Mersen W302975 - Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 450A With Striker Plain Blades
Mersen

W302975

Alternate Item Number: PC71UD13C450PA


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Overview

The Mersen W302975 Protistor® Size 71 aR high-speed fuse-link, identified by SKU W302975, is engineered for ultra-fast semiconductor protection, specifically tailored for power conversion equipment operating at demanding voltage levels of 1250VAC according to IEC standards and 1300VAC as per UL specifications. This square body fuse-link is meticulously designed to safeguard sensitive semiconductor devices such as thyristors, diodes, and IGBTs. It boasts a substantial current rating of 450A and an impressive interrupting rating of 126kA, providing robust and reliable fault interruption capabilities even in high-energy circuit environments. The internal fuse element is embedded within solidified sand, a critical design feature that facilitates controlled arcing and significantly reduces the I²t value, thereby minimizing thermal stress on protected components. Further enhancing its performance and longevity, the W302975 incorporates silver-plated contact surfaces for superior electrical conductivity and utilizes non-magnetic hardware to prevent unwanted magnetic interference. This fuse-link offers broad compatibility with various mounting styles commonly used globally. Additionally, it can be outfitted with a low-voltage trip indicator, often referred to as a striker, which enables remote fault signaling through the activation of a microswitch. The W302975 exhibits a power dissipation of 87W when operating at its rated current. The physical dimensions and construction contribute to a package weight of 0.5kg. Adhering to both IEC 1300VAC and UL 450A standards, this Protistor® fuse-link is an optimal choice for applications in industrial power electronics, motor drives, and renewable energy systems where precise and rapid semiconductor protection is paramount. The aR ultra-fast response characteristic is crucial for minimizing equipment downtime during fault events and concurrently maximizing the operational lifespan of the protected equipment.
  • Ultra-fast aR response for semiconductor protection (diodes, thyristors, IGBTs)
  • 1250/1300VAC rating with 450A current capacity and 126kA interrupting rating
  • Square body design with silver-plated contacts and non-magnetic hardware
  • Embedded in solidified sand for controlled arcing and reduced I²t
  • Optional low-voltage trip indicator (striker) for remote fault signaling

Specifications

AC Voltage Rating
1300 V
Amperage Rating
450 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
Plain Blades
Mounting
Clip
Size
5.88 x 2.01 x 2.22 in
Size
149.4 x 51 x 56.5 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 UL/CSA Recognized E76491 CCC GB 13539.4 for Asian market only
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links AC Protection
Type Of Indicators
Striker
Voltage Rating
1300 V
Wattage
95 W
Package Dimensions (L x W x H)
5.88 in x 2.01 in x 2.22 in
Package Dimensions (L x W x H)
149.4 mm x 51 mm x 56.5 mm
Package Weight (Imperial)
1.235 lb
Package Weight (Metric)
0.560 kg
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9F61 Size B Clips 1.6in

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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.

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.