Mersen C079444 - Square Body High-Speed Fuse Protistor® Size 70 aR 1200VDC IEC 200A With Striker L Brackets
Mersen

C079444

Alternate Item Number: D70SF120V200QF


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Specification Sheet

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Overview

The Mersen Protistor® C079444 (Z300839) is a high-speed fuse-link designed for semiconductor protection in DC systems. This square body, Size 70 aR-rated fuse operates at 1200VDC with a nominal current rating of 200A. It features L-brackets for secure mounting and includes a striker mechanism to signal fuse operation. Key specifications include a rated breaking capacity of 126 kA, pre-arcing I²t of 4730 A²s, and clearing I²t of 38000 A²s at rated voltage. The fuse-link is optimized for elevated operating temperatures with lower I²t values to minimize damage during short circuits and reduced power dissipation (56W at 200A) for extended service life. Engineered for modern DC equipment, particularly railway power and auxiliary circuits, this fuse-link ensures operational reliability and component longevity in high-power systems. The Protistor® series is a trusted solution for protecting sensitive semiconductor devices in demanding industrial applications.
  • Rated for 200A nominal current at 1200VDC
  • Square body design with Size 70 form factor
  • Striker L brackets for secure mounting and operation signaling
  • Rated breaking capacity: 126 kA
  • Pre-arcing I²t: 4730 A²s, Clearing I²t: 38000 A²s

Specifications

Amperage Rating
200 A
Application
Protection of inverters Protection of motor drives Protection of UPS systems Railway power and auxiliary circuits ESS Battery Rack protection up to 1500 VDC
Brand Name
Mersen
Case
Ceramic
Connection Type
L Brackets
Current Rating
200A
DC Voltage Rating
1200 V
Material
Silver
Mounting
Bolted
Mounting Type
Square Body
Series
Protistor®
Size
6.42 x 1.5 x 2.47 in
Size
163 x 38 x 62.7 mm
Size
Size 70
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 - 20A-215A, @1200VDC, L/R 10ms, 100KA - 20A-215A, @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
Voltage Rating
1200VDC
Wattage
65.5 W
Package Dimensions (L x W x H)
6.42 in x 1.5 in x 2.47 in
Package Dimensions (L x W x H)
163 mm x 38 mm x 62.7 mm
Package Weight (Imperial)
1.499 lb
Package Weight (Metric)
0.680 kg
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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.