Mersen X210240 - High Voltage UTE Back-up fuse Limitor® 12kVAC IEC 6.3A d55mm, L520mm
Mersen

X210240

Alternate Item Number: FR120V6,3

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Overview

The Mersen X210240 Limitor® is a high-voltage UTE back-up fuse designed for transformer protection in power distribution systems. Rated at 12kVAC and 6.3A, this fuse is engineered to interrupt fault currents before they reach peak levels, safeguarding critical equipment. Its current-limiting design ensures coordination with downstream protective devices, reducing stress on the entire system. Constructed with a class F insulating synthetic barrel, nickel-plated aluminum end contacts, and pure silver fuse elements, the X210240 withstands high thermal and mechanical stresses in HV bays and fuse-link chambers. The composite material fuse element holder enhances thermal resilience, while the low power dissipation of 25W at rated current minimizes energy loss. With a minimum breaking current of 31.5A and an operating I²t of 0.32 kA²s, this fuse is optimized for SF6-insulated or compact air-insulated switchgear combinations. Key specifications include a 55mm diameter, 520mm length, and a package weight of 2.1 kg. Manufactured in the US, the X210240 is part of Mersen’s Limitor® series, a trusted solution for reliable fault protection in medium-voltage applications.
  • Rated 12kVAC, 6.3A for transformer protection in power distribution systems
  • Current-limiting design interrupts fault currents before peak levels
  • Low power dissipation of 25W at rated current for energy efficiency
  • Constructed with class F insulating barrel, nickel-plated aluminum contacts, and pure silver fuse elements
  • Optimized for SF6-insulated or compact air-insulated switchgear combinations

Specifications

AC Voltage Rating
12 kV
Amperage Rating
6.3 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
6.3 A
Interrupt Rating
12.5 kA
Material
Class F insulating synthetic material, nickel-plated aluminum, pure silver, composite material
Material
Class F insulating synthetic material, nickel plated aluminium, pure silver, composite material
Mounting
Clip
Series
Limitor®
Size
20.47 x 2.17 in
Size
520 x 55 mm
Size
d55mm, L520mm
Size
55mm diameter, 520mm length
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
12 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.