Mersen W1032949 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T402 12kVAC IEC 31.5A d56mm, L292mm With Thermal Striker 80N Low power losses
Mersen

W1032949

Alternate Item Number: 45DB120V32PTS2

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Overview

The Mersen W1032949 is a high-voltage DIN back-up fuse designed for transformer protection in 6/12 kV systems, compliant with IEC and VDE T402 standards. This 31.5A fuse-link features a ceramic body, pure silver fuse elements, and copper caps with silver plating for superior conductivity and corrosion resistance. The integrated thermal striker (80N) activates at 45DB175V32PT to prevent overheating in switchgear compartments, ensuring safety and reliability. With a breaking capacity of 65 kA and clearing I²t of 7,000 A²s, it handles severe fault conditions while maintaining low power dissipation of 39W at rated current. The fuse’s compact 56mm diameter and 292mm length make it compatible with standard DIN rail mountings and gas-insulated switchgear from Siemens and Ormazabal. Cold resistance is 30 mΩ (±10%), and the package weight is 1.6 kg. Ideal for transformer protection in utility, industrial, and renewable energy applications, this fuse-link delivers precise fault interruption with minimal energy loss, reducing operational costs and downtime. Certified for global markets, it meets rigorous electrical and thermal performance requirements. The fuse is specifically designed for transformer limitor applications.
  • 31.5A rated current for transformer protection in 6/12 kV systems
  • Thermal striker (80N) prevents overheating in switchgear compartments
  • Breaking capacity: 65 kA; Clearing I²t: 7,000 A²s
  • Low power dissipation: 39W at rated current; Cold resistance: 30 mΩ
  • Ceramic body, pure silver fuse elements, and silver-plated copper caps for durability
  • Compact 56mm x 292mm dimensions; Compatible with Siemens and Ormazabal switchgear
  • Compliant with IEC and VDE T402 standards

Specifications

AC Voltage Rating
12 kV
Amperage Rating
31.5 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
Connection Type
DIN Back-up fuse
Current Rating
31.5 A
Interrupt Rating
65 kA
Material
Ceramic, Silver, Copper
Mounting
Clip
Mounting Type
Fuse-link
Series
Limitor®-PTS
Size
14.09 x 2.2 in
Size
358 x 56 mm
Size
d56mm, L292mm
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
Voltage Rating
12 kVAC
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)
3.527 lb
Package Weight (Metric)
1.600 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.