Call Us Today
01706 242050
Trade Portal
MERSEN FUSE NH4A 500KVA 400V GTR TI NH42GTR500KVA-8

MERSEN FUSE NH4A 500KVA 400V GTR TI NH42GTR500KVA-8

Mersen NH42GTR500KVA-8 DIN NH4a gTr fuse link with 722 A current rating and 400 V AC voltage for reliable 500 kVA distribution transformer protection.

SKU: NH42GTR500KVA-8Alt SKU: NH42GTR500KVA-8MPN: V1030487
Price
List Price £198.52 ex VAT
Your Price (ex VAT)
£198.52
Manufacturer Lead Time Please contact us for a delivery time before you order
Get the best trade prices Trade exclusive

Create a trade account to unlock exclusive pricing, special offers and more.

Sign up for a trade account Quick & easy setup
SUBTOTAL (EX VAT) £198.52
Trade pricing is personalised to your account

Manufacturer Lead Time

£198.52

Why Choose the Mersen NH42GTR500KVA-8 NH Fuse Link?

The Mersen NH42GTR500KVA-8 is a robust DIN NH gTr fuse link engineered to provide dependable protection for low voltage distribution transformers in demanding industrial and commercial power systems. Manufactured by Mersen, this NH4a fuse is specifically designed to accommodate transformer energisation currents while delivering reliable overload and short circuit protection.

As part of the proven Mersen NH gTr fuse series, this fuse incorporates a top operating indicator and live gripping lugs, allowing maintenance personnel to quickly identify blown fuses and safely replace them. Its high breaking capacity and transformer-specific operating characteristic make it ideal for protecting valuable electrical assets.

With a 722 A current rating, 400 V AC operating voltage and suitability for 500 kVA transformers, the NH42GTR500KVA-8 is an excellent choice for industrial switchgear, substations and power distribution equipment requiring reliable transformer protection.

Key Advantages

  • Designed specifically for distribution transformer protection.
  • 722 A rated current suitable for 500 kVA transformer installations.
  • 400 V AC rated voltage for low voltage distribution systems.
  • NH4a DIN standard fuse for industrial applications.
  • Integrated top blown-fuse indicator.
  • Live gripping lugs enable safer fuse handling.
  • Excellent current limiting and high breaking capacity.
  • Reliable protection against overloads and short circuits.

Key Features

  • Mersen NH gTr transformer protection fuse.
  • 722 A current rating.
  • 400 V AC rated voltage.
  • Suitable for 500 kVA transformers.
  • DIN NH4a fuse size.
  • Top operating indicator.
  • Live gripping lugs.
  • High breaking capacity.
  • Designed for industrial power distribution.

Reliable Protection for Distribution Transformers

The Mersen NH gTr fuse range has been developed specifically for transformer protection applications. Its carefully optimised time-current characteristic allows transformer magnetising inrush currents without nuisance operation while still providing rapid fault clearance during overload and short circuit conditions.

Designed for industrial facilities, utilities and commercial electrical installations, the NH42GTR500KVA-8 helps improve system reliability, reduce downtime and protect valuable transformer assets throughout their operational life.

Typical Applications

  • Distribution transformer protection.
  • Industrial switchboards.
  • Commercial electrical distribution.
  • Utility substations.
  • Power distribution equipment.
  • OEM electrical panels.

Technical Specifications

Current 722 A
Voltage 400 V
Manufacturer Mersen
Series NH gTr Fuse Links
Model NH42GTR500KVA-8
Product type DIN NH transformer protection fuse link
Fuse characteristic gTr
Fuse size NH4a
Rated current 722 A
Rated voltage 400 V AC
Transformer capacity 500 kVA
Indicator Top indicator
Contact type Live gripping lugs
Body width 98 mm
Weight Approx. 2.2 kg
Mounting NH fuse base
HS Code 85361090
Country of Manufacture Hungary
Device Type Fuse link
Fuse Type NH (DIN)
Fuse Size NH4a
Fuse Class gTr

Frequently Asked Questions

What is the Mersen NH42GTR500KVA-8 used for?

This fuse link is specifically designed to protect low voltage distribution transformers against overload and short circuit faults.

What transformer size is this fuse suitable for?

The NH42GTR500KVA-8 is designed for protecting transformers with a nominal capacity of approximately 500 kVA.

What voltage is this fuse rated for?

This fuse has a rated operating voltage of 400 V AC.

What does the gTr characteristic provide?

The gTr characteristic is specifically engineered for transformer protection, allowing transformer inrush currents while providing dependable 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, helping maintenance personnel identify and replace blown fuses quickly.

Trusted for Industrial Transformer Protection

Mersen NH gTr fuse links are trusted worldwide by electrical engineers, panel builders and utility operators for dependable transformer protection, high fault interruption capability and long-term reliability in demanding power distribution systems.

● Service Agreements

Credit Accounts

Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.

 Priority sourcing and supply support

 Flexible payment terms for qualifying organisations

 Support for engineering, maintenance, and operations

500 +

Stock lines ready to ship

1,000 +

Same day dispatches

3500 +

Customers supported

28 

Trusted Manfacturers

● frequently asked questions

Common questions about our products and support

 

At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.

What product ranges do you supply

We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products. 

Can you help specify the correct part?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

Do you have stock for urgent orders?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What are your delivery times and costs?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What about warranties, returns and faulty items?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

● latest blog

Discover  our latest insights and
expert advice

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

by | Aug 11, 2026 |

LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.

LED Controls: Danfoss Drives Authorised Partner

LED Controls: Danfoss Drives Authorised Partner

by | Jan 17, 2026 |

2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...

LED Controls: Your Complete Control Panel Solution

LED Controls: Your Complete Control Panel Solution

by | Jan 17, 2026 |

2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...