Mersen H079495 - Square Body High-Speed Fuse Protistor® Size 600 aR 4200VDC IEC 125A With Striker L Brackets
Mersen

H079495

Alternate Item Number: D600SE42C125QF


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Specification Sheet

Contact for Pricing

Overview

The Mersen H079495 Protistor® is a high-speed fuse-link designed for critical DC semiconductor protection, specifically in railway power and auxiliary circuits. This square body fuse, SKU H079495, is rated for 125 Amperes and an impressive 4200 Volts DC interrupting capacity, adhering to IEC standards. Its primary function is to provide precise and rapid protection for sensitive DC equipment, particularly those operating under elevated temperature conditions common in traction power systems. The fuse's low I²t (current squared times time) characteristic is crucial for minimizing damage to protected components during short-circuit events, thereby reducing costly downtime and maintenance requirements. Furthermore, the H079495 offers lower watts loss compared to conventional fuses, contributing to improved energy efficiency and an extended operational life, ensuring reliable performance in demanding applications. Equipped with striker L brackets, this fuse-link facilitates both visual and remote indication of fuse operation, enhancing system safety, diagnostics, and operational awareness. It is an ideal choice for DC distribution networks, auxiliary converters, and traction power systems where fast-acting, high-reliability protection is paramount. Manufactured in Mexico.
  • High-speed DC semiconductor fuse-link for railway applications
  • Rated 125A with 4200VDC interrupting capacity
  • IEC compliant for reliable protection
  • Low I²t minimizes damage to protected components
  • Striker L brackets for visual or remote fuse operation indication

Specifications

Amperage Rating
125 A
Brand Name
Mersen
Case
Ceramic
Connection
L Brackets
Connection Type
Brackets
Connection Type
L Brackets
Current Rating
125 A
DC Voltage Rating
4200 V
Material
Silver, Sand
Mounting
Bolted
Mounting Type
Striker
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
Size
Size 600 aR
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links DC Protection
Type Of Indicators
Striker
Voltage Rating
4200 V
Wattage
147 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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Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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

9F61BWW460

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.