Mersen M076486 - High Voltage Back-up fuse for motor Limitor® 12kVAC IEC 250A d88mm, L442mm With Striker 50N
Mersen

M076486

Alternate Item Number: 45ASB120V250P-3


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Specification Sheet

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Overview

The Mersen M076486 is a Limitor® high-voltage back-up fuse designed for reliable short-circuit protection of 12kVAC motors in industrial switchgear. Rated at 250A, this fuse features a 88mm diameter and a length of 442mm, adhering to IEC standards. It incorporates a 50N striker for clear fault indication. Constructed with pure silver fuse elements, silver-plated brass caps, and a melamine fiberglass body, it ensures durability and consistent performance. The fuse meets IEC 60644 and is engineered to handle repeated peak currents during motor starts. Its K coefficient of 0.51 guarantees stable operation under high inrush conditions. With a minimum breaking current of 1750A and a power dissipation of 37W at 0.7xIn, it provides precise thermal management. The operating I²t at rated voltage is 1700 kA²s, supporting a breaking capacity of 31.5kA. This fuse is ideal for critical HV motor protection in power generation, mining, and heavy industrial sectors where dependable fault interruption is essential. SKU: M076486.
  • 12kVAC Voltage Rating
  • 250A Current Rating
  • 88mm Diameter, 442mm Length
  • Pure Silver Fuse Elements
  • 50N Striker for Fault Indication

Specifications

AC Voltage Rating
12 kV
Amperage Rating
250 A
Application
HV motor protection HV motor pump protection For indoor use Operating temperature -25°C to +40°C
Body Material
Melamine fiber glass
Brand Name
Mersen
Connection
Cylindrical
Connection Material
Silver-Plated Brass
Interrupt Rating
50 kA
Mounting
Clip
Size
20 x 3.46 in
Size
508 x 88 mm
Special Features
High speed switching Voltage drive Low inductance module structure Energy efficency Back-up fuse-links High breaking capacity High current limitation Low power losses Striker 50N / 30mm
Standard
IEC 60282-1 IEC 60644 DIN 43625
Sub Brand
Limitor®
Type
DIN HV Back-up Fuses for Motors
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.