Mersen F209305 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T4 12kVAC IEC 6.3A d56mm, L292mm With Striker Standard 80N
Mersen

F209305

Alternate Item Number: 45DB120V6,3P

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Overview

The Mersen F209305 is a high-voltage DIN back-up fuse, specifically designed for transformer protection within high-voltage switchgear, controlgear, and systems. Adhering to the IEC 60282-1 standard, this Limitor®-P fuse is engineered to safeguard transformers against the damaging effects of short-circuit currents. Manufactured by Mersen, a trusted name in electrical protection, this unit boasts a rated voltage of 12kVAC and a rated current of 6.3A. Its construction prioritizes reliability and longevity, utilizing premium materials such as pure silver for fuse elements, silver-coated copper for caps, and a durable ceramic body. The fuse features a striker mechanism with a standard force of 80N, providing a clear indication upon operation. With a breaking capacity of 63 kA and an I²t rating of 6 kA²s at rated voltage, it offers robust protection for critical infrastructure. The physical dimensions include a diameter of 56mm and a length of 292mm, ensuring compatibility with standard DIN fuse holders. The cold resistance is rated at 78 mΩ, with a power dissipation of 73W at its nominal current. Each unit weighs 2.2 kg and is packaged individually. This fuse is manufactured in the US and is compliant with VDE T4 standards, making it a reliable choice for demanding electrical applications where transformer integrity is paramount. Its robust design and high-quality components ensure dependable performance and extended service life in challenging environments.
  • Designed for transformer protection against short-circuit currents (IEC 60282-1)
  • Rated for 12kVAC with a 6.3A current rating
  • Constructed with pure silver fuse elements and silver-coated copper caps for high conductivity
  • Features a standard 80N striker for clear fault indication
  • Durable ceramic body and 63 kA breaking capacity ensure reliable operation

Specifications

AC Voltage Rating
12 kV
Amperage Rating
6.3 A
Application
HV Transformer protection
Body Material
Ceramic
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Silver-Plated Copper
Interrupt Rating
63 kA
Mounting
Clip
Size
14.09 x 2.2 in
Size
358 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
Package Dimensions (L x W x H)
14.09 in x 2.2 in x 2.2 in
Package Dimensions (L x W x H)
358 mm x 56 mm x 56 mm
Package Weight (Imperial)
3.748 lb
Package Weight (Metric)
1.700 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.