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Protective Relays

Offline Fault Monitoring

BENDER offline ground detectors are designed for monitoring systems or loads while they are offline. These monitors may be employed on ungrounded systems or loads that are de-energized or disconnected from the main distribution. Additionally, they may be utilized for monitoring loads on grounded and high-resistance grounded systems that have been disconnected from the main system.

  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • IR420-D6

    Digital offline ground fault monitor for grounded and ungrounded systems

    The IR420-D6 monitors for ground faults on offline loads and circuits on grounded or ungrounded AC systems. The IR420-D6 monitors the system‘s insulation resistance to detect if any faults are present on the offline load. A digital display shows the insulation resistance reading in real-time. Two SPDT contact outputs are available for remote alarm indication.

    An external supply voltage is required to power the device. See ordering information for available supply voltages. High system voltages require the use of the AGH520S voltage coupler.

  • Key Features: IR420-D6

    • Ground fault monitoring for offline grounded and ungrounded systems
    • Two separately adjustable insulation resistance response values
    • Digital display showing readings in real-time
    • Easy-to-use, onboard menu for managing settings
    • Built-in test and reset button
    • Connections for external test and reset
    • Latching or non-latching operation, selectable
    • Two SPDT contact outputs, normally energized or normally de-energized operation
    • Meets requirements for ground detectors in accordance with NEC 250.21(B) and CEC 10-106(2)
  • Applications: IR420-D6

    • Single-phase or three-phase, offline AC systems
    • Offline motors and pumps
    • General loads with extended periods of offline time
  • Ordering information: IR420-D6

    NameResponse ValueSupply VoltageOrdering Number
    IR420-D6-110 - 20000 kΩ AC 16 - 72 V (42 - 460 Hz) DC 9.6 - 94 V B91016415
    IR420-D6-210 - 20000 kΩ AC 70 - 300 V (42 - 460 Hz) DC 70 - 300 V B91016407
  • Downloads: IR420-D6

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    English 01.2012
    Overview of Products
    English 06.2017
  • Accessories: IR420-D6

    Voltage Couplers

    Voltage coupler for ungrounded AC systems up to 7200 V

    NameOrdering Number