Mersen S300741 - Square Body High-Speed Fuse Protistor® 2x73 aR 850VAC IEC 2800A With Striker Plates with Metric Threaded Holes
Mersen

S300741

Alternate Item Number: PC76UD85V28CP11


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Specification Sheet

Contact for Pricing

Overview

The Mersen S300741 Protistor® square body high-speed fuse-link (SKU: S300741) delivers ultra-fast semiconductor protection for power conversion systems operating up to 850VAC (IEC) / 900VAC (UL). Designed specifically for IGBT, thyristor, and diode circuits, this aR-rated fuse features a 2x73 body with M12 metric threaded holes and striker plates for reliable tripping under fault conditions. With a rated current of 2800A and an interrupting rating of 200kA, it effectively handles extreme fault currents while maintaining low power dissipation of 330W, ensuring energy efficiency and reduced thermal stress. The fuse-link incorporates silver-plated contact surfaces to minimize resistance and non-magnetic hardware to prevent magnetic interference, ensuring consistent performance under high thermal and mechanical stress. Its pre-arcing I²t of 1855 kA²s and clearing I²t of 8800 kA²s enable precise fault isolation, reducing the risk of equipment damage and downtime. The S300741 is compatible with Protistor® size 70/73 systems and supports global mounting standards, including IEC 60269-4 compliance for semiconductor protection applications. Additional features include optional low-voltage trip indicators for remote signaling, enhancing system monitoring and safety. This fuse-link is ideal for demanding applications such as motor drives, inverters, and renewable energy systems where reliable, high-speed protection is critical. The combination of high interrupting capacity, low power dissipation, and robust construction makes the S300741 a dependable solution for protecting sensitive power electronics in industrial and renewable energy environments.
  • Ultra-fast aR-rated protection for IGBTs, thyristors, and diodes
  • Rated 850VAC (IEC) / 900VAC (UL), 2800A, 200kA interrupting capacity
  • Square body (2x73) with M12 metric threaded holes and striker plates
  • Pre-arcing I²t: 1855 kA²s, Clearing I²t: 8800 kA²s
  • Silver-plated contacts, non-magnetic hardware, low 330W power dissipation

Specifications

AC Voltage Rating
850 V
Amperage Rating
2800 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
Plates with Metric Threaded Holes
Connection Type
Metric Threaded Holes
Current Rating
2800A
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
Mounting Type
Metric Threaded Holes
Series
Protistor®
Size
Square Body 2x73
Size
3.07 x 6.71 x 3.09 in
Size
78 x 170.5 x 78.5 mm
Special Features
Multiple body sizes and terminals or blades combination aR Class according to IEC 60269-4 and VDE 636-23 Very low I²t for improved semiconductor protection Ultra fast acting Current limiting Superior cycling capability
Standard
IEC 60269-4 Compliance
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links AC Protection
Type Of Indicators
Striker
Voltage Rating
850 V
Wattage
440 W
Package Dimensions (L x W x H)
3.07 in x 6.71 in x 3.09 in
Package Dimensions (L x W x H)
78 mm x 170.5 mm x 78.5 mm
Package Weight (Imperial)
6.834 lb
Package Weight (Metric)
3.100 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.