Mersen X209366 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T402 36kVAC IEC 25A d56mm, L537mm With Striker 80N
Mersen

X209366

Alternate Item Number: 45DB360V25PD

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Overview

The Mersen X209366 is a high-voltage DIN back-up fuse, specifically designed for transformer protection within high-voltage switchgear and controlgear systems. Adhering to VDE T402 and IEC 60282-1 standards, this fuse is engineered to safeguard transformers against the damaging effects of short-circuit currents. With a rated voltage of 36kVAC and a current rating of 25A, the X209366 offers robust protection. Its construction utilizes premium materials, including pure silver fuse elements, silver-coated copper caps, and a ceramic body, ensuring reliability and longevity. This particular model features a striker mechanism with an 80N force, crucial for signaling fuse operation. The fuse has a diameter of 56mm and a length of 537mm, fitting standard DIN fuse holders. Mersen's Limitor®-PD HV fuses are a trusted choice for decades in demanding electrical infrastructure. The X209366 is a component of the Limitor®-PD series, which are specifically designed for transformer protection. The Limitor®-PD fuses are characterized by their high breaking capacity, ensuring safe interruption of fault currents. The fuse element is made of pure silver, providing excellent conductivity and resistance to corrosion. The silver-coated copper caps ensure low contact resistance and durable connections. The ceramic body offers excellent dielectric strength and thermal resistance, essential for high-voltage applications. The striker mechanism, with its 80N force, is designed to reliably activate associated tripping mechanisms upon fuse operation, providing a clear visual or electrical indication of a blown fuse. This feature is critical for rapid fault isolation and system maintenance. The dimensions of the X209366, a diameter of 56mm and a length of 537mm, are in accordance with DIN standards, ensuring compatibility with a wide range of existing DIN fuse holders and switchgear. For applications requiring different current ratings within the VDE 0670 T402 standard (6.3A to 160A), consult the broader Limitor®-P HV fuses range. The X209366 is manufactured in the US and carries the SKU X209366.
  • Designed for transformer protection in high-voltage systems
  • VDE T402 and IEC 60282-1 compliant
  • Rated for 36kVAC and 25A
  • Features an 80N striker for operation indication
  • Constructed with high-quality silver elements, copper caps, and ceramic body

Specifications

AC Voltage Rating
36 kV
Amperage Rating
25 A
Application
HV Transformer protection
Body Material
Ceramic
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Silver-Plated Copper
Interrupt Rating
32 kA
Mounting
Clip
Size
23.74 x 2.2 in
Size
603 x 56 mm
Special Features
High breaking capacity High current limitation Low switching voltage Quick breaking medium striker 80N/30mm 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 Indoor and outdoor applications
Standard
IEC 60282-1 VDE 0670 part 4 VDE 0670 part 402 DIN 43625
Sub Brand
Limitor®
Type
DIN HV Back-up Fuses for Transformers
Type Of Indicators
Striker
Package Dimensions (L x W x H)
23.74 in x 2.2 in x 2.2 in
Package Dimensions (L x W x H)
603 mm x 56 mm x 56 mm
Package Weight (Imperial)
5.952 lb
Package Weight (Metric)
2.700 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.