Mersen L301034 - Square Body High-Speed Fuse Protistor® Size 71 aR 1100VAC IEC 1200VAC UL 550A With Striker Flush ends UNC threads
Mersen

L301034

Alternate Item Number: A120UD71TTI550

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Specification Sheet

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Overview

The Mersen L301034 is a high-speed, ultra-fast acting Protistor® fuse-link from the Size 71 series, engineered for superior semiconductor protection. This aR rated fuse is designed to safeguard critical power conversion equipment, including diodes, thyristors, and IGBT devices, by providing exceptional protection against overcurrents and short circuits. It features a robust square body construction with flush ends and UNC threaded terminals for secure mounting. The L301034 boasts a rated voltage of 1100VAC according to IEC standards and 1200VAC according to UL standards, with a substantial rated current of 550A. Its construction incorporates die-cut elements embedded in solidified sand, a design that effectively controls arcing characteristics, resulting in a low I²t value of 84 kA²s and a high interrupting rating of 150 kA. This ensures minimal damage to protected components during fault events. All contact surfaces are silver-plated for optimal conductivity, and non-magnetic hardware is utilized throughout. For enhanced system monitoring, this fuse-link can be equipped with an optional low-voltage trip-indicator, which can activate a field-mountable microswitch. With a power dissipation of 98W at its rated current, the L301034 offers efficient operation. Its dimensions and weight (0.5 kg) are consistent with the Size 71 Protistor® range, facilitating design flexibility and integration into various equipment configurations. Trust Mersen's expertise for reliable and advanced semiconductor protection with the L301034.
  • Mersen Protistor® Size 71 aR Fuse-Link
  • 550A Rated Current
  • 1100VAC (IEC) / 1200VAC (UL) Rated Voltage
  • 150 kA Interrupting Capacity
  • Ultra-fast acting for semiconductor protection

Specifications

AC Voltage Rating
1200 V
Amperage Rating
550 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
550A
Material
Silver-plated, non-magnetic hardware
Material
Silver plated, solidified sand
Mounting
Bolted
Mounting Type
Flush ends
Series
Protistor®
Size
2.91 x 2.01 x 2.22 in
Size
74 x 51 x 56.5 mm
Size
Size 71
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
1200 V
Voltage Rating
1100VAC/1200VAC
Voltage Rating
1100VAC / 1200VAC
Wattage
98 W
Package Dimensions (L x W x H)
2.91 in x 2.01 in x 2.22 in
Package Dimensions (L x W x H)
74 mm x 51 mm x 56.5 mm
Package Weight (Imperial)
1.102 lb
Package Weight (Metric)
0.500 kg

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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.