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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | Startco / Littelfuse |
| Manufacturer Product Number | NGRUS330 |
| Description | Neutral Grounding Resistor; 15 A; 10 s |
| Datasheet | Download Datasheet |
The Littelfuse Startco NGRUS330 is a neutral grounding resistor system for 4160 V line-to-line, 2400 V line-to-neutral systems, limiting ground-fault current to 15 A (10 s rating).
A neutral grounding resistor holds the current of a line-to-ground fault to a safe, known value, so a resistance-grounded system can keep running on the first fault while the monitor finds it.
Supplied as: Neutral Grounding Resistor System (NGR, current transformer and sensing resistor in a NEMA 3R enclosure). Resistance: 160.3 Ω (+/- 10 % resistance). Monitor: SE-330. Current transformer: SE-CS10-2.5. Sensing resistor: ER-5KV.
Enclosure: NEMA 3R, galvanized steel, NEMA 3R. Finish: powder coated. Insulation level: 75 KV BIL. Temperature rise: 760 °C (1400 °F). Seismic bracing: included. Size: Drawing (in): front view 36; right side view 36; height 30; top view 38 x 38; bottom (4) 5/8 dia. mtg. holes on 25 1/4 x 33; (3) 1 1/2 conduit K.O..
Approvals: cULus or CSA at customer request.
| Category | |
| Manufacturer | Startco / Littelfuse |
| Model | NGRUS |
| Product Type | Neutral Grounding Resistor System (NGR, current transformer and sensing resistor in a NEMA 3R enclosure) |
| System Voltage | 4160 V line-to-line, 2400 V line-to-neutral |
| Let-Through Current | 15 A |
| Resistance | 160.3 Ω |
| Time Rating | 10 s |
| Tolerance | +/- 10 % resistance |
| Current Transformer | SE-CS10-2.5 |
| Sensing Resistor | ER-5KV |
| Monitor | SE-330 |
| Enclosure Style | NEMA 3R, galvanized steel |
| Enclosure Rating | NEMA 3R |
| Finish | Powder coated |
| Insulation Level | 75 KV BIL |
| Temperature Rise | 760 °C (1400 °F) |
| Seismic Bracing | Included |
| Altitude | 0-1000 masl |
| Dimensions | Drawing (in): front view 36; right side view 36; height 30; top view 38 x 38; bottom (4) 5/8 dia. mtg. holes on 25 1/4 x 33; (3) 1 1/2 conduit K.O. |
| Approvals | cULus or CSA at customer request |