Mersen X209343 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T4 24kVAC IEC 25A d56mm, L442mm With Striker Standard 80N
Mersen

X209343

Alternate Item Number: 45DB240V25P

Contact for Pricing

Overview

The Mersen X209343 is a high-performance DIN back-up fuse specifically engineered for the reliable protection of transformers in high-voltage systems. Designed to meet IEC 60282-1 standards, this fuse acts as a critical safeguard against the damaging effects of short-circuit currents. With a rated voltage of 24kVAC and a current rating of 25A, the X209343 is built with Mersen's commitment to quality, utilizing premium materials. The fuse element is constructed from pure silver, ensuring excellent conductivity and longevity. The caps are made of silver-coated copper, and the body is crafted from durable ceramic, providing robust insulation and thermal management. This specific model features a striker mechanism with a standard 80N force, facilitating rapid disconnection and signaling. Its physical dimensions are a diameter of 56mm and a length of 442mm, designed for compatibility with standard DIN fuse holders in high-voltage switchgear and controlgear. Mersen's Limitor®-P series, to which this fuse belongs, has a proven track record spanning decades in safeguarding critical electrical infrastructure. The X209343 offers a breaking capacity of 63 kA, ensuring it can safely interrupt fault currents. Its I²t clearing capability is 104 kA²s, providing precise protection against overcurrents. The minimum breaking current (I3) is 460A, and the cold resistance (R20) is 19 mΩ, contributing to efficient operation and minimal power loss. The power dissipation at its rated current is 196W, a key consideration for thermal management within the switchgear. This fuse is manufactured in the US, adhering to stringent quality control standards. For applications requiring dependable transformer protection in 24kVAC systems, the Mersen X209343 offers a robust and reliable solution.
  • Mersen X209343 High Voltage DIN Back-up Fuse
  • Rated for 24kVAC and 25A applications
  • Designed for transformer protection against short circuits
  • IEC 60282-1 compliant with 63kA breaking capacity
  • Features a standard 80N striker mechanism

Specifications

AC Voltage Rating
24 kV
Amperage Rating
25 A
Application
HV Transformer protection
Body Material
Ceramic
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Silver-Plated Copper
Current Rating
25 A
Interrupt Rating
63 kA
Material
Ceramic, Silver, Copper
Mounting
Clip
Series
Limitor® VDE T4
Size
d56mm, L442mm
Size
20 x 2.2 in
Size
508 x 56 mm
Special Features
High breaking capacity High current limitation Low switching voltage Quick breaking Medium striker 80N/30mm Indoor and outdoor applications Energy efficency New cap design for a better compatibility with all types of clips and easier assembly Coordination with IEC 60787, IEC 62271-105, IEC/TR 62655
Standard
IEC 60282-1 VDE 0670 part 4 DIN 43625
Sub Brand
Limitor®
Type
DIN HV Back-up Fuses for Transformers
Type Of Indicators
Striker
Voltage Rating
24 kVAC
Package Dimensions (L x W x H)
20 in x 2.2 in x 2.2 in
Package Dimensions (L x W x H)
508 mm x 56 mm x 56 mm
Package Weight (Imperial)
5.071 lb
Package Weight (Metric)
2.300 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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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.