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  • IR425

    Digital ground fault detector for ungrounded single-phase AC and DC systems up to 300 V

    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 IR425 monitors for ground faults in ungrounded single-phase AC and DC systems up to 300 V by measuring the system's insulation resistance. A response value may be set in the range of 1 kΩ to 200 kΩ. The IR425 also works on pure DC systems, and systems utilizing variable frequency drives (VFDs). The digital display shows the read insulation resistance in real time. All settings are also changed from the digital display. Two separate SPDT contact outputs may be set to normally energized or normally deenergized operation.

    The IR420-D4 utilizes an external supply voltage for power, which allows deenergized systems to also be monitored.

  • Key Features: IR425

    • 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 up to 300 V
    • Two separately adjustable insulation resistance response values, 1 kΩ...200 kΩ
    • 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
  • Applications: IR425

    • Single-phase AC/DC systems up to 300 V
    • Systems with variable frequency drives (VFDs)
    • Control circuits
    • Portable generators
    • General low-voltage, ungrounded circuits
    • Large industrial systems
  • Ordering information: IR425

    NameResponse ValueSupply VoltageOrdering Number
    IR425-D4-11 - 200 kΩ AC 16 - 72 V (42 - 460 Hz) DC 9.6 - 94 V B91036403
    IR425-D4-21 - 200 kΩ AC 70 - 300 V (42 - 460 Hz) DC 70 - 300 V B91036402
  • Downloads: IR425

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    English 04.2011
    Installation Bulletin
    English 05.2012
    User Manual
    English 07.2013
    User Manual
    Spanish 07.2013
    Overview of Products
    English 06.2017
    3D STEP Drawing
    420 Series (Standard)
    N/A 06.2013
  • Accessories: IR425