Mersen NRN40 - Fuse NRN - Class H 250VAC 40A Ferrule
Mersen

NRN40

Alternate Item Number: NRN40

UPC: 068938830175


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Overview

The Mersen NRN40 is a Class H, non-time delay fuse designed for reliable circuit protection. This specific unit features a 40 Amp current rating and operates at a maximum voltage of 250 VAC. Its ferrule connection type ensures secure and straightforward installation within compatible fuse holders. The NRN series, including the NRN40, offers a standard 10kA short circuit rating, providing essential protection against overcurrents and short circuits in various industrial and commercial applications. For 250 Volt applications ranging from 15 to 60 amps, Mersen NRN fuses are certified as Type "P" fuses, meeting the requirements of the Canadian Electrical Code for low melting-point, non-time delay fuses. This certification is crucial for ensuring compliance and safety in Canadian installations. While the NRN series provides a 10kA interrupting rating, it's worth noting that other Mersen fuse options, such as the OTN series (found in the OT/OTS catalog section), offer higher interrupting ratings (50kA) and are Class K-5 fuses, catering to applications with greater fault current potential. The NRN40, with its specific ratings and certifications, is a dependable choice for standard protection needs where its 10kA rating is sufficient.
  • Mersen NRN Series Fuse
  • Class H, Non-Time Delay
  • 40 Amp Current Rating
  • 250 VAC Voltage Rating
  • Ferrule Connection Type

Specifications

AC Voltage Rating
250 V
Amperage Rating
40 A
Application
General-Purpose Circuits Lighting Circuits Resistive Loads Small Appliance Circuits Control Panels (Legacy) Light-Duty Distribution Equipment
Body Material
Paper
Brand Name
Mersen
Class
Class H
Connection
Ferrule
Connection Material
Copper
Fuse Class
Class H
Interrupt Rating
10 kA
Mounting
Clip
Size
3 x 0.81 in
Size
76.2 x 20.574 mm
Special Features
Non-time delay 250V and 600V applications
Standard
Type "P" (15 - 60A)
Type
HRC Fuses
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
3 in x 0.81 in x 0.81 in
Package Dimensions (L x W x H)
76.2 mm x 20.574 mm x 20.574 mm
Package Weight (Imperial)
0.090 lb
Package Weight (Metric)
0.041 kg
Fuse NRS - Class H 600VAC 1A Ferrule

NRS1

Fuse NRS - Class H 600VAC 1A Ferrule
Fuse NRS - Class H 600VAC 20A Ferrule

NRS20

Fuse NRS - Class H 600VAC 20A Ferrule
Fuse NRS - Class H 600VAC 100A Blade

NRS100

Fuse NRS - Class H 600VAC 100A Blade
Fuse NRS - Class H 600VAC 200A Blade

NRS200

Fuse NRS - Class H 600VAC 200A Blade

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.