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MERSEN FUSE NH4AC 250KVA 400V GTR TI J1028729

MERSEN FUSE NH4AC 250KVA 400V GTR TI J1028729

Mersen NH4AGTR250KVA-8 NH4a gTr transformer protection fuse-link rated 400 V AC and 361 A with top indicator and live gripping lugs for 250 kVA transformer protection.

SKU: NH4AGTR250KVA-8Alt SKU: NH4AGTR250KVA-8MPN: J1028729
Price
List Price £306.32 ex VAT
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£306.32
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Manufacturer Lead Time

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Why Choose the Mersen NH4AGTR250KVA-8 NH Fuse-Link?

The Mersen NH4AGTR250KVA-8 is a high-performance DIN NH gTr fuse-link engineered specifically for transformer protection in low voltage power distribution systems. Manufactured by Mersen, this NH4a size fuse-link provides dependable protection for distribution transformers by offering a time/current characteristic optimised for transformer inrush currents while maintaining excellent fault protection.

Designed for use on 400 V AC systems, the NH4AGTR250KVA-8 features a top indicator and live gripping lugs, allowing quick identification of operated fuse-links and safe replacement by qualified personnel. Its robust construction delivers consistent performance in demanding industrial and commercial electrical installations.

With a 361 A rated current and suitability for protecting 250 kVA transformers, this Mersen NH fuse-link is an excellent choice for switchboards, transformer feeders, industrial facilities and electrical infrastructure where reliable transformer protection is essential.

Key Advantages

  • Designed specifically for 250 kVA transformer protection.
  • NH4a DIN fuse-link manufactured to IEC standards.
  • 400 V AC operation for low voltage distribution systems.
  • Top indicator provides rapid visual indication after operation.
  • Live gripping lugs assist with safe fuse handling using an approved fuse puller.
  • Excellent selectivity with downstream protection devices.
  • Reliable protection against overloads and short circuits.

Key Features

  • Mersen NH gTr transformer protection fuse-link.
  • Catalogue number: NH4AGTR250KVA-8.
  • Size: NH4a.
  • Operating voltage: 400 V AC.
  • Rated current: 361 A.
  • Transformer rating: 250 kVA.
  • Operating class: gTr.
  • Top visual indicator.
  • Live gripping lugs.
  • Fully compliant with IEC NH fuse system requirements.

Reliable Transformer Protection

Mersen gTr NH fuse-links are developed specifically for transformer protection, providing a time/current characteristic that accommodates transformer energisation while delivering dependable protection against overload and short-circuit faults. This helps minimise nuisance operation while safeguarding valuable electrical equipment.

The NH4AGTR250KVA-8 is suitable for industrial switchgear, transformer feeders, electrical distribution panels and utility applications where reliable low voltage transformer protection is required.

Typical Applications

  • Distribution transformer protection.
  • Industrial switchboards.
  • Electrical distribution panels.
  • Commercial power installations.
  • Manufacturing facilities.
  • Infrastructure and utility electrical systems.

Technical Specifications

Voltage 400 V
Manufacturer Mersen
Series NH gTr Fuse-Links
Model NH4AGTR250KVA-8
Product type NH transformer protection fuse-link
Fuse size NH4a
Utilisation category gTr
Rated current 361 A
Rated voltage 400 V AC
Transformer nominal capacity 250 kVA
Indicator Top indicator
Gripping lugs Live gripping lugs
Body width Approximately 72.9 mm
Power dissipation 28 W
Weight Approximately 2.2 kg
Compliance RoHS compliant
HS Code 85361090
Country of Manufacture Hungary
Device Type Fuse link
Fuse Type NH (DIN)
Fuse Size NH4a
Fuse Class gTr
Current 361 A

Frequently Asked Questions

What is the Mersen NH4AGTR250KVA-8 used for?

It is a DIN NH gTr fuse-link designed specifically to protect 250 kVA transformers in 400 V AC electrical distribution systems.

What is the rated current of this fuse-link?

The NH4AGTR250KVA-8 has a rated current of 361 A.

What does the gTr operating class mean?

The gTr characteristic is designed for transformer protection, allowing transformer magnetising inrush currents while providing full-range overload and short-circuit protection.

What is the purpose of the top indicator?

The integrated top indicator provides a clear visual indication when the fuse has operated, making maintenance quicker and easier.

Where is this fuse-link typically installed?

It is commonly installed in NH fuse bases within switchboards, transformer feeders and low voltage distribution equipment by qualified electrical professionals.

Trusted by Electrical Professionals Worldwide

Mersen NH transformer protection fuse-links are trusted by panel builders, OEMs, utilities and industrial maintenance engineers for dependable transformer protection, high reliability and compliance with international electrical standards.

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