Mersen H079472 - Square Body High-Speed Fuse Protistor® Size 300 aR 2400VDC IEC 40A With Striker L Brackets
Mersen

H079472

Alternate Item Number: D300SE24C40QF


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Specification Sheet

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Overview

The Mersen H079472 is a high-speed DC fuse specifically engineered for demanding railway power and auxiliary circuit applications. This Protistor® fuse, designated as Size 300 aR, is built to operate reliably at 2400VDC and a current rating of 40A, delivering rapid and effective short-circuit protection. Its design prioritizes performance in elevated temperature environments, a critical factor in many rail systems. The H079472 minimizes damage to other components within the system by featuring low I²t values, which quantify the thermal energy let through during a fault. Furthermore, it contributes to overall system efficiency by reducing energy loss through its lower watts loss characteristics. The integrated striker mechanism, equipped with L brackets, provides a clear visual indication of fuse operation, and can also be utilized for remote signaling, thereby enhancing system monitoring and reliability. These fuse-links are meticulously optimized to meet the stringent requirements of modern DC equipment that operates under elevated temperatures and demands a long service life. Consequently, the Mersen H079472 is an ideal protection solution for critical applications such as traction power systems, DC switchgear, and essential auxiliary circuits within the rail industry.
  • 2400VDC rated for high-voltage DC applications
  • 40A current rating with Size 300 aR Protistor® design
  • Low I²t for minimized component damage on short circuits
  • Striker L brackets for visual/remote fuse operation indication
  • Optimized for elevated temperature operation and long service life

Specifications

Amperage Rating
40 A
Brand Name
Mersen
Case
Ceramic
Connection
L Brackets
Current Rating
40 A
DC Voltage Rating
2400 V
Mounting
Bolted
Mounting Type
L Brackets
Series
Protistor®
Size
10.55 x 2.28 x 2.48 in
Size
268 x 58 x 63 mm
Size
Size 300
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links DC Protection
Type Of Indicators
Striker
Voltage Rating
2400 V
Wattage
51 W
Package Dimensions (L x W x H)
10.55 in x 2.28 in x 2.48 in
Package Dimensions (L x W x H)
268 mm x 58 mm x 63 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.

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.
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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.