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MERSEN FUSE NH4AC 125KVA 400V GTR TI NH4AGTR125KVA-8

MERSEN FUSE NH4AC 125KVA 400V GTR TI NH4AGTR125KVA-8

Mersen NH4AGTR125KVA-8 NH4a gTr transformer fuse-link rated 180 A, 400 V AC for protection of 125 kVA low-voltage transformers.

SKU: NH4AGTR125KVA-8Alt SKU: NH4AGTR125KVA-8MPN: F1028726
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List Price £306.32 ex VAT
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Why Choose the Mersen NH4AGTR125KVA-8 Transformer Fuse-Link?

The Mersen NH4AGTR125KVA-8 is a specialist NH4a size gTr transformer fuse-link engineered to provide dependable protection for 125 kVA low-voltage transformers. Rated at 180 A and 400 V AC, it is specifically designed for transformer circuits where conventional general-purpose fuse-links are not suitable.

Its gTr operating characteristic has been developed to match the electrical and thermal characteristics of distribution transformers. This allows the fuse-link to withstand transformer magnetising inrush currents and temporary overload conditions while providing reliable protection against sustained overloads and short-circuit faults. The characteristic also offers excellent selectivity when coordinated with downstream NH gG fuse-links.

Manufactured to the DIN NH standard, the NH4AGTR125KVA-8 features a robust ceramic body, silver-plated copper blade contacts, live gripping lugs and a top-mounted indicator for quick identification of fuse operation. Its NH4a construction allows installation in compatible NH fuse bases and fuse-switch disconnectors used throughout industrial power distribution systems.

Key Advantages

  • Purpose-designed for 125 kVA transformer protection.
  • 180 A rated current for correctly coordinated transformer circuits.
  • 400 V AC operating voltage for industrial distribution systems.
  • gTr characteristic withstands transformer energisation and temporary overloads.
  • Provides excellent selectivity with downstream NH gG fuse-links.
  • Top indicator enables rapid fuse status identification.
  • Live gripping lugs support safe handling using approved NH fuse pullers.

Key Features

  • Mersen NH gTr transformer fuse-link series.
  • NH4a fuse size.
  • 125 kVA transformer rating.
  • 180 A rated current.
  • 400 V AC rated voltage.
  • gTr transformer protection characteristic.
  • 100 kA AC breaking capacity.
  • Top-mounted operation indicator.
  • Live gripping lugs.
  • Silver-plated copper blade contacts.
  • High-strength ceramic body.

Optimised Protection for Distribution Transformers

Unlike standard general-purpose fuse-links, the Mersen NH4AGTR125KVA-8 is specifically engineered for transformer protection. Its time-current characteristic follows the thermal behaviour of distribution transformers, allowing it to tolerate normal energisation currents without nuisance operation while still providing dependable fault protection.

When correctly coordinated, gTr fuse-links provide excellent selectivity with downstream protective devices, helping isolate transformer faults while maintaining continuity of supply to healthy circuits. Installation should always be carried out by qualified electrical professionals using compatible NH4a equipment.

Typical Applications

  • Low-voltage distribution transformers.
  • Industrial power distribution systems.
  • Transformer secondary protection.
  • Factory switchboards.
  • Commercial electrical distribution.
  • NH fuse-switch disconnectors and transformer panels.

Technical Specifications

Voltage 400 V
Phase Three Phase
Manufacturer Mersen
Series NH gTr Transformer Fuse-Links
Model NH4AGTR125KVA-8
Manufacturer part number F1028726
Product type NH transformer fuse-link
Fuse size NH4a
Utilisation category gTr
Transformer rating 125 kVA
Rated current 180 A
Rated voltage 400 V AC
Current type AC
Breaking capacity 100 kA AC
Indication system Top indicator
Connection type Plain blade contacts
Terminal material Silver-plated copper
Body material Ceramic
Body width 72.9 mm
Power dissipation 15 W
Product weight approx. 2.2 kg
EAN 3605340534948
RoHS compliant Yes
HS Code 85361090
Country of Manufacture Hungary
Device Type Fuse link
Fuse Type NH (DIN)
Fuse Size NH4a
Fuse Class gTr
Current 180 A

Frequently Asked Questions

What is the Mersen NH4AGTR125KVA-8 used for?

It is designed specifically to protect 125 kVA low-voltage transformers against overload and short-circuit faults.

What are the current and voltage ratings?

The fuse-link is rated at 180 A with a rated operating voltage of 400 V AC.

What does the gTr characteristic mean?

The gTr characteristic is specifically developed for transformer protection, allowing normal transformer energisation and temporary overloads while providing dependable fault protection.

What is the breaking capacity?

The NH4AGTR125KVA-8 has a maximum AC breaking capacity of 100 kA.

Which fuse holder is compatible?

This fuse-link is designed for compatible NH4a fuse bases and fuse-switch disconnectors. Installation should only be carried out by qualified electrical personnel.

Trusted Transformer Protection

Mersen gTr transformer fuse-links are trusted worldwide by panel builders, electrical contractors and power distribution specialists for dependable low-voltage transformer protection and excellent coordination with downstream protective devices.

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