Mersen J1030523 - DIN NH Standard fuse-link gTr Size NH4a 400VAC 909A 630KVA live tags Center indicator Body width 98 mm
Mersen

J1030523

Alternate Item Number: NH4A2GTR630KVA


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Specification Sheet

Contact for Pricing

Overview

The Mersen J1030523 DIN NH Standard fuse-link gTr (Size NH4a) is a high-rupture-capacity (HRC) fuse designed for transformer protection in low-voltage electrical systems. Rated for 400VAC, this fuse-link handles up to 909A with a transformer capacity of 630KVA, making it ideal for industrial and commercial applications where reliable overcurrent protection is critical. The fuse-link features live gripping-lugs and a center indicator for clear status visibility, ensuring safe and efficient operation. Key specifications include a body width of 98mm, power dissipation of 53W at rated current, and compliance with IEC standards for NH fuse systems. The gTr time/current characteristic is specifically optimized for transformer protection, providing superior selectivity compared to standard gG fuses. This fuse can be continuously loaded at 1.3 times its nominal current for up to 10 hours and operates within 2 hours at 1.5 times the nominal transformer current, ensuring robust performance under overload conditions. Designed for use with NH fuse-bases (including terminal covers and phase barriers), the J1030523 integrates seamlessly into existing NH systems. The fuse-link replacement device (LV HRC fuse puller) is recommended for safe handling. Due to the system's design, non-interchangeability of rated currents must be managed by qualified professionals. This fuse-link is manufactured by Mersen in France, a leader in electrical protection solutions, and is distributed globally for industrial applications.
  • Rated for 400VAC, 909A, 630KVA transformer protection
  • gTr time/current characteristic optimized for transformer overloads
  • Live gripping-lugs and center indicator for clear status visibility
  • Body width: 98mm, power dissipation: 53W at rated current
  • Compliant with IEC NH fuse system standards

Specifications

AC Voltage Rating
400 V
Amperage Rating
909 A
Application
Protection of transformers
Body Material
Ceramic
Brand Name
Mersen
Connection
Plain Blades
Connection Material
Silver-Plated Copper
Connection Type
Blade Contact
Current Rating
909 A
Interrupt Rating
100 kA
Mounting
Clip
Mounting Type
Plug-in
Series
NH
Size
7.87 x 3.86 x 4.8 in
Size
200 x 98 x 122 mm
Size
NH4a
Special Features
Maximum transformer capacity (up to 1,3 x In) Reduction of unnecessary interruption of operation Precise cut off of overload Characteristic adapted to the transformer Resistant to ageing Selectivity to fuse links gG High current limiting High breaking capacity Easy selection between transformer and fuse link
Standard
VDE 0636 Part 201 IEC 60269-1 and -2
Type
IEC NH Fuse-Links
Type Of Indicators
Center indicator
Voltage Rating
400 VAC
Package Dimensions (L x W x H)
7.87 in x 3.86 in x 4.8 in
Package Dimensions (L x W x H)
200 mm x 98 mm x 122 mm
Package Weight (Imperial)
4.850 lb
Package Weight (Metric)
2.200 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

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Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.