Mersen J1000255 - High Voltage DIN Back-up fuse for Transformer Limitor® VDE T402 24kVAC IEC 20A d56mm, L442mm With Striker 80N
Mersen

J1000255

Alternate Item Number: 45DB240V20PD

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Overview

The Mersen J1000255 is a high-voltage (HV) back-up fuse from the Limitor®-PD HV series, specifically designed for reliable transformer protection against short-circuit currents. Engineered to meet stringent industry standards, this fuse conforms to IEC 60282-1 and VDE 0670 T402 specifications. It operates at a voltage rating of 24 kVAC and a current rating of 20 A, making it suitable for demanding electrical systems. The physical dimensions are a diameter of 56mm and a length of 442mm, ensuring compatibility with standard switchgear and controlgear. This model includes a striker mechanism, providing an additional signaling function upon operation. Mersen prioritizes quality by utilizing premium materials: fuse elements are constructed from pure silver, end caps are silver-coated copper, and the body is made from durable ceramic. These material choices contribute to the fuse's consistent performance and longevity in high-voltage applications. The Limitor®-PD HV range, as defined by VDE 0670 T402, covers fuse ratings from 6.3A to 160A. For ratings outside this specific range, consult the Mersen Limitor®-P HV fuse range. With decades of proven reliability in high-voltage systems, Mersen HV fuse-links are a trusted choice for safeguarding critical infrastructure. SKU: J1000255. Manufacturer: Mersen. UNSPSC Code: 39121626. Country of Origin: US.
  • High-voltage back-up fuse for transformer protection
  • 24 kVAC voltage rating, 20 A current rating
  • Conforms to IEC 60282-1 and VDE 0670 T402 standards
  • Durable construction with silver, copper, and ceramic materials
  • Includes striker mechanism for signaling

Specifications

AC Voltage Rating
24 kV
Amperage Rating
20 A
Application
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 2.2 in
Size
508 x 56 mm
Special Features
High breaking capacity High current limitation Low switching voltage Quick breaking medium striker 80N/30mm 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 Indoor and outdoor applications
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 2.2 in x 2.2 in
Package Dimensions (L x W x H)
508 mm x 56 mm x 56 mm
Package Weight (Imperial)
5.291 lb
Package Weight (Metric)
2.400 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.

LCC5

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.