Mersen N079431 - Square Body High-Speed Fuse Protistor® Size 72 aR 1200VDC IEC 315A With Striker L Brackets
Mersen

N079431

Alternate Item Number: D72SG120V315QF


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Specification Sheet

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Overview

The Mersen N079431 Protistor® Size 72 aR fuse-link is engineered for high-speed DC circuit protection, specifically for demanding railway power and auxiliary circuits. This fuse-link features a robust 1200 VDC rating and a 315 A current capacity, ensuring reliable operation in critical applications. Its construction utilizes silver for superior electrical conductivity and enhanced thermal performance, contributing to its efficiency and longevity. Designed to operate effectively at elevated temperatures, the N079431 delivers lower I²t values. This specification is crucial for minimizing equipment damage during short-circuit events and also contributes to reduced watt loss, thereby improving overall system efficiency. The integrated striker mechanism provides remote indication of fuse operation, a key feature for operational monitoring and maintenance. For secure and stable installation in industrial settings, the fuse-link is equipped with L-bracket mounting. Its compact Size 72 footprint makes it an optimized choice for modern DC equipment that requires precise protection and a long service life. SKU: N079431. Manufacturer: Mersen. UNSPSC Code: 39121628. Country of Origin: Mexico.
  • High-speed DC circuit protection for railway applications
  • Rated for 1200VDC and 315A
  • Silver construction for superior conductivity and thermal performance
  • Striker mechanism for remote fuse operation indication
  • L-bracket mounting for secure installation

Specifications

Amperage Rating
315 A
Application
Protection of inverters Protection of motor drives Protection of UPS systems Railway power and auxiliary circuits ESS Battery Rack protection up to 1500VDC
Brand Name
Mersen
Case
Ceramic
Connection
L Brackets
Current Rating
315 A
DC Voltage Rating
1200 V
Material
Silver
Mounting
Bolted
Mounting Type
L Brackets
Series
Protistor®
Size
6.42 x 2.36 x 3.01 in
Size
163 x 60 x 76.5 mm
Size
Size 72
Special Features
Extremely fast acting Excellent cycling capability Very low I²t Worldwide acceptability Current Limiting Superior Cycling Ability
Standard
IEC 60269-1 and IEC 60269-4 Compliance DC UL recognized component UL file E76491 - 160A-420A, @1200VDC, L/R 10ms, 100KA - 160A-420A, @1500VDC, L/R 1-3ms, 100KA GB/T 13539.4-2016
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links DC Protection
Type Of Indicators
Striker
Voltage Rating
1200 V
Wattage
110 W
Package Dimensions (L x W x H)
6.42 in x 2.36 in x 3.01 in
Package Dimensions (L x W x H)
163 mm x 60 mm x 76.5 mm
Package Weight (Imperial)
2.535 lb
Package Weight (Metric)
1.150 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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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.