SE-107 Series

Ground-Fault Ground-Check Monitor

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The SE-105/SE-107 is a combination ground-wire monitor and ground-fault relay for resistance-grounded systems. It continuously monitors the integrity of the ground conductor to protect portable equipment from hazardous voltages caused by ground faults. The SE-105/SE-107 is an excellent choice for trailing cables 5 kV and under in underground mining applications. For higher voltages or long-cable applications, see the SE-134C/SE-135.

Features & Benefits

  • Adjustable pickup (0.5, 2.0, 4.0 A)

    Unit can be used on a wide variety of trailing cable applications

  • Adjustable time delay (0.1-2.0 s)

    Adjustable trip delay for quick protection and system coordination

  • Harmonic filter

    Prevents false operation

  • Zener-characteristic termination assembly

    Provides reliable ground-check loop verification

  • Fail-safe ground-check circuit

    Ensures ground-check circuit remains safe even in the event of equipment failure

  • Conformal coating

    Additional coating protects circuit boards against harsh environment

  • SE-105: Selectable UV- or shunt-trip mode

    Provides flexibility for different applications

  • SE-107: UV-trip mode only

    Eliminates chance of unauthorized change to trip circuit

SE-105 SE-107 Datasheet

SE-107 Manual


  • IEEE Device Numbers: Checking or Interlocking Relay (3GC), Ground Fault (50G/N, 51G/N)
  • Input Voltage: See ordering information
  • Dimensions: H 150 mm (5.9”); W 109 mm (4.3”); D 100 mm (4.0”)
  • Trip Level Settings: 0.5, 2.0, 4.0 A
  • Trip Time Settings: 0.1-1.0 s
  • Contact Operating Mode: Selectable fail-safe or non-fail-safe (SE-105) Fail-safe only (SE-107)
  • Harmonic Filtering: Standard feature
  • Reset Button: Local and remote
  • Output Contacts: Isolated Form A
  • Approvals: CSA certified, UL Listed (E340889), C-Tick (Australian)
  • Conformally Coated: Standard feature
  • Warranty: 5 years
  • Mounting: Surface

Ordering Information

SE-105120 VAC
SE-105D120 VAC/VDC
SE-105E240 VAC
SE-107120 VAC
SE-107D120 VAC/VDC
SE-107E240 VAC


CT200 SeriesRequired
SE-TA6, SE-TA6-SMOptional
SE-TA6A SeriesOptional
RK-102, RK-105, RK-105IOptional



CT200 Series Current Transformer
Required CT detects ground-fault current.

1N5339B Termination Device
5 W axial-lead ground-check termination; included with SE-105/SE-107.

SE-TA6 Termination Assembly
Optional termination assembly with convenient terminals and mounting holes

SE-TA6-SM Stud-Mount Termination Assembly
Optional 50 W ground-check termination that is robust and compact for submersible pumps. Wire lead simplifies installation.