energized or normally de-energized operation, and may be set to latching or non-latching operation. An external BENDER current transformer is required for operation.

    Compatible current transformers include the entire WAB series.

  • Key Features: RCMA423

    • Ground fault monitoring for grounded and high-resistance grounded AC/DC systems
    • True RMS reading
    • Digital display showing ground fault current in real-time
    • Adjustable response value from 30 mA to 3 A
    • Many different current transformer sizes available
    • Built-in test and reset button
    • Connections for external test and reset
    • Optional versions with analog outputs
    • Adjustable time delays for response delay, startup delay, and delay on release
    • Latching or non-latching operation, selectable
    • 2 SPDT Form-C contact outputs, normally energized or de-energized operation, selectable

  • Applications: RCMA423

    • Ground fault detection in grounded and high-resistance AC/DC systems
    • Branch monitoring
    • Variable frequency drives (VFDs)
    • Batteries and battery backup systems
    • Motors and motor control systems
    • Generators, portable and fixed
    • Alarm systems, safety devices
    • General industrial systems
    • Controls and control systems
    • Heat tracing systems

  • Ordering information: RCMA423

    NameResponse Value0...400 μA analog output0(4)...20 mA analog output0...10 V analog outputSPDT contact outputSupply VoltageOrdering Number
    RCMA423-D-130...3000 mA 2AC 16...72 V (42...460 Hz) DC 9.6...94 V B94043023
    RCMA423-D-230...3000 mA 2AC 70...300 V (42...460 Hz) DC 70...300 V B94043025

  • Downloads: RCMA423

    Document Name Document No. Date Download
    Technical Bulletin / Datasheet
    RCMA423    		 NAE1042070 04.2013
    Download
    Installation Bulletin
    RCMA423    		 NAE1048070 09.2011
    Download
    User Manual
    RCMA423    		 TGH1442en 06.2012
    Download
    Brochure
    Overview - Protection Relays    		 NAE1001450 04.2013
    Download

  • Accessories: RCMA423

    AC/DC Current Transformers

    Current transformers for RCMA420, RCMA423, and RCMS series ground fault monitors (AC/DC systems)

    NameOrdering Number
    W20ABB98080008
    W35ABB98080016
    W60ABB98080016
    W120ABB98080041
    W210ABB98080040
    Connector Cables

    Connector cables for RCMA and RCMS series ground fault monitors

    NameOrdering Number
    WX-100B511100033
    WX-250B511100032
    WX-500B511100031
    WX-1000B511100034