Mersen B1034518 - DIN NH Standard fuse-link gG Size NH4a 500VAC 250VDC 400A live tags Top indicator Body width 100.10 mm
Mersen

B1034518

Alternate Item Number: NH4AGG50V400-8


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Specification Sheet

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Overview

Mersen B1034518 is a DIN NH Standard fuse-link (gG type) designed for Size NH4a applications, delivering robust protection in industrial electrical systems. This high-breaking capacity fuse-link is rated for 500V AC and 250V DC, with a nominal current of 400A, making it ideal for heavy-duty industrial environments where reliable fault protection is critical. The fuse-link features live tags and a top indicator for clear status visibility, ensuring quick identification during maintenance or troubleshooting. With a body width of 100.10mm and a power dissipation of 32W at rated current, it efficiently handles high short-circuit currents while maintaining operational stability. The gG classification indicates full-range breaking capacity, allowing it to interrupt any current surge from the lowest fusing current up to its breaking capacity, providing standalone protection for cables and equipment. This fuse-link is part of the NH system, a plug-in fuse system composed of fuse-bases, fuse-links with blade contacts, and replacement devices (LV HRC fuse pullers). Designed for professional use, it protects electrical devices and industrial setups from electrodynamic effects of very high short-circuit currents. The non-interchangeability of rated current requires handling by qualified professionals to ensure proper system coordination and safety. Manufactured by Mersen in France, this fuse-link is a reliable choice for industrial power distribution, motor control centers, and other high-current applications where precision and durability are paramount.
  • Rated current: 400A for high-current industrial applications
  • Voltage ratings: 500V AC / 250V DC for versatile compatibility
  • Full-range breaking capacity (gG) interrupts all current surges up to rated limits
  • Live tags and top indicator for clear status visibility and maintenance
  • Body width: 100.10mm, power dissipation: 32W at rated current
  • Part of the NH plug-in fuse system for modular industrial protection
  • Manufactured by Mersen in France for high-quality industrial standards

Specifications

AC Voltage Rating
500 V
Amperage Rating
400 A
Application
gG: General purpose (protection of cables and LV-networks)
Body Material
Ceramic
Brand Name
Mersen
Connection
Plain Blades
Connection Material
Silver-Plated Copper
DC Voltage Rating
250 V
Interrupt Rating
120 kA
Mounting
Clip
Size
7.87 x 3.94 x 48.62 in
Size
200 x 100 x 1235 mm
Special Features
Dimensions in accordance with DIN 43 620 Live tags Top indicator 0 cadmium
Standard
IEC/EN 60269-1 and -2 VDE 0636 Part 201
Type
IEC NH Fuse-Links
Type Of Indicators
Top indicator
Package Dimensions (L x W x H)
7.87 in x 3.94 in x 48.62 in
Package Dimensions (L x W x H)
200 mm x 100 mm x 1235 mm
Package Weight (Imperial)
5.710 lb
Package Weight (Metric)
2.590 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.

LCC5

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.