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Low voltage NH knife-blade fuse links

Low voltage NH knife-blade fuse links

Product catalog summary

Overview

This document details the technical specifications, standards compliance, product range, and application notes for ETI's NV/NH low-voltage knife-blade fuse-links, including the new KOMBI series. These fuse-links are designed for protection of electrical installations, motors, transformers, and switchgear across various industrial and commercial settings.

1. Product Description and Advantages

ETI's new generation NV00C to NV3 fuse-links feature the KOMBI dual indication system, providing visible fuse operation status from the top and center.
Compatible with standard fuse bases, vertical fuse rails, and fuse-switch disconnectors.
Key advantages include:
- High breaking capacity of 120 kA.
- Rated voltages: 400 V, 500 V, 690 V, 1000 V AC, and up to 440 V DC (DC use requires consultation).
- Two cover types: aluminum (allows removal under voltage) and plastic (with insulated metal removal tag).
- Certified by VDE and supported by CCA/CB test reports.

2. Standards and Compliance

Dimensions conform to DIN 43620.
Technical standards met include:
- IEC 60269-1:2005 / EN 60269-1:1998+A1:2005
- IEC 60269-2 series and EN equivalents
- VDE 0636-2011 for 690 V aM and 400 V gTr
- PN-IEC 60269-2 for 400 V gF

3. Construction Details

Fuse body made from high-quality steatite, resistant to temperature overloads.
Copper melting element spot-welded to a shaped contact knife for precise positioning.
Ceramic body filled with chemically structured quartz sand of precise granulation.
Contact knives coated with silver or optionally nickel for enhanced durability.
Fusing characteristics stable within ±10% current tolerance, verified by cyclic testing.

4. Product Range and Technical Data

Extensive product codes cover fuse-links from NV00C to NV4a, including KOMBI and insulated versions.
Rated currents range from 2 A up to 1600 A, with breaking capacities up to 120 kA.
Weights vary from approximately 135 g (smallest sizes) to over 2800 g (largest sizes).
Packaging quantities range from 1 to 120 pieces depending on product type.

5. Fuse-link Types and Characteristics

gG Fuse-links: General purpose protection for cables and lines, rated up to 690 V and 1250 A, available in sizes NV00 to NV4a, including KOMBI and striker pin versions.
aM Fuse-links: Designed for motor drives and switchgear protection where gG is insufficient, allowing full starting currents and preventing damage during short circuits, rated up to 690 V.
gF Fuse-links: For low voltage installations with low short-circuit currents, available in NV00C to NV1 sizes, rated up to 400 V.
gTr Fuse-links: Transformer protection for rated powers 50–1000 kVA at 400 V, available in NV2 to NV4a sizes.

6. Rated Currents, Voltages, and Breaking Capacities

Rated currents: 2 A to 1250 A for gG types; other types vary accordingly.
Voltages: 400 V, 500 V, 690 V, and 1000 V depending on fuse type.
Breaking capacity typically 100 kA, with KOMBI series rated up to 120 kA.

7. Application Notes and Recommendations

aM fuse-links recommended for motor drive protection where gG is inadequate.
gF fuse-links suitable for installations with low short-circuit currents, providing selective protection.
gTr fuse-links specialized for transformer protection matching transformer power ratings.
Striker pin versions provide enhanced safety by visibly indicating fuse operation.
Insulated versions available for improved safety.
DC applications require consultation with ETI technical support.

8. Summary Table Highlights

Fuse-link Type	Rated Current (A)	Rated Voltage (V)	Breaking Capacity (kA)	Typical Sizes	Special Versions
gG	2 - 1250	400, 500, 690, 1000	100	NV00 to NV4a	Striker pin, KOMBI
aM	Standard NV sizes	Up to 690	100	NV00 to NV4a	KOMBI versions
gF	NV00C to NV1	Up to 400	Not specified	NV00C to NV1	None specified
gTr	Rated transformer power 50 - 1000 kVA	400	100	NV2 to NV4a	None specified

Conclusion

The ETI NV/NH KOMBI fuse-links offer a robust, certified, and versatile solution for low-voltage circuit protection. Their high breaking capacity, clear operation indication, and broad product range make them suitable for diverse electrical protection needs in industrial and commercial applications.

Catalog excerpts

Lowvoltage NH knife-blade fuse-links Low voltage NH knife-blade fuse-links ETI is introducing a new generation of low-voltage fuse-links from size NVOOC up to to NV3 with new, dual indication of fuse-link operation, called KOMBI. The indicator is easily visible on the top and centre of the fuse-link, whether it is situated in a standard fuse base or vertical fuse rail or in fuse-switch disconnector. The most important advantages of NV/NH KOMBI fuse-links: ■ High breaking capacity, 120 kA ■ Rated voltages: 400 V a.c, 500 V a.c, 690 V a.c. and 1000 V a.c and up to 440 V d.c. In case of use in d.c. voltages, consultation with ETI technical team is recommended. ■ Two versions of covers: aluminium, when the removal tag is under voltage and plastic, when insulated metal removal tag is incorporated into the plastic cover ■ VDE certificates and CCA/CB test reports General about NV/NH fuse-links Their dimensions correspond with DIN 43620, other technical characteristics correspond with the requirements of the following standards: ■ Rated voltage 400V/gF: PN-IEC 60269-2 Short description of constituent parts for NV fuse-links The body of the fuse-link is made of quality steatite which is highly resistant against temperature overloads. In the inner part of the steatite body there is a copper melting element which is welded on a specially shaped inner part of the contact knife by spot welding. By careful shaping of this part we achived that during assembly the melting element is placed exactly into the middle of the inner place. The remaining inside place of the ceramic body is filled up with precisely determined granulation and chemical structure quarz sand. All contact knives are additionally protected with a layer of silver or on special order of nickel. On the base of cyclic tests we have proved that the fusing characteristics are very stable and the tolerance on the current axis can be up to ± 10%. Rated current Breaking capacity Rated voltage

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Low voltage NH knife-blade fuse-links NV/NH 00 C gG with striker pin technical data on page 410

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Lowvoltage NH knife-blade fuse-links NV/NH 1 gG with striker pin technical data on page 410

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Low voltage NH knife-blade fuse-links NV/NH 2 gG with striker pin technical data on page 410

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Lowvoltage NH knife-blade fuse-links technical data on page 410

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Low voltage NH knife-blade fuse-links NV/NH 4a gG with striker pin NV/NH IIOOOV technical data on page 410

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Lowvoltage NH knife-blade fuse-links Fuse-link NV/NHaM Rated current Breaking capacity Rated voltage Fuse-links with aM characteristics are intended for protection of switchgears and controlgears as well as motors in motor drives where gG characteristics do not comply with all requirements of succesful protection of these devices. They are made in all standard NV sizes from 00 to 4a for all standard rated currents and for voltages to 690 V. Their main duty is to enable a full usage of switchgears and controlgears in the region of starting currents and to prevent sparking or descruction of protective...

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Low voltage NH knife-blade fuse-links Rated current Breaking capacity Rated voltage Fuse-links with gF current characteristics are intendend for protection of low voltage installations and energy lines, where expected short circuit currents are low. We offer all standard rated currents in sizes NVOOC, NVOO, NV1C and NV1 Rated transformer power Breaking capacity Rated voltage gGtalilne gGtalilne vlozke vlozke technical data on page 414

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Low voltage NH knife-blade fuse links-14

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