Mersen A1018325 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T402 24kVAC IEC 100A d88mm, L442mm With Thermal Striker 80N Low power losses
Mersen

A1018325

Alternate Item Number: 45DB240V100PTS

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Overview

Mersen Limitor® VDE T402 24kVAC 100A high-voltage backup fuse (SKU: A1018325) delivers reliable short-circuit protection for transformers in air or gas-insulated switchgear. Engineered with pure silver fuse-elements, silver-coated copper caps, and a high-purity ceramic body, this fuse ensures exceptional thermal stability and low power dissipation (13 mΩ, 220W at 100A). The integrated thermal striker (80N) activates at overheating to prevent damage to switchgear compartments, a critical safety feature for high-voltage systems. Siemens and Ormazabal specify Limitor®-PTS fuses for their gas-insulated switchgear, underscoring Mersen’s industry trust. With a breaking capacity of 63kA and clearing I²t of 200 kA²s, this fuse handles extreme fault currents while maintaining precise coordination with transformer protection schemes. The 24kVAC rating and 100A continuous current make it ideal for medium-voltage transformer applications, offering a compact d88mm x L442mm footprint for DIN rail mounting. Certified to IEC 60282-1 and VDE T402 standards, the Limitor® VDE T402 series combines decades of Mersen innovation with field-proven reliability in utility, industrial, and renewable energy substations. The fuse’s high-purity silica ceramic body withstands thermal cycling and dielectric stress, while the silver-coated copper caps ensure low contact resistance and corrosion resistance. Designed for compliance with IEC 62271-200 and IEEE C37.46, it supports arc flash mitigation in medium-voltage switchgear. The fuse’s thermal striker mechanism operates independently of external relays, providing fail-safe protection against internal faults. With a rated voltage of 24kV and maximum system voltage of 25.8kV, it is suitable for applications in power distribution networks, including wind farms and solar substations. The fuse’s dimensions (d88mm x L442mm) allow for integration into standard DIN rail mounting systems, facilitating easy installation and maintenance in compact switchgear assemblies.
  • 24kVAC rated voltage, 100A continuous current for transformer protection
  • Pure silver fuse-elements and silver-coated copper caps for low resistance (13 mΩ)
  • Thermal striker (80N) prevents overheating in switchgear compartments
  • 63kA breaking capacity, 200 kA²s clearing I²t for extreme fault currents
  • Ceramic body, d88mm x L442mm, DIN rail compatible

Specifications

AC Voltage Rating
24 kV
Amperage Rating
100 A
Application
Best used in SF6 insulated switch gear and compact switch gear HV Transformer protection
Body Material
Ceramic
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Silver-Plated Copper
Interrupt Rating
65 kA
Mounting
Clip
Size
20 x 3.46 in
Size
508 x 88 mm
Special Features
Low switching voltage Large current ratings range Very low power losses Energy efficency New thermal striker patented by Mersen to prevent overheating Medium striker 80N / 30mm New cap design for a better compatibility with all types of clips and easier assembly Outdoor and indoor use Coordination with IEC 60787, IEC 62271-105 and VDE 0670 T303
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)
20 in x 3.46 in x 3.46 in
Package Dimensions (L x W x H)
508 mm x 88 mm x 88 mm
Package Weight (Imperial)
13.448 lb
Package Weight (Metric)
6.100 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.

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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.