Mersen S1045205 - High Voltage UTE Back-up fuse Limitor® 24kVAC IEC 10A d55mm, L520mm
Mersen

S1045205

Alternate Item Number: FRECO240V10

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Overview

The Mersen S1045205 is a high-voltage UTE back-up fuse designed for 24kVAC applications, rated at 10A with a 55mm diameter and 520mm length. Engineered for use in HV/LV power distribution transformers, this current-limiting fuse-link interrupts fault currents before they peak, preventing damage to downstream equipment. The fuse is optimized for SF6-insulated or compact air-insulated switchgear, offering very low power losses (25W at rated current). Its construction includes a class F insulating synthetic barrel, nickel-plated aluminum end contacts, pure silver fuse elements, and a high-temperature composite fuse element holder, ensuring reliability in harsh HV bay environments. The S1045205 is part of Mersen’s Limitor® FR series, designed for coordination with other protective equipment. Key specifications include a minimum breaking current of 50A, an operating I²t of 1.3 kA²s at rated voltage, and a package weight of 2.1 kg. This fuse is ideal for transformer protection in industrial, utility, and renewable energy applications where high fault current interruption and low power dissipation are critical.
  • Rated voltage: 24kVAC (IEC)
  • Rated current: 10A with 50A minimum breaking current
  • Low power dissipation: 25W at rated current
  • Dimensions: 55mm diameter x 520mm length
  • Operating I²t: 1.3 kA²s at rated voltage
  • Weight: 2.1 kg (without striker)
  • Designed for SF6-insulated or compact air-insulated switchgear
  • Class F insulating synthetic barrel with nickel-plated aluminum contacts
  • Pure silver fuse elements for high-temperature stability

Specifications

AC Voltage Rating
24 kV
Amperage Rating
10 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
10 A
Interrupt Rating
12.5 kA
Material
Synthetic material, Nickel-plated Aluminium, Silver
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.

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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.

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.