Mersen L1047361 - High Voltage UTE Back-up fuse Limitor® 24kVAC IEC 31.5A d55mm, L520mm
Mersen

L1047361

Alternate Item Number: FRECO240V31,5

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Overview

The Mersen L1047361 is a Limitor® FR-type High Voltage UTE Back-up fuse, specifically designed for the protection of HV/LV power distribution transformers. Rated for 24kVAC and 31.5A, this current-limiting fuse-link is engineered to interrupt fault currents before they reach their peak, ensuring the integrity of connected equipment. Its design allows for fault current interruption within the fuse-link body, with no external signs of the event. These 24kV fuses feature very low power losses, making them ideal for use in SF6-insulated or compact air-insulated fused switchgear combinations. Key construction elements include a barrel made of class F insulating synthetic material, nickel-plated aluminum end contacts, pure silver fuse elements, and a composite material fuse element holder designed to withstand high temperatures. The synthetic material construction of these FR fuse-links makes them exceptionally resilient to the stresses encountered in HV bays and fuse-link chambers. Specifications include a rated voltage of 24 kV AC (IEC), a rated current (In) of 31.5 A, a minimum breaking current (I3) of 157.5 A, and a power dissipation at In of 53 W. The operating I²t at rated voltage is 18.8 kA²s. This fuse has a diameter of 55mm and a length of 520mm, with a package weight of 2.1 kg. SKU: L1047361. UNSPSC Code: 39121626. Country of Origin: US.
  • Mersen Limitor® FR-type High Voltage UTE Back-up Fuse
  • Rated for 24kVAC and 31.5A for transformer protection
  • Current-limiting design interrupts fault currents effectively
  • Durable construction with synthetic material barrel and silver fuse elements
  • Low power losses, suitable for SF6 or air-insulated switchgear

Specifications

AC Voltage Rating
24 kV
Amperage Rating
31.5 A
Application
HV Transformers protection Fused switch gear combination Best used in SF6 insulated switch gear and compact switch gear For indoor use Operating temperature: -25°C to +40°C
Body Material
Class F insulating synthetic material
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Nickel-Plated Aluminum
Current Rating
31.5 A
Interrupt Rating
12.5 kA
Material
Class F insulating synthetic material, nickel-plated aluminum, pure silver, composite material
Mounting
Clip
Series
Limitor® FR-type
Size
20.47 x 2.17 in
Size
520 x 55 mm
Size
d55mm, L520mm
Special Features
Superior mechanical strength Outstanding withstand to operating stresses 100 synthetic structure Reduce power losses by 30 to 40 (24kV) Average type striker: force 1 ±0.5 Joules High breaking capacity High current limitation EDF Approval which guarantees high performances and quality of fuses manufactured (24kV) In accordance with: IEC 62271-105 IEC 62271-107 IEC 60787 IEC/TR 62655
Standard
IEC 60282-1 UTE C64-210
Sub Brand
Limitor®
Type
NF/UTE HV Back-up Fuses for Transformers
Voltage Rating
24 kVAC
Package Dimensions (L x W x H)
20.47 in x 2.17 in x 2.17 in
Package Dimensions (L x W x H)
520 mm x 55 mm x 55 mm
Package Weight (Imperial)
4.630 lb
Package Weight (Metric)
2.100 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.