Mersen W1000105 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T4 12kVAC IEC 4A d56mm, L292mm With Striker Standard 80N
Mersen

W1000105

Alternate Item Number: 45DB120V4P

Contact for Pricing

Overview

The Mersen Limitor®-P HV back-up fuse (SKU: W1000105) is a high-voltage fuse-link specifically engineered for transformer protection within medium-voltage switchgear and controlgear applications. This fuse-link operates at a rated voltage of 12 kVAC, adhering to the rigorous requirements of IEC 60282-1 standards for high-voltage fuses. It is designed to provide robust and reliable short-circuit current protection for transformers, fulfilling the stringent VDE T4 classification. The Limitor®-P HV fuse is characterized by a precise 4A current rating. Its physical dimensions include a diameter of 56mm and a length of 292mm, ensuring seamless compatibility with standard DIN back-up fuse holders commonly found in electrical installations. The internal construction of this fuse-link is optimized for performance and longevity. It incorporates pure silver fuse elements, which offer excellent conductivity and resistance to corrosion. The fuse caps are made from silver-coated copper, further enhancing electrical contact and reducing resistive losses. The main body of the fuse is constructed from a high-strength ceramic material, providing superior thermal and mechanical stability under demanding operating conditions. To facilitate rapid fault identification, the Limitor®-P HV fuse is equipped with an integrated striker pin. This striker operates with a standard force of 80N, and its activation provides both visual and mechanical indication that the fuse has operated, thereby enabling swift fault detection in high-voltage systems. This fuse-link is certified for transformer protection applications, making it an ideal choice for critical infrastructure such as industrial power distribution networks, electrical substations, and the integration of renewable energy sources where precise and rapid fault isolation is paramount to system integrity and safety. The standardized dimensions and compact design of the Limitor®-P HV fuse ensure straightforward installation into existing switchgear configurations without the need for any modifications, simplifying maintenance and upgrade processes.
  • Rated for 12 kVAC operation per IEC 60282-1
  • 4A current rating with 80N striker for fault indication
  • Ceramic body with pure silver fuse elements and silver-coated copper caps
  • Dimensions: 56mm diameter x 292mm length for DIN back-up fuse compatibility
  • VDE T4 certified for transformer protection applications

Specifications

AC Voltage Rating
12 kV
Amperage Rating
4 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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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.