Mersen R300740 - Square Body High-Speed Fuse Protistor® 2x73 aR 900VAC IEC 2500A With Striker Plates with Metric Threaded Holes
Mersen

R300740

Alternate Item Number: PC76UD90V25CP11


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Specification Sheet

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Overview

The Mersen R300740 is a size 73 aR Protistor® square body high-speed fuse-link designed for ultimate semiconductor protection. Engineered for AC protection, this fuse operates at a rated voltage of 900VAC (IEC) and 1000V (UL), with a rated current of 2500A. It features ultra-fast acting characteristics crucial for safeguarding diodes, thyristors, and IGBT devices in power conversion equipment. The fuse construction utilizes die-cut elements embedded in solidified sand, which precisely controls arcing for a lower I²t value and a high interrupting rating of 150 kA. This design ensures superior protection against damaging overcurrents and short circuits. The R300740 is equipped with striker plates and metric threaded holes for secure mounting and integration into various equipment designs. All contact surfaces are silver-plated, and hardware is non-magnetic to prevent interference and ensure reliable performance. This fuse-link can also be fitted with a low voltage trip-indicator, enabling operation of a field-mountable microswitch for remote signaling of fuse status. Key specifications include a pre-arcing I²t of 370 kA²s and a clearing I²t at rated voltage of 1920 kA²s. The power dissipation at rated current is 174W. Manufactured by Mersen, this fuse (SKU: R300740) is made in the USA and adheres to stringent IEC standards.
  • Mersen Protistor® size 73 aR square body high-speed fuse
  • Rated voltage: 900VAC (IEC) / 1000V (UL)
  • Rated current: 2500A
  • Interrupting rating: 150 kA
  • Features striker plates and metric threaded holes for mounting

Specifications

AC Voltage Rating
900 V
Amperage Rating
2500 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
2x73 A
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
Mounting Type
Metric Threaded Holes
Series
Protistor®
Size
3.07 x 6.71 x 3.09 in
Size
78 x 170.5 x 78.5 mm
Size
Square body
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
900 V
Wattage
390 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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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

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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.