NGR Series - US

Series: NGR
Neutral Grounding Resistor
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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 #ApprovalsCT-Secondary Rating (A)Input
Voltage (V)
Mounting MethodWeight (lbs/g)Compare
NGRUS314CSA or UL0.05480Floor Mount23 kg (50-57 lbs)
NGRUS315CSA or UL0.05480Floor Mount23 kg (50-57 lbs)
NGRUS316CSA or UL0.05480Floor Mount23 kg (50-57 lbs)
NGRUS317CSA or UL0.05480Floor Mount23 kg (50-57 lbs)
NGRUS318CSA or UL0.05600Floor Mount23 kg (50-57 lbs)
NGRUS319CSA or UL0.05600Floor Mount23 kg (50-57 lbs)
NGRUS320CSA or UL0.05600Floor Mount23 kg (50-57 lbs)
NGRUS321CSA or UL0.05600Floor Mount23 kg (50-57 lbs)
NGRUS322CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS323CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS324CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS325CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS326CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS327CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS328CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS329CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS330CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS331CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS332CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS333CSA or UL0.054160Floor Mount(400-550lbs)
NGRUS334CSA or UL14160Floor Mount(400-550lbs)
NGRUS335CSA or UL14160Floor Mount(400-550lbs)
NGRUS336CSA or UL14160Floor Mount(400-550lbs)
NGRUS337CSA or UL14160Floor Mount(400-550lbs)

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