Mersen W300514 - Square Body High-Speed Fuse Protistor® Size 73 aR 950VAC IEC 1000VAC UL 1100A With Striker Flush ends metric threads
Mersen

W300514

Alternate Item Number: PC73UD95V11CTF


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Specification Sheet

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Overview

The Mersen W300514 Protistor® square body fuse-link (SKU: W300514) is engineered for the critical protection of semiconductor devices. This ultra-fast acting fuse features a Size 73 body, providing a robust 1100A current rating. It is certified to 950VAC according to IEC standards and 1000VAC according to UL standards, ensuring broad applicability. The fuse is designed with flush ends and metric threads for secure and precise mounting. Its construction utilizes die-cut elements embedded in solidified sand, a method that effectively controls arcing characteristics. This results in a significantly lower I²t value and a high interrupting rating, crucial for safeguarding sensitive power conversion equipment such as diodes, thyristors, and IGBT devices. All contact surfaces are silver-plated, and the hardware is non-magnetic to prevent interference. This model is also compatible with a low voltage trip-indicator for integration with field-mountable microswitches. Manufactured in the US, the W300514 offers maximum flexibility in equipment design and ultimate protection for demanding applications.
  • Ultra-fast acting fuse-link for semiconductor protection
  • Size 73 square body with 1100A current rating
  • 950VAC IEC and 1000VAC UL voltage ratings
  • Flush ends with metric threads for mounting
  • Low I²t and high interrupting rating construction

Specifications

AC Voltage Rating
1000 V
Amperage Rating
1100 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
End Contact with Threaded Holes
Connection Type
metric threads
Connection Type
Flush ends with metric threads
Current Rating
1100 A
Material
Silver-plated contact surfaces, non-magnetic hardware
Material
Silver-plated contact surfaces, non-magnetic hardware, die-cut elements in solidified sand
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
Mounting Type
Flush ends with metric threads
Mounting Type
Flush ends
Series
Protistor®
Size
2.91 x 2.87 x 3.09 in
Size
74 x 73 x 78.5 mm
Size
Size 73
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
1000 V
Voltage Rating
950VAC IEC / 1000VAC UL
Voltage Rating
950VAC/1000VAC
Voltage Rating
950 VAC (IEC), 1000 VAC (UL)
Wattage
168 W
Package Dimensions (L x W x H)
2.91 in x 2.87 in x 3.09 in
Package Dimensions (L x W x H)
74 mm x 73 mm x 78.5 mm
Package Weight (Imperial)
2.690 lb
Package Weight (Metric)
1.220 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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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.