Mersen Y1014919 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T4 12kVAC IEC 250A d88mm, L292mm With Striker Standard 80N
Mersen

Y1014919

Alternate Item Number: 45DB120V250P

Contact for Pricing

Overview

The Mersen Limitor®-P Y1014919 is a high-voltage DIN back-up fuse designed for transformer protection in medium-voltage switchgear and controlgear systems. Rated at 12kV AC (IEC standard) with a 250A nominal current, this fuse provides reliable short-circuit protection for transformers by interrupting fault currents up to 63kA. The Y1014919 features a ceramic body for high dielectric strength, pure silver fuse elements for consistent performance, and copper caps silver-plated for corrosion resistance. With a cold resistance of 3.7 mΩ and power dissipation of 335W at rated current, this fuse ensures minimal energy loss while maintaining thermal stability. The standard 80N striker pin provides visual or remote indication of fuse operation, enabling quick fault identification in critical applications. Designed for DIN rail mounting (L292mm x Ø88mm), the Y1014919 weighs 3.7kg and meets IEC 60282-1 standards for back-up fuse applications. Its clearing I²t rating of 654 kA²s ensures rapid response to fault conditions, protecting transformers from damage due to overcurrent. The fuse is manufactured in the US by Mersen, a leader in high-voltage protection solutions with decades of experience in industrial and utility applications. Applications include protection of distribution transformers in substations, industrial power systems, renewable energy installations, and commercial buildings where high-voltage fault protection is critical. The Y1014919 is ideal for systems requiring compliance with VDE 0670 T4 and IEC standards, offering a balance of performance, durability, and safety in high-voltage environments.
  • 250A rated current for transformer protection
  • 12kV AC rated voltage (IEC standard)
  • 63kA breaking capacity for high fault currents
  • Ceramic body with pure silver fuse elements for reliability
  • Standard 80N striker for fault indication

Specifications

AC Voltage Rating
12 kV
Amperage Rating
250 A
Application
HV Transformer protection
Body Material
Ceramic
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Silver-Plated Copper
Current Rating
250 A
Interrupt Rating
63 kA
Material
Ceramic, Silver, Copper
Mounting
Clip
Series
Limitor® VDE T4
Size
14.09 x 3.46 in
Size
358 x 88 mm
Size
d88mm, L292mm
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
Voltage Rating
12 kVAC
Package Dimensions (L x W x H)
14.09 in x 3.46 in x 3.46 in
Package Dimensions (L x W x H)
358 mm x 88 mm x 88 mm
Package Weight (Imperial)
8.157 lb
Package Weight (Metric)
3.700 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.