Mersen T1032947 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T402 12kVAC IEC 20A d56mm, L292mm With Thermal Striker 80N Low power losses
Mersen

T1032947

Alternate Item Number: 45DB120V20PTS2

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Overview

The Mersen Limitor®-PTS T1032947 is a high-voltage DIN back-up fuse specifically engineered for robust transformer protection within 12kVAC electrical systems. This fuse boasts a significant breaking capacity of 65kA, ensuring effective interruption of fault currents. A key safety feature is its integrated thermal striker, calibrated to activate at 80 Newtons, which provides an additional layer of protection by preventing overheating within switchgear compartments. The internal fuse element is meticulously crafted from pure silver, a material chosen for its exceptional electrical conductivity, thereby minimizing resistance and power loss. Complementing the silver fuse element, the fuse caps are silver-coated copper, and the fuse body is constructed from high-strength ceramic, a material selected for its inherent durability and ability to withstand the stresses of high-voltage applications. The T1032947 exhibits a low cold resistance of just 51 milliohms. At its rated current of 20A, the fuse dissipates a minimal 25 Watts of power, underscoring its design for low power losses. This efficiency in energy management is crucial for maintaining optimal operating temperatures and reducing overall energy consumption. The fuse adheres to the stringent VDE 0670 T402 standards, a testament to its quality and performance. Its reliability and effectiveness have led to its recommendation by leading manufacturers such as Siemens and Ormazabal for integration into their advanced gas-insulated switchgear. The primary advantages of the T1032947 include its substantial breaking capacity, the crucial safety function of the thermal striker, and its remarkably low power losses. Its physical dimensions, a diameter of 56mm and a length of 292mm, are optimized for standard DIN mounting, facilitating straightforward installation in a variety of switchgear configurations. This fuse is an ideal solution for critical transformer protection applications across both industrial and utility power distribution networks.
  • Rated voltage: 12 kVAC, current: 20 A
  • Breaking capacity: 65 kA, clearing I²t: 4700 A²s
  • Thermal striker (80N) prevents overheating in switchgear
  • Low power dissipation: 25 W at rated current
  • Ceramic body with silver-coated copper caps and pure silver fuse-element
  • DIN mounting, dimensions: Ø56mm x L292mm
  • Compliant with VDE 0670 T402, recommended by Siemens & Ormazabal

Specifications

AC Voltage Rating
12 kV
Amperage Rating
20 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
14.09 x 2.2 in
Size
358 x 56 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)
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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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.