NGRUS Series - Neutral Grounding Resistor System

Series: NGRUS
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High-resistance grounding prevents many of the problems that are associated with ungrounded and solidly grounded electrical distribution and utilization systems. High-resistance grounding can limit point-of-fault damage, eliminate transient overvoltages, reduce the arc-flash hazards, limit voltage exposure to personnel, and provide adequate tripping levels for selective current-based ground-fault detection and coordination. The Littelfuse Neutral Grounding Resistor System is a neutral grounding resistor (NGR), current transformer, and sensing resistor installed in a NEMA 3R enclosure used to high-resistance ground transformers and generators. The NGR system is designed for use with Littelfuse Neutral Grounding Resistor Monitors for complete system grounding and grounding protection. The NGR series – US systems are designed for use in US applications and all other parts of the world, not including Canada. For applications in Canada, please use the NGR series – Canada.

Access specifications, certifications, check availability and order parts below

Catalog #CT secondary current AmpsInput
Voltage (V)
Mounting MethodWeight (lbs/g)built in CTsFrequencyInput Current Range (A)Input Impedance (Ohms)NEMA RatingResponse Time (ms)Sense Resistance (Ohms)StockCompare
NGRUS3140.05480Floor MountNo6021383RContinuousER-600VCCheck
NGRUS3150.05480Floor MountNo6021383R; Weather Protected Sensing ResistorContinuousER-600VCCheck
NGRUS3160.05480Floor Mount0 KgNo60555.43RContinuousER-600VCCheck
NGRUS3170.05480Floor MountNo60555.43R; Weather Protected Sensing ResistorContinuousER-600VCCheck
NGRUS3180.05600Floor MountNo602173.53RContinuousER-600VCCheck
NGRUS3190.05600Floor MountNo602173.53R; Weather Protected Sensing ResistorContinuousER-600VCCheck
NGRUS3200.05600Floor MountNo60569.43RContinuousER-600VCCheck
NGRUS3210.05600Floor MountNo60569.43R; Weather Protected Sensing ResistorContinuousER-600VCCheck
NGRUS3220.054160Floor MountNo605480.93R10 sER-5KVCheck
NGRUS3230.054160Floor MountNo605480.93R; Weather Protected Sensing Resistor10 sER-5WPCheck
NGRUS3240.054160Floor MountNo605480.93RContinuousER-5KVCheck
NGRUS3250.054160Floor Mount0 KgNo605480.93R; Weather Protected Sensing ResistorContinuousER-5WPCheck
NGRUS3260.054160Floor MountNo6010240.53R10 sER-5KVCheck
NGRUS3270.054160Floor MountNo6010240.53R; Weather Protected Sensing Resistor10 sER-5WPCheck
NGRUS3280.054160Floor MountNo6010240.53RContinuousER-5KVCheck
NGRUS3290.054160Floor MountNo6010240.53R; Weather Protected Sensing ResistorContinuousER-5WPCheck
NGRUS3300.054160Floor MountNo6015160.33R10 sER-5KVCheck
NGRUS3310.054160Floor MountNo6015160.33R; Weather Protected Sensing Resistor10 sER-5WPCheck
NGRUS3320.054160Floor MountNo6015160.33RContinuousER-5KVCheck
NGRUS3330.054160Floor MountNo6015160.33R; Weather Protected Sensing ResistorContinuousER-5WPCheck
NGRUS33414160Floor MountNo602596.23R10 sER-5KVCheck
NGRUS33514160Floor MountNo602596.23R; Weather Protected Sensing Resistor10 sER-5WPCheck
NGRUS33614160Floor MountNo602596.23RContinuousER-5KVCheck
NGRUS33714160Floor MountNo602596.23R; Weather Protected Sensing ResistorContinuousER-5WPCheck

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