Mersen D079491 - Square Body High-Speed Fuse Protistor® Size 600 aR 4200VDC IEC 50A With Striker L Brackets
Mersen

D079491

Alternate Item Number: D600SE42C50QF


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Specification Sheet

Contact for Pricing

Overview

The Mersen D079491 is a Protistor® Square Body High-Speed Fuse specifically engineered for demanding DC applications, including critical railway power and auxiliary circuits. This fuse-link provides indispensable protection with a substantial rated voltage of 4200VDC and a precise current rating of 50A. It boasts an impressive breaking capacity of 160 kA, ensuring safety during fault conditions. The robust square body design is complemented by integrated L brackets, facilitating secure and reliable mounting. Furthermore, the inclusion of a striker offers a clear visual indication of fuse operation, simplifying diagnostics. Key performance advantages of the D079491 include significantly lower I²t values, which effectively minimize damage to protected components during short circuit events. It also offers reduced power dissipation, commonly referred to as watts loss, contributing to system efficiency. An extended operational life is another crucial benefit, ensuring long-term reliability. This high-speed fuse is therefore vital for guaranteeing the operational integrity and safety of high-power DC systems. Manufacturer: Mersen. SKU: D079491. UNSPSC Code: 39121628. Country of Origin: US.
  • Rated Voltage: 4200VDC
  • Rated Current: 50A
  • Breaking Capacity: 160 kA
  • Square body design with L brackets for mounting
  • Features a striker for visual indication of operation

Specifications

Amperage Rating
50 A
Brand Name
Mersen
Case
Ceramic
Connection
L Brackets
Current Rating
50 A
DC Voltage Rating
4200 V
Mounting
Bolted
Mounting Type
L Brackets
Series
Protistor®
Size
16.38 x 2.28 x 2.48 in
Size
416 x 58 x 63 mm
Size
Size 600
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links DC Protection
Type Of Indicators
Striker
Voltage Rating
4200 V
Wattage
103 W
Package Dimensions (L x W x H)
16.38 in x 2.28 in x 2.48 in
Package Dimensions (L x W x H)
416 mm x 58 mm x 63 mm
Package Weight (Imperial)
4.233 lb
Package Weight (Metric)
1.920 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.

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.