Neutral Grounding Resistors


  • SE-330

  • The SE-330 is an advanced ground-fault and neutral-grounding resistor monitoring relay that is compl...More

  • Supply
    Voltage
    (VAC):
     28-52, 65-265

  • Supply
    Voltage
    (VDC):
     36-72, 85-275

  • Relay
    Contacts:
     One Form A One Form B Two Form C, Two Form A Two Form C

  • Find Littelfuse SE-330HV Products

    SE-330AU

  • The SE-330AU is an advanced earth-fault and earthing-resistor monitoring relay for low- and medium-v...More

  • Supply
    Voltage
    (VAC):
     28-52, 65-265

  • Supply
    Voltage
    (VDC):
     36-72, 85-275

  • Relay
    Contacts:
     One Form A One Form B Two Form C, Two Form A Two Form C

  • SE-330HV

  • The SE-330 is an advanced ground-fault and neutral-grounding-resistor monitoring relay. It measures ...More

  • Supply
    Voltage
    (VAC):
     28-52, 65-265

  • Supply
    Voltage
    (VDC):
     36-72, 85-275

  • Relay
    Contacts:
     One Form A One Form B Two Form C, Two Form A Two Form C

  • SE-325

  • The SE-325 Neutral-Grounding-Resistor Monitor is used on resistance-grounded systems up to 25 kV to ...More

  • Supply
    Voltage
    (VAC):
     120, 240

  • Supply
    Voltage
    (VDC):
     120

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

  • PGR-5330

  • The PGR-5330 is an advanced ground-fault and resistor monitoring relay. The PGR-5330 measures neutra...More

  • Supply
    Voltage
    (VAC):
     65 - 265

  • Supply
    Voltage
    (VDC):
     32 - 70, 80 - 265

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

Resistance Grounding eliminates transient overvoltages and single phase Arc-Flash hazards by reducing the ground-fault current to 5 A, as well as the ability to locate the ground fault. Per IEEE Standard 141-1993, Arc-flash hazards are eliminated if the ground-fault current is reduced to 5 A or less. For systems 2.4 kV and higher, low-resistance grounding systems can be used. Properly sized resistance grounding systems solve two problems of ungrounded systems—transient overvoltages and difficulty locating ground faults.

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pdf icon Monitoring Neutral Grounding Resistors

Resistance grounding prevents many of the problems that are associated with ungrounded and solidly grounded electrical distribution and utilization systems.