Mersen Y301344 - Square Body High-Speed Fuse Protistor® Size 73 gR 690VAC IEC 450A With Striker Flush ends metric threads
Mersen

Y301344

Alternate Item Number: PC73GB69V450TF


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Overview

The Mersen Y301344 Protistor® Square Body High-Speed Fuse (SKU: Y301344) is a Type 73 gR fuse-link designed for semiconductor and power conversion equipment protection in industrial applications. Rated at 690VAC (IEC), 450A, and 150kA breaking capacity, this fuse provides full-range protection against overloads and short circuits with a pre-arcing I²t of 34.1 kA²s and clearing I²t of 200 kA²s. The square body design features flush-end metric threads (M12) for secure mounting and compatibility with global installation standards. Engineered with pure silver, die-cut fuse elements embedded in solidified sand, the Y301344 optimizes arcing control for lower I²t values and high interrupting ratings. All contact surfaces are silver-plated, and hardware is non-magnetic to ensure long-term reliability. The fuse includes a striker for visual/tactile fault indication and can be equipped with a low-voltage trip indicator (microswitch compatible) for remote signaling. Key applications include semiconductor protection, motor drives, inverters, and DC link circuits in industrial power systems. The 79W power dissipation at rated current ensures thermal stability, while the 1.22kg package weight accommodates robust mounting requirements. Compliance with IEC standards ensures global interoperability, and the flush-end metric threads simplify integration into existing systems. Mersen’s Protistor® line is trusted in high-performance power electronics due to its precision engineering and adherence to strict electrical safety margins. The Y301344 is part of a scalable family of square-body fuses, offering flexibility in current ratings (315A–500A for 690VAC variants) to match diverse system requirements.
  • Rated 690VAC (IEC), 450A, 150kA breaking capacity
  • Square body with flush-end metric threads (M12) for secure mounting
  • Pure silver fuse elements in sand for optimized arcing control (I²t: 34.1 kA²s pre-arcing, 200 kA²s clearing)
  • Silver-plated contacts, non-magnetic hardware, and striker for fault indication
  • Compatible with low-voltage trip indicators (microswitch) for remote signaling

Specifications

AC Voltage Rating
690 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
End Contact with Threaded Holes
Connection Type
metric threads
Current Rating
450A
Material
Silver, Sand
Mounting
Bolted
Mounting Type
Square Body
Series
Protistor® gR
Size
2.91 x 2.87 x 3.09 in
Size
74 x 73 x 78.5 mm
Size
Size 73
Special Features
Excellent cycling capability Multiple body sizes and terminals or blades combination Extremely fast acting Eliminate all overloads Low I²t for improved semiconductor protection gR Class according to IEC 60269-4 and VDE 636-23
Standard
IEC 60269-4 Compliance
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links AC Protection
Type Of Indicators
Striker
Voltage Rating
690 V
Wattage
79 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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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.