NH (LV) — low-voltage high breaking capacity fuses NH000–NH4a
Country: Germany · Model: NH000–NH4a (gG, gTr, aM, gB)
NH000–NH4a blade fuses with a breaking capacity of up to 120 kA protect cable lines, motor circuits and transformers in LV networks. The rated voltage of the range is AC 400–1500 V, and the categories include gG, gTr, aM and gB. The fuse links are installed in switchboards, cable cabinets and transformer substations on the LV side.
- Sizes
- NH000, NH00, NH1, NH2, NH3, NH4a
- Rated voltage
- AC 400–1500 V (example: NH2 gG AC 500 V)
- Breaking capacity
- up to 120 kA
- Categories
- gG, gTr, aM, gB
Technical specifications
| Sizes | NH000, NH00, NH1, NH2, NH3, NH4a |
|---|---|
| Rated voltage | AC 400–1500 V (example: NH2 gG AC 500 V) |
| Breaking capacity | up to 120 kA |
| Categories | gG, gTr, aM, gB |
| Indication | combined indicator (front and central) |
| Series example | 2055213: NH2 gG AC 500 V, 35–250 A |
| Standards | IEC 60269-1/-2, VDE 0636 parts 1, 2, 21; VDE 0670-402 |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The fuse links are made in all standard sizes from NH000 to NH4a, and they have blade contacts. The current is limited already in the first half-cycle, and in the improved design the switching voltage is low, so power losses are minimal. The body is mechanically strong and the materials are corrosion-resistant. The combined operation indicator is visible both at the front and in the centre. The 2055213 series has size NH2, category gG, voltage AC 500 V and ratings of 35, 50, 63, 80, 100, 125, 160, 200, 224 and 250 A. The selectivity principle is simple. In case of a fault only the fuse link closest to the short-circuit location operates, and this can also be achieved in combination with circuit breakers when the characteristics are matched precisely. For transformers, selectivity between high-voltage and low-voltage fuse links is regulated by VDE 0670 part 402 (concepts A, B, C). The fuse links comply with IEC 60269-1/-2 and VDE 0636 parts 1, 2 and 21.
How to choose
The category is selected by the application. gG is full-range general-purpose protection, gTr is intended for transformers, aM protects motor circuits in a partial range, and gB is developed for the mining industry. The size depends on the current, and the NH000–NH4a range covers the path from compact fuse links to powerful incomers. For selectivity concepts with the high-voltage side, VDE 0670-402 distinguishes variants A, B and C, for example HH + NH gTr or HH + NH gG. Bases, barriers and handles for these fuse links are made by the NH-U range, and for semiconductors you need ULTRA rapid fast-acting fuses.
Request a price and lead time
NH (LV) — low-voltage high breaking capacity fuses NH000–NH4a. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is the breaking capacity of NH000–NH4a fuses?
Up to 120 kA. The fuse links limit the short-circuit current already in the first half-cycle, so the cable and equipment behind them do not experience the full peak current.
How do the categories gG, gTr, aM and gB differ?
gG protects in the full general-purpose range, gTr is intended for transformers, aM protects motor circuits in a partial range, gB is developed for the mining industry.
What rated currents does the 2055213 series have?
It is NH2 of category gG at AC 500 V with ratings of 35, 50, 63, 80, 100, 125, 160, 200, 224 and 250 A and a combined indicator.
How is selectivity of LV fuse links with circuit breakers ensured?
It can be obtained with precise matching of the characteristics. Only the device closest to the short-circuit location operates, and for transformers VDE 0670 part 402 applies.
What voltages are NH fuse links made for?
The rated voltages of the range are AC 400–1500 V. For example, NH2 gG is rated for AC 500 V.
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