Mersen MF90A-4 - Battery Module Fuse 100VDC Max - 90A with Bolted Minimum breaking capacity: 320A Max. Rated Breaking Capacity DC: 20 kA @ 100 V L/R ≤ 1.5 ms
Mersen

MF90A-4

Alternate Item Number: MF90A-4

UPC: 782001482084


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Overview

The Mersen MF90A-4 Battery Module Fuse (SKU: MF90A-4) is a high-performance DC over-current protection device engineered for Battery Electrical Storage Systems (BESS), electric vehicles (EV/HEV), and supercapacitor modules. This bolted fuse delivers reliable clearing of DC fault currents up to 100VDC with a rated current of 90A and an interrupting rating of 20kA at L/R ≤1.5ms, ensuring optimal coordination with upstream protection systems. Designed for DC applications, the MF90A-4 features ultra-compact dimensions, low watt losses (2.7W at 0.5In), and high cycling performance for repeated fault clearing without degradation. Its minimum breaking capacity (MBC) of 320A ensures rapid response to low-level faults, while the maximum clearing time of 10 seconds at MBC provides controlled interruption to prevent thermal stress. The fuse meets JASO D622 standards for power cycling and vibrations, and is undergoing IATF-ISO/TS 16949 quality certification. Key specifications include a rated voltage of 100VDC, current rating of 90A, power dissipation of 2.7W at 0.5In, and a package weight of 28g. The bolted connection design simplifies installation in battery modules and stationary DC systems, offering full coverage for voltage and current ranges critical to modern energy storage applications. With UL recognition and compatibility across Mersen’s DC protection portfolio, the MF90A-4 is a trusted solution for protecting battery modules during shipping, handling, and system integration. Ideal for OEMs and system integrators in EV/HEV, electrical energy storage, and supercapacitor applications, the MF90A-4 ensures reliable, coordinated protection with minimal maintenance requirements. Its compact form factor and high interrupting capability make it a preferred choice for space-constrained installations where performance and safety are paramount.
  • Rated for 100VDC with 90A current capacity
  • Interrupting rating of 20kA at L/R ≤1.5ms
  • Minimum breaking capacity (MBC) of 320A for low-level fault response
  • Low watt loss (2.7W at 0.5In) and high cycling performance
  • Compact design (28g) with bolted connection for easy installation

Specifications

Amperage Rating
90 A
Application
Battery modules protection Electrical Energy Storage Supercapacitor module protection
Brand Name
Mersen
Connection
Bolted
DC Voltage Rating
100 V
Mounting
Bolted
Size
2.66 x 1 in
Size
67.6 x 25.4 mm
Special Features
Design for DC applications Low watt losses High cycling performance Full coverage of battery module voltage and current Ultra compact size Current Ratings (In): 50 to 200A Interrupting Rating: 20kA @ 100VDC, L/R =1.5ms
Standard
IEC 60 269-4 UL/cUL recognized component, UL file E76491 and E60314
Type
Battery Module Fuses
Voltage Rating
100 V
Package Dimensions (L x W x H)
2.66 in x 1 in x 1 in
Package Dimensions (L x W x H)
67.6 mm x 25.4 mm x 25.4 mm
Package Weight (Imperial)
0.150 lb
Package Weight (Metric)
0.068 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.