Mersen K301056 - Square Body High-Speed Fuse Protistor® Size 73 aR 1000VAC IEC 1100VAC UL 1000A With Striker Flush ends UNC threads
Mersen

K301056

Alternate Item Number: A110UD73TTI1000

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Specification Sheet

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Overview

The Mersen K301056 is a Size 73 Protistor® aR high-speed fuse-link, engineered for superior semiconductor protection. This fuse is designed to safeguard diodes, thyristors, and IGBT devices in modern power conversion equipment. It features a square body construction with flush ends and UNC threaded terminals, offering robust mechanical integrity and ease of mounting. Rated for 1000VAC (IEC) and 1100VAC (UL), with a nominal current of 1000A, this fuse provides exceptional protection. Its construction incorporates die-cut elements embedded in solidified sand, which meticulously controls arcing characteristics, resulting in a low I²t value of 370 kA²s (pre-arcing) and 1920 kA²s (clearing at rated voltage). The breaking capacity is rated at 150 kA AC. All contact surfaces are silver-plated, and non-magnetic hardware is utilized to prevent unwanted magnetic interference. The K301056 is equipped with a striker mechanism, facilitating integration with trip indication systems. This fuse-link offers a power dissipation of 174W at its rated current and has a package weight of 3 kg. It is part of a product range designed for maximum flexibility in equipment design, with multiple worldwide acceptable mounting styles available across different body sizes. The Protistor® series is known for its ability to provide state-of-the-art protection for sensitive semiconductor components, ensuring operational reliability and longevity in demanding applications.
  • Mersen Protistor® Size 73 aR high-speed fuse-link
  • Rated 1000VAC (IEC) / 1100VAC (UL) and 1000A
  • Designed for semiconductor protection (diodes, thyristors, IGBTs)
  • Square body with flush ends and UNC threaded terminals
  • Includes striker for trip indication integration

Specifications

AC Voltage Rating
1100 V
Amperage Rating
1000 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
UNC threads
Current Rating
1000A
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
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
1100 V
Voltage Rating
1000Vac
Wattage
152 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)
2.756 lb
Package Weight (Metric)
1.250 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.