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Ground Fault Products for Ungrounded Systems

Main AC/DC Systems

BENDER ground detectors are specifically designed to detect ground faults on ungrounded systems, giving advanced warning of issues before leakage current may even be present. BENDER monitors employ the latest technology to ensure accurate readings on virtually all types of systems, including AC, DC, and mixed AC/DC systems, as well as systems with variable frequency drives (VFDs).

Main system detectors are designed for general AC/DC power distribution monitoring, as well as specific applications. Where applicable, these monitors meet the requirements for ground detectors set forth in NEC 250.21(B) and CEC 10-106(2). Certain devices may have industry standard specific approvals - see individual device information for details.

  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • IR470LY

    Ground fault detector for ungrounded (floating) AC systems

    This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded systems.

    The IR470LY monitors for ground faults in ungrounded (floating) single-phase and three-phase AC systems by monitoring the system's insulation resistance. The device works on systems up to 793 VAC. Optional voltage coupler accessories extend this range up to 7200 VAC.

    Settings for the IR470LY are modified via the onboard DIP switches and potentiometers. The IR470LY utilizes an external supply voltage for power, which allows deenergized systems to also be monitored.

  • Key Features: IR470LY

    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
    • Ground fault detection for ungrounded AC systems (0...793 VAC)
    • Optional voltage coupler extends range to 7200 VAC
    • Adjustable insulation response value, 1 kΩ...200 kΩ
    • LED bar graph displaying currently read insulation resistance
    • DIP switches and potentiometers for settings
    • Built-in test and reset buttons
    • Connections for external test and reset
    • Latching or non-latching operation, selectable
    • One DPDT contact output, normally energized or normally de-energized operation
  • Applications: IR470LY

    • AC systems, single- and three-phase
    • General distribution and control systems
    • Motors and motor control centers
    • Generators, portable and fixed
    • Large industrial systems
  • Ordering information: IR470LY

    NameResponse ValueSupply VoltageOrdering Number
    IR470LY-401 - 200 kΩ AC 230 V (50 - 460 Hz) B91048007
    IR470LY-40111 - 200 kΩ AC 24 V (50 - 460 Hz) B91048012
    IR470LY-40121 - 200 kΩ AC 42 V (50 - 460 Hz) B91048002
    IR470LY-40131 - 200 kΩ AC 90 - 132 V (50 - 460 Hz) B91048011
    IR470LY-40151 - 200 kΩ AC 400 V (50 - 460 Hz) B91048008
    IR470LY-40161 - 200 kΩ AC 500 V (50 - 460 Hz) B91048018
    IR470LY-40171 - 200 kΩ AC 690 V (50 - 460 Hz) B91048017
    IR470LY-40181 - 200 kΩ AC 440 V (50 - 460 Hz) B91048024
    IR470LY-40211 - 200 kΩ DC 9.6 - 84 V B91048006
    IR470LY-40231 - 200 kΩ DC 77 - 286 V B91048026
  • Downloads: IR470LY

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    IR470LY
    English 04.2011
    Download
    Installation Bulletin
    IR470LY
    English 10.2012
    Download
    Brochure
    Overview of Products
    English 02.2014
    Download
  • Accessories: IR470LY

    Voltage Couplers

    Voltage coupler for ungrounded AC systems up to 7200 V

    NameOrdering Number
    AGH520SB913033
  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • iso685

    Digital ground fault detector for ungrounded AC/DC systems

    This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded AC systems, as well as the 2014 requirement of NEC 250.167(A) for ungrounded DC systems.

    The iso685 is the newest generation of ground fault monitoring for ungrounded AC/DC systems. Encompassing Bender's extensive expertise in ungrounded systems into one device, the iso685 works on virtually all types of systems, with simple installation and preset settings features.

    The iso685 connects to systems up to 690 VAC / 1000 VDC, and is compatible with systems with variable frequency drives (VFD / ASD). Optional voltage couplers extend this voltage range. During initial setup, the iso685 features predefined profiles that tailors the device's settings to your application. The onboard isoGraph feature allows for trending the system's insulation resistance over time - no software required.

    A variety of alarm outputs are available, including dry contacts, analog outputs, audible buzzer, and remote communication options.

  • Key Features: iso685

    • A single solution for monitoring for ground faults in virtually all types of ungrounded systems up to 690 VAC / 1000 VDC (voltage couplers extend this range)
    • Detects ground faults by monitoring the system's insulation resistance, with two separately adjustable alarm values (1 kΩ - 10 MΩ)
    • Works on pure AC, pure DC, and mixed AC/DC systems, including systems with variable frequency drives (VFDs)
    • Incorporates multiple measurement methods to ensure optimal measurement technique for system type
    • Digital display showing readings in real-time
    • Easy-to-use, onboard menu for managing settings
    • Predefined measurement profiles to simplify setup process by system type / application
    • Advanced trending of system isolation via onboard time-based graphing
    • A variety of alarm outputs, including 2 SPDT contacts, analog outputs, and advanced communication options
    • Automatic self-test
    • History memory storing up to 1000 events
    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
  • Applications: iso685

    • AC systems, single- and three-phase
    • Pure DC and mixed AC/DC systems
    • General distribution and control systems requiring fast ground fault location
    • UPS systems and battery systems
    • Systems with variable frequency drives (VFDs)
    • Systems with power conversion components, including rectifiers and inverters
    • Large industrial systems
  • Ordering information: iso685

    NameResponse ValueSupply VoltageOrdering Number
    iso685-D1 - 10000 kΩ AC 100 - 240 V (47 - 460 Hz) DC 24 V B91067010
  • Downloads: iso685

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    iso685
    English 10.2014
    Download
    Installation Bulletin
    iso685
    English 10.2014
    Download
    Brochure
    Overview of Products
    English 02.2014
    Download
  • Accessories: iso685

    Voltage Couplers

    Voltage coupler for ungrounded DC systems up to 1760 V

    NameOrdering Number
    AGH150W-4B98018006
    AGH520SB913033
    AGH676S-4B913055
  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • IRDH275

    Digital ground fault detector for ungrounded AC/DC systems

    This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded AC systems, as well as the new 2014 requirement of NEC 250.167(A) for ungrounded DC systems.

    The IRDH275 monitors for ground faults in ungrounded single-phase AC, three-phase AC, and DC systems by monitoring the system's insulation resistance. It may be connected to systems of up to 793 VAC / 650 VDC. Voltage coupler accessories extend this range. The AMP Plus measuring principle utilized by the IRDH275 meets the requirements of modern power systems, including pure DC systems, systems with rectifiers, and systems with variable frequency drives (VFDs). In systems with high leakage capacitances, the IRDH275 automatically adapts itself to ensure an accurate reading.

    The IRDH275 features a digital display showing the system's insulation resistance'in real-time. All settings are changed via the device's built-in menu. The IRDH275 utilizes an external supply voltage for power, which allows deenergized systems to also be monitored.

    The IRDH275 is a DIN rail mounted type device. For the panel mounted version, please refer to the IRDH375.

  • Key Features: IRDH275

    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
    • Ground fault detection for ungrounded AC/DC systems (0...793 VAC, 0...650 VDC)
    • Optional voltage coupler extends range to 7200 VAC / 1760 VDC
    • Two separately adjustable insulation resistance response values, 1 kΩ...10 MΩ
    • Works on pure AC, pure DC, and mixed AC/DC systems, including systems with variable frequency drives (VFDs)
    • Digital display showing readings in real-time
    • Easy-to-use, onboard menu for managing settings
    • Automatic self-test
    • Analog output
    • Built-in test and reset buttons
    • Connections for external test and reset
    • Latching or non-latching operation, selectable
    • Two SPDT contact outputs, normally energized or normally de-energized operation
    • History memory storing up to 300 events ("B" version)
  • Applications: IRDH275

    • AC systems, single- and three-phase
    • Pure DC and mixed AC/DC systems
    • General distribution and control systems requiring fast ground fault location
    • UPS systems and battery systems
    • Systems with variable frequency drives (VFDs)
    • Systems with power conversion components, including rectifiers and inverters
    • Large industrial systems
  • Ordering information: IRDH275

    NameResponse ValueEnhanced temperature and vibration protectionHistory memory for up to 300 recordsCommunication capability0(4) - 20 mA analog outputSupply VoltageOrdering Number
    IRDH275-4351 - 10000 kΩ AC 88 - 264 V (20 - 460 Hz) DC 77 - 286 V B91065100
    IRDH275-4271 - 10000 kΩ DC 19.2 - 72 V B91065104
    IRDH275-4251 - 10000 kΩ DC 10 - 30 V B91065108
    IRDH275B-4351 - 10000 kΩ AC 88 - 264 V (20 - 460 Hz) DC 77 - 286 V B91065101
    IRDH275B-4271 - 10000 kΩ DC 19.2 - 72 V B91065105
    IRDH275B-4251 - 10000 kΩ DC 10 - 30 V B91065109
    IRDH275BW-4351 - 10000 kΩ AC 88 - 264 V (20 - 460 Hz) DC 77 - 286 V B91065101W
    IRDH275BW-4271 - 10000 kΩ DC 19.2 - 72 V B91065105W
    IRDH275BW-4251 - 10000 kΩ DC 10 - 30 V B91065109W
  • Downloads: IRDH275

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    IRDH275
    English 08.2013
    Download
    Installation Bulletin
    IRDH275
    English 08.2013
    Download
    User Manual
    IRDH275
    English 05.2011
    Download
    Brochure
    Overview of Products
    English 02.2014
    Download
  • Accessories: IRDH275

    Remote Communication Systems

    Ethernet and Modbus/TCP communication gateway for BENDER devices

    NameOrdering Number
    COM460IPB95061010
    COM461MTB95061021
    COM462RTUB95061022
    Voltage Couplers

    Voltage coupler for ungrounded DC systems up to 1760 V

    NameOrdering Number
    AGH150W-4B98018006
    AGH520SB913033
    AGH676S-4B913055
    External Meters

    Analog output meters for BENDER devices

    NameOrdering Number
    7204-1421B986763
    9604-1421B986764
  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • isoLR275

    Digital ground fault detector for ungrounded, low-resistance systems

    This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded AC systems, as well as the upcoming 2014 requirement of NEC 250.167(A) for ungrounded DC systems.

    The isoLR275 detects ground faults in ungrounded, low resistance systems up to 793 VAC / 1100 VDC. The iso-PV monitors for ground faults by measuring the system's insulation resistance, providing early indication of ground faults before leakage current may even be present. Both AC and DC ground faults can be detected, including on systems that have high leakage capacitances.

    The isoLR275 is specifically designed for ungrounded systems which run at a low resistance to ground. Included are two components, the ground detector and the high voltage coupler. Both are required for operation (the voltage coupler may be installed in a separate cabinet to keep high voltage connections separate).

    The isoLR275 features a digital display which shows the system's insulation resistance in real-time. Two SPDT contacts are available. The isoLR275 utilizes an external supply voltage for power.

  • Key Features: isoLR275

    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
    • Early indication of both AC and DC ground faults
    • Connects to systems up to 793 VAC / 1100 VDC
    • Designed specifically for systems operating with a low resistance to ground
    • Separate voltage coupler gives the flexibility of a separate high voltage cabinet
    • Two separately adjustable insulation resistance response values, 200 Ω...100 kΩ
    • Works on systems with up to 500 μF
    • Digital display showing readings in real-time
    • Easy-to-use, onboard menu for managing settings
    • Automatic self-test
    • Analog output
    • Built-in test and reset buttons
    • Connections for external test and reset
    • Latching or non-latching operation, selectable
    • Two SPDT contact outputs, normally energized or normally de-energized operation
    • History memory storing up to 300 events
    • Compatibility with BENDER's remote communication system
    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
  • Applications: isoLR275

    • AC systems, single- and three-phase
    • Pure DC and mixed AC/DC systems
    • Systems operating with a low resistance to ground
    • General distribution and control systems requiring fast ground fault location
    • UPS systems and battery systems
    • Systems with variable frequency drives (VFDs)
    • Large furnaces / smelters
    • Systems with power conversion components, including rectifiers and inverters
    • Large industrial systems
  • Ordering information: isoLR275

    NameResponse ValueSupply VoltageOrdering Number
    isoLR275-335 and AGH-LR-30.2 - 100 kΩ AC 88 - 264 V (42 - 460 Hz) DC 77 - 286 V B91065703W
    isoLR275-327 and AGH-LR-30.2 - 100 kΩ DC 19.2 - 72 V B91065702W
  • Downloads: isoLR275

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    isoLR275
    English 12.2011
    Download
    Installation Bulletin
    isoLR275
    English 12.2011
    Download
    User Manual
    isoLR275
    English 06.2012
    Download
    Brochure
    Overview of Products
    English 02.2014
    Download
  • Accessories: isoLR275

  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • IRDH375

    Digital ground fault detector for ungrounded AC/DC systems

    This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded AC systems, as well as the new 2014 requirement of NEC 250.167(A) for ungrounded DC systems.

    The IRDH375 monitors for ground faults in ungrounded single-phase AC, three-phase AC, and DC systems by monitoring the system's insulation resistance. It may be connected to systems of AC 0...793 V and DC 0...650 V. Optional voltage coupler accessories extend this range. The AMP Plus measuring principle utilized by the IRDH375 meets the requirements of modern power systems, including pure DC systems, systems with rectifiers, and systems with variable frequency drives (VFDs). In systems with high leakage capacitances, the IRDH375 automatically adapts itself to ensure a reliable reading.

    The IRDH375 features a digital display showing the system's insulation resistance in real-time. All settings are changed via the device's built-in menu. The IRDH375 utilizes an external supply voltage for power, which allows deenergized systems to also be monitored.

    The IRDH375 is a panel mounted type device. For the DIN rail mounted version, please refer to the IRDH275.

  • Key Features: IRDH375

    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
    • Ground fault detection for ungrounded AC/DC systems (0...793 VAC, 0...650 VDC)
    • Optional voltage coupler extends range to 7200 VAC / 1760 VDC
    • Two separately adjustable insulation resistance response values, 1 kΩ...10 MΩ
    • Works on pure AC, pure DC, and mixed AC/DC systems, including systems with variable frequency drives (VFDs)
    • Digital display showing readings in real-time
    • Easy-to-use, onboard menu for managing settings
    • Automatic self-test
    • Analog output
    • Built-in test and reset buttons
    • Connections for external test and reset
    • Latching or non-latching operation, selectable
    • Two SPDT contact outputs, normally energized or normally de-energized operation
    • History memory storing up to 300 events ("B" version)
  • Applications: IRDH375

    • AC systems, single- and three-phase
    • Pure DC and mixed AC/DC systems
    • UPS systems and battery systems
    • Systems with variable frequency drives (VFDs)
    • Systems with power conversion components, including rectifiers and inverters
    • Large industrial systems
  • Ordering information: IRDH375

    NameResponse ValueEnhanced temperature and vibration protectionHistory memory for up to 300 recordsCommunication capability0(4) - 20 mA analog outputSupply VoltageOrdering Number
    IRDH375-4351 - 10000 kΩ AC 88 - 264 V (20 - 460 Hz) DC 77 - 286 V B91065000
    IRDH375-4271 - 10000 kΩ DC 19.2 - 72 V B91065002
    IRDH375-4251 - 10000 kΩ DC 10 - 30 V B91065001
    IRDH375B-4351 - 10000 kΩ AC 88 - 264 V (20 - 460 Hz) DC 77 - 286 V B91065004
    IRDH375B-4271 - 10000 kΩ DC 19.2 - 72 V B91065006
    IRDH375B-4251 - 10000 kΩ DC 10 - 30 V B91065005
    IRDH375BW-4351 - 10000 kΩ AC 88 - 264 V (20 - 460 Hz) DC 77 - 286 V B91065004W
    IRDH375BW-4271 - 10000 kΩ DC 19.2 - 72 V B91065006W
    IRDH375BW-4251 - 10000 kΩ DC 10 - 30 V B91065005W
  • Downloads: IRDH375

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    IRDH375
    English 08.2013
    Download
    Installation Bulletin
    IRDH375
    English 08.2013
    Download
    User Manual
    IRDH375
    English 05.2011
    Download
    Brochure
    Overview of Products
    English 02.2014
    Download
  • Accessories: IRDH375

    Remote Communication Systems

    Ethernet and Modbus/TCP communication gateway for BENDER devices

    NameOrdering Number
    COM460IPB95061010
    COM461MTB95061021
    COM462RTUB95061022
    Voltage Couplers

    Voltage coupler for ungrounded DC systems up to 1760 V

    NameOrdering Number
    AGH150W-4B98018006
    AGH520SB913033
    AGH676S-4B913055
  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • IRDH575

    Digital ground fault detector and ground fault location controller for ungrounded AC/DC systems

    This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded AC systems, as well as the new 2014 requirement of NEC 250.167(A) for ungrounded DC systems.

    The IRDH575 monitors for ground faults in ungrounded single-phase AC, three-phase AC, and DC systems by monitoring the system's insulation resistance. The AMP Plus measuring principle meets the requirements of modern power systems, including pure DC systems, systems with rectifiers, and systems with variable frequency drives (VFDs). Additionally, the IRDH575 works in combination with EDS series devices to create a ground fault location system for ungrounded circuits.

  • Key Features: IRDH575

    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
    • Ground fault detection for ungrounded AC/DC systems
    • Ground fault location in ungrounded AC/DC systems with EDS series location device
    • Two separately adjustable insulation resistance response values, 1 kΩ...10 MΩ
    • Works on pure AC, pure DC, and mixed AC/DC systems, including systems with variable frequency drives (VFDs)
    • Digital display showing readings in real-time
    • Easy-to-use, onboard menu for managing settings
    • Simple, automatic ground fault location with EDS device via RS-485
    • Automatic self-test
    • Analog output
    • Built-in test and reset buttons
    • Connections for external test and reset
    • Latching or non-latching operation, selectable
    • Two SPDT contact outputs, normally energized or normally de-energized operation
    • History memory storing up to 300 events
  • Applications: IRDH575

    • AC systems, single- and three-phase
    • Pure DC and mixed AC/DC systems
    • UPS systems and battery systems
    • Systems with variable frequency drives (VFDs)
    • Systems with power conversion components, including rectifiers and inverters
    • Large industrial systems
    • Ungrounded systems with high leakage capacitances
    • Interconnected ungrounded systems
  • Ordering information: IRDH575

    NameResponse ValueSystem VoltageEnhanced temperature and vibration protectionHistory memory for up to 300 recordsCommunication capability0(4) - 20 mA analog outputSupply VoltageOrdering Number
    IRDH575B1-4351 - 10000 kΩ AC 20 - 575 V (50 - 460 Hz) DC 20 - 575 V AC 340 - 760 V (50 - 460 Hz) DC 340 - 575 V AC 88 - 264 V (40 - 460 Hz) DC 77 - 286 V B91065500
    IRDH575B1-4271 - 10000 kΩ AC 20 - 575 V (50 - 460 Hz) DC 20 - 575 V AC 340 - 760 V (50 - 460 Hz) DC 340 - 575 V DC 19.2 - 72 V B91065502
  • Downloads: IRDH575

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    IRDH575
    English 03.2011
    Download
    Installation Bulletin
    IRDH575
    English 10.2011
    Download
    User Manual
    IRDH575
    English 08.2011
    Download
    Brochure
    Overview of Products
    English 02.2014
    Download
  • Accessories: IRDH575

    Ground Fault Location Modules

    Ground fault location module for ungrounded AC/DC systems

    NameOrdering Number
    EDS460-D-1B91080001
    EDS460-D-2B91080002
    EDS460-L-1B91080003
    EDS460-L-2B91080004
    EDS490-D-1B91080009
    EDS490-D-2B91080010
    EDS490-L-1B91080011
    EDS490-L-2B91080012
    EDS461-D-1B91080005
    EDS461-D-2B91080006
    EDS461-L-1B91080007
    EDS461-L-2B91080008
    EDS491-D-1B91080013
    EDS491-D-2B91080014
    EDS491-L-1B91080015
    EDS490-L-2B91080016
    Remote Communication Systems

    Ethernet and Modbus/TCP communication gateway for BENDER devices

    NameOrdering Number
    COM460IPB95061010
    COM461MTB95061021
    COM462RTUB95061022