Ground Fault Relays


  • Littelfuse Protection Relays PGR-6101 Ground-Fault Insulation Monitor

    PGR-6101

  • Operates on one- or three-phase solidly grounded, resistance grounded and ungrounded systems up to 6...More

  • Supply
    Voltage
    (VAC):
     120 Vac

  • Supply
    Voltage
    (VDC):
     N/A

  • Relay
    Contacts:
     Two Form C (N.O./N.C.)

  • SE-601

  • Operates on DC ungrounded systems ranging from industrial 24- Vdc control circuits to 1000-Vdc solar...More

  • Supply
    Voltage
    (VAC):
     120 - 240

  • Supply
    Voltage
    (VDC):
     12-30, 40 - 55, 100 - 240

  • Relay
    Contacts:
     One Form A (N.O.); One Form B (N.C.)

  • EL731

  • Operates on AC resistance grounded systems and DC grounded systems. The EL731 is a microprocessor-ba...More

  • Supply
    Voltage
    (VAC):
     120/240, 24

  • Supply
    Voltage
    (VDC):
     120/240, 120/ 240, 48, 24

  • Relay
    Contacts:
     Three Form C (N.O./N.C.)

  • PGR-4300

  • Operates on solidly grounded AC systems. The PGR-4300 Generator Ground-Fault Relay provides a simple...More

  • Supply
    Voltage
    (VAC):
     120

  • Supply
    Voltage
    (VDC):
     12, , 24

  • Relay
    Contacts:
     One Form C (N.O./N.C.)

  • SE-502

  • The SE-502 Ground-Fault Ground-Continuity Detector provides Class-A GFCI trip level and trip times f...More

  • Supply
    Voltage
    (VAC):
     120

  • Supply
    Voltage
    (VDC):
     N/A

  • Relay
    Contacts:
     Three Form C (N.O./N.C.)

  • SE-701

  • Operates on AC solidly grounded and AC resistance grounded systems. The SE-701 is a microprocessor-...More

  • Supply
    Voltage
    (VAC):
     24, , 120/240

  • Supply
    Voltage
    (VDC):
     12-24, 48, 120/240

  • Relay
    Contacts:
     One Form A (N.O.); One Form B (N.C.)

  • SE-703

  • Operates on AC solidly grounded and AC resistance grounded systems. The SE-703 is a microprocessor-b...More

  • Supply
    Voltage
    (VAC):
     24, , 120/240

  • Supply
    Voltage
    (VDC):
     12-24, 48, 120/240

  • Relay
    Contacts:
     2 Form C, One Form A (N.O.); One Form B (N.C.)

  • SE-704

  • Operates on AC solidly grounded and AC resistance grounded systems. The SE-704 is a microprocessor-b...More

  • Supply
    Voltage
    (VAC):
     24, , 120/240

  • Supply
    Voltage
    (VDC):
     12-24, 48, 120/240

  • Relay
    Contacts:
     One Form A (N.O.); One Form B (N.C.)

  • PGR-4700

  • Operates on AC solidly grounded and AC resistance grounded systems. The PGR-4700 sensitive ground-fa...More

  • Supply
    Voltage
    (VAC):
     120, 24, 240

  • Supply
    Voltage
    (VDC):
     24

  • Relay
    Contacts:
     Two Form C (N.O./N.C.)

The primary purpose of grounding electrical systems is to provide protection against electrical faults. However, this was not common practice until the 1970’s. Until then, most commercial and industrial systems were ungrounded. Although ungrounded systems do not cause significant damage during the first ground fault, the numerous disadvantages associated with ground faults resulted in a change to the grounding philosophy. There are other advantages for a grounded system, such as reduction of shock hazards and protection against lightning. Electrical faults can be divided into two categories: phase-to-phase faults and ground faults. Studies have shown that 98% of all electrical faults are ground faults (Source: Woodham, Jack, P.E. “ The Basics of Grounding Systems”. While fuses can protect against phase-to-phase faults, additional protection, such as protection relays, are typically required to protect against ground faults.