Mersen C213994 - The NH system is classified among plug-in fuse systems and is composed of: • fuse-base, (possibly including terminal covers and phase barriers) • fuse-link with blade contact • fuse-link replacement device (LV HRC fuse puller) Since the design of this system cannot guarantee non-interchangeability of rated current, it must be handled by a qualified professional. NH-fuse links „gTr“ are used for the protection of transformers. The time/current characteristic is especially adapted to that of the protected transformer and implies optimal selectivity to NH-fuse links characteristic gG. The fuses can be loaded with 1×3 times nominal current for up to 10 hours. The fuse link operates at 1×5 times nominal transformer current within 2 hours. 500 Volts 1250 amps gG NH4 series.
Mersen

C213994

Alternate Item Number: 4086500032204

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Overview

The Mersen NH4 gG 500V 1250A NH fuse link (SKU: C213994) is a high-rupturing capacity (HRC) fuse designed for transformer protection within the IEC NH low-voltage fuse system. This fuse link is rated for 500V AC and 1250A nominal current, making it suitable for industrial and utility applications requiring reliable overcurrent protection. The NH4 series fuse link features a blade contact design for plug-in installation into NH fuse bases, ensuring quick replacement and maintenance without system shutdown. Engineered for transformer protection, the gG characteristic provides optimal selectivity with gG-rated fuses, adapting to the time/current characteristics of transformers. The fuse can handle 1×3 times nominal current for up to 10 hours and operates at 1×5 times nominal transformer current within 2 hours, ensuring precise fault response. The NH system includes a fuse-base (with optional terminal covers and phase barriers), fuse-link with blade contact, and a replacement device (LV HRC fuse puller) for safe handling. Compliance with IEC 60269-1, IEC 60269-2, and other international standards ensures reliability in high-fault environments up to 1250A. The NH4 size fuse link is part of Mersen’s NH low-voltage fuse system, a globally recognized standard for industrial protection. Ideal for transformer primary protection, motor circuits, and distribution systems, this fuse link delivers consistent performance in demanding electrical environments. Note: Installation and replacement must be performed by qualified professionals due to the non-interchangeability design of rated currents in the NH system.
  • 500V AC voltage rating, 1250A nominal current
  • gG time/current characteristic optimized for transformer protection
  • Handles 1×3 times nominal current for up to 10 hours
  • Operates at 1×5 times nominal current within 2 hours
  • Plug-in NH4 size with blade contact for NH system compatibility
  • IEC 60269-1/2 compliant for industrial reliability
  • Part of Mersen NH low-voltage fuse system (SKU: C213994)

Specifications

Amperage Rating
1250 A
Application
gG: General purpose (protection of cables and LV-networks)
Brand Name
Ferraz Shawmut
Connection
Blade
Connection Type
Blade Contact
Current Rating
1250 A
Interrupt Rating
120 kA
Mounting
Clip
Mounting Type
Plug-in
Series
NH
Size
NH4
Special Features
Maximum transformer capacity (up to 1·3 x lrat) 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 cut off capacity Easy selection between transformer and fuse link
Standard
IEC/EN 60269-1 and -2 VDE 0636 Part 201
Type
IEC NH Fuse-Links
Voltage Rating
500 VAC
Voltage Rating
500 V V
Package Dimensions (L x W x H)
9.06 IN x 6.3 IN x 4.33 IN
Package Dimensions (L x W x H)
23.0124 cm x 16.002 cm x 10.9982 cm
Package Weight (Imperial)
5.040 L
Package Weight (Metric)
2.286 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.