Mersen R215709 - 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. Type aM NH fuse-links are partial-range breaking capacity fuse-links, used to protect motor circuits as they are strongly current-limiting and have low power losses. They interrupt currents from 6.3 times In up to their maximum breaking capacity and are therefore suited for short-circuit protection only. They must be associated with other switchgear for protection against overloads. These fuse-links can have a rated current equal to the motor's nominal current. NH3 fuse cover .
Mersen

R215709

Alternate Item Number: 8430399017037

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Overview

The Mersen NH3 NH fuse cover (SKU R215709) is a critical component of the NH plug-in fuse system, engineered for motor circuit protection in industrial applications. This partial-range breaking capacity fuse-link (type aM) is specifically designed for short-circuit protection in motor circuits, offering strong current-limiting capabilities and low power losses. The NH system includes a fuse-base (with optional terminal covers and phase barriers), a fuse-link with blade contact, and a fuse-link replacement device (LV HRC fuse puller). Key specifications include a rated current equal to the motor's nominal current, interrupting currents from 6.3 times In up to its maximum breaking capacity (80 kA at 690VAC for size NH3). The fuse-link is current-limiting, ensuring rapid response to fault conditions while minimizing energy let-through. Due to its design, non-interchangeability of rated current is not guaranteed, requiring installation by qualified professionals to ensure safety and compliance with IEC standards. The NH3 fuse cover is compatible with NH fuse-links in sizes 00 to 4, with dimensions tailored for size NH3 (33 mm width, 123 mm depth, 205 mm height). It supports screw or DIN rail mounting, providing flexibility for various industrial panel configurations. The fuse-link replacement device (LV HRC fuse puller) enables safe and efficient fuse-link replacement without exposure to live components. Ideal for protecting motors, transformers, and other inductive loads, the Mersen NH3 NH fuse cover delivers reliable short-circuit protection while maintaining low power dissipation (e.g., 12.7W at 160A, 690VAC). Trust Mersen's expertise in electrical protection for your critical industrial applications.
  • Partial-range breaking capacity fuse-link (type aM) for motor circuit protection
  • Interrupts currents from 6.3x In up to 80 kA breaking capacity at 690VAC
  • Low power losses (e.g., 12.7W at 160A, 690VAC) for energy efficiency
  • Compatible with NH fuse-links sizes 00 to 4; NH3 dimensions: 33x123x205 mm
  • Requires professional installation due to non-interchangeability of rated current

Specifications

Connection Type
Plug-in
Series
NH
Size
NH3
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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.
9F61 Size B Clips 1.6in

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9F61 Size B Clips 1.6in

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.