Mersen MF50A-4 - Battery Module Fuse 100VDC Max - 50A with Bolted Minimum breaking capacity: 180A Max. Rated Breaking Capacity DC: 20 kA @ 100 V L/R ≤ 1.5 ms
Mersen

MF50A-4

Alternate Item Number: MF50A-4

UPC: 782001482046


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Overview

The Mersen MF50A-4 is a specialized DC Over-Current Protection (O.C.P.) fuse, meticulously engineered for Battery Electrical Storage System (BESS) applications. As part of Mersen's M-fuse line-up, this component offers superior protection for battery modules by reliably clearing DC fault currents. Specifically designed and tested for DC applications, the MF50A-4 delivers best-in-class protection performance with a maximum voltage rating of 100VDC and a current rating (In) of 50A. It boasts a high Interrupting Rating (IR) of 20 kA at 100VDC with an L/R time constant of ≤ 1.5 ms, ensuring rapid and safe fault interruption. The Minimum Breaking Capacity (MBC) is rated at 180A, providing robust protection even at lower fault levels. Key features include low watt losses, high cycling performance, and an ultra-compact size, making it ideal for space-constrained battery systems. The Mersen MF50A-4 is designed for applications such as battery module protection, Electric Vehicles (EV), Hybrid Electric Vehicles (HEV), and Electrical Energy Storage systems. It meets stringent standards including Power Cycling & Vibrations (JASO D622) and is undergoing IATF - ISO/TS 16949 Quality management certification. Its bolted connection ensures secure and reliable integration into battery architectures. This fuse is a critical component for safeguarding valuable battery assets against damaging DC fault conditions, ensuring operational integrity and longevity.
  • Designed for DC applications, specifically battery modules and energy storage
  • 100VDC maximum voltage rating with a 50A current rating (In)
  • High interrupting capacity: 20 kA @ 100 VDC with L/R ≤ 1.5 ms
  • Minimum Breaking Capacity (MBC) of 180A for reliable fault clearing
  • Ultra-compact size with low watt losses and high cycling performance

Specifications

Amperage Rating
50 A
Application
Battery modules protection Electrical Energy Storage Supercapacitor module protection
Brand Name
Mersen
Connection
Bolted
Connection Type
Bolted
Current Rating
50 A
DC Voltage Rating
100 V
Material
M- fuse line-up
Mounting
Bolted
Series
M- fuse
Size
M- fuse line-up
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 VDC
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

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.