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Ground Fault Products for Grounded and HRG Systems

Service Entrance Ground Fault Relays

  • Description
  • Features
  • Applications
  • Ordering Info
  • Downloads
  • Accessories
  • CMGF420

    Digital service entrance ground fault relay

    The CMGF420 is a control-powered, UL 1053 listed service entrance relay for use in grounded systems. When combined with an N/O shunt trip breaker, it provides ground fault detection and interruption at the mains entrance of an electrical system. When a fault is detected, the output contacts will cause the connected shunt trip breaker to trip and interrupt power to the system.

    The relay supports a pickup range of up to 1200 A when using a compatible current transformer. The CMGF420 supports current transformers with a 600:1 (60 - 1200 A trip range) or 1000:1 ratio (100 - 1200 A trip range).

    After entering the proper current transformer ratio into the settings of the device, the value shown on the LCD screen will be the value read on the primary side of the current transformer.

  • Key Features: CMGF420

    • UL 1053 listed service entrance relay
    • Satisifies requirements of NEC Article 230.95 and CSA C22.1 Section 14-102 when paired with appropriate equipment
    • Small form factor, easily integratable into switchgear
    • 60 - 1200 A adjustable trip level range
    • Supports 600:1 or 1000:1 current transformers
    • Digital display with real-time readout
    • Real-time readout displays measured current on primary side of current transformer
    • Simple connection to N/O shunt trip breaker
    • Supports DIN rail mounting, screw mounting, or front panel mounting with optional mounting kit
    • Password protection
    • RoHS compliance
  • Applications: CMGF420

    • Service entrance ground fault protection
    • General industrial use
  • Ordering information: CMGF420

    NameResponse ValueSupply VoltageOrdering Number
    CMGF420-D-260 - 1200 A AC 100 - 240 V (42 - 460 Hz) DC 100 - 240 V B93060015
  • Downloads: CMGF420

    Document Name Language Date Download
    Technical Bulletin / Datasheet
    English 04.2016
    User Manual
    English 04.2016
    Overview of Products
    English 06.2017
  • Accessories: CMGF420