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Ground Fault Products for Grounded and HRG Systems

AC/DC Systems

BENDER's RCMA series of ground fault monitors utilize the latest technology to detect ground faults on both AC and DC systems. RCMA series monitors feature digital displays which show the measured ground fault current in real-time. A wide variety of adjustable trip levels and outputs are available.

  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories

  • RCMA420

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

    The RCMA420 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 RCMA420 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 10 mA to 500 mA. 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 W20AB, W35AB, and W60AB.

  • Key Features: RCMA420

    • 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 10 mA to 500 mA
    • 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: RCMA420

    • 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: RCMA420

    NameResponse Value0...400 μA analog output0(4)...20 mA analog output0...10 V analog outputSPDT contact outputSupply VoltageOrdering Number
    RCMA420-D-110...500 mA 2AC 16...72 V (42...460 Hz) DC 9.6...94 V B94043001
    RCMA420-D-210...500 mA 2AC 70...300 V (42...460 Hz) DC 70...300 V B94043002
    RCMA420-DM-110...500 mA AC 16...72 V (42...460 Hz) DC 9.6...94 V B94043003
    RCMA420-DM-210...500 mA AC 70...300 V (42...460 Hz) DC 70...300 V B94043008
    RCMA420-DM1C-110...500 mA 1AC 16...72 V (42...460 Hz) DC 9.6...94 V B94043005
    RCMA420-DM1C-210...500 mA 1AC 70...300 V (42...460 Hz) DC 70...300 V B94043010
    RCMA420-DM2C-110...500 mA 1AC 16...72 V (42...460 Hz) DC 9.6...94 V B94043006
    RCMA420-DM2C-210...500 mA 1AC 70...300 V (42...460 Hz) DC 70...300 V B94043011
    RCMA420-DM3C-110...500 mA 1AC 16...72 V (42...460 Hz) DC 9.6...94 V B94043007
    RCMA420-DM3C-210...500 mA 1AC 70...300 V (42...460 Hz) DC 70...300 V B94043012

  • Downloads: RCMA420

    Document Name Document No. Date Download
    Technical Bulletin / Datasheet
    RCMA420    		 NAE1042050 04.2013
    Download
    Installation Bulletin
    RCMA420    		 NAE1048050 10.2012
    Download
    User Manual
    RCMA420    		 TGH1411en 03.2011
    Download
    Brochure
    Overview - Protection Relays    		 NAE1001450 04.2013
    Download

  • Accessories: RCMA420

    AC/DC Current Transformers

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

    NameOrdering Number
    W20ABB98080008
    W35ABB98080016
    W60ABB98080016
    Connector Cables

    Connector cables for RCMA and RCMS series ground fault monitors

    NameOrdering Number
    WX-100B511100033
    WX-250B511100032
    WX-500B511100031
    WX-1000B511100034
  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories

  • 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
  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories

  • RCMB101

    CCID-20 for level 2 EV chargers

    The RCMB101 is a small, PCB-style form factor CCID-20 ground fault monitor which detects both AC and DC ground faults. It is designed to be integrated into level 1 and level 2 electric vehicle charging stations. The RCMB101 is UL recognized under UL2231-2.

  • Key Features: RCMB101

    • CCID-20 for level 2 electric vehicle chargers
    • UL 2231 recognized component
    • Detects both AC and DC faults
    • Measuring range up to 20 mA
    • True RMS reading
    • Fixed undervoltage value selectable up to 500 V customizable at factory
    • Frequency range of 0 (DC) to 500 Hz
    • Analog voltage output
    • CT connection monitoring
    • PCB style device, very small footprint and lightweight

  • Applications: RCMB101

    • Grounded AC/DC systems
    • Level 2 electric vehicle chargers

  • Ordering information: RCMB101

    NameResponse ValueOrdering Number
    RCMB1010...20 mA B94042098

  • Downloads: RCMB101

    Document Name Document No. Date Download
    Technical Bulletin / Datasheet
    RCMB101    		 NAE1042580 11.2011
    Download

  • Accessories: RCMB101

  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories

  • RCMB-500 Series

    Integratable ground fault monitoring modules for converters and combiner boxes

    RCMB20-500 and RCMB35-500 series ground fault monitoring modules are designed for fault current monitoring in AC/DC systems. All monitoring electronics are built into the measuring current transformer, no external monitor is required. The small form-factor devices are designed for integration into equipment and panels on the line side, such as frequency converters, inverters, and combiner boxes. Push-wire terminal connectors and insulated wire ensure simple installation and integration.

    RCMB20-500 models feature a 0.78" (20 mm) opening, and RCMB35-500 models feature a 1.38" (35 mm) opening. Both models have a 4 - 20 mA output, proportional to the RMS value of the measured ground fault current from 0 to 500 mA.

  • Key Features: RCMB-500 Series

    • Integratable device for AC/DC fault current monitoring
    • RMS value measurement (AC + DC)
    • 0-500 Hz frequency range
    • Measuring electronics integrated into current transformer
    • 0.78" (20 mm) and 1.38" (35 mm) openings for system conductors
    • 500 mA measuring range
    • 24 VDC supply voltage
    • 4-20 mA analog output
    • CT connection monitoring utilizing cyclical test current
    • Multicolor LED for device status

  • Applications: RCMB-500 Series

    • AC/DC ground fault monitoring
    • Integration into frequency converters / inverters / VFDs
    • Integration into combiner boxes in PV systems

  • Ordering information: RCMB-500 Series

    NameResponse ValueInput currentDiameter of openingSupply VoltageOrdering Number
    RCMB20-500-010...500 mA 4... 20 mA0.75" (20 mm)DC 20.4...28.8 V B94042101
    RCMB35-500-010...500 mA 4... 20 mA1.35" (35 mm)DC 20.4...28.8 V B94042102

  • Downloads: RCMB-500 Series

    Document Name Document No. Date Download
    Technical Bulletin / Datasheet
    RCMB20-500 / RCMB35-500    		 NAE1042510 10.2012
    Download
    Installation Bulletin
    RCMB20-500 / RCMB35-500    		 NAE1048510 10.2012
    Download
    Brochure
    Overview - Protection Relays    		 NAE1001450 04.2013
    Download
    Brochure
    Ground Fault Protection in PV Systems    		 NAE1111040 08.2010
    Download

  • Accessories: RCMB-500 Series