Mersen L078164 - High Voltage Back-up fuse for motor Limitor® 7.2kVAC IEC 63A d50,8mm L292mm With Striker 50N
Mersen

L078164

Alternate Item Number: 45ASB72V63P-2


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Overview

Mersen Limitor® L078164 is a high-voltage backup fuse designed for reliable motor protection in industrial applications. Rated at 7.2kV AC, this fuse provides robust short-circuit protection for high-voltage motors, supporting repeated peak currents during motor starting. The fuse features a pure silver fuse element for superior conductivity and durability, silver-plated brass caps for corrosion resistance, and a melamine fiberglass body for high mechanical strength and thermal stability. Compliance with IEC 60644 ensures a K coefficient of 0.51, meeting stringent international standards for high-voltage fuse-links. The 50N striker provides visual and mechanical indication of fuse operation, enabling quick fault identification. With a rated current of 63A and a minimum breaking current of 315A, the L078164 is suitable for demanding motor protection applications in switchgear and controlgear systems. The compact 50.8mm diameter and 292mm length design allows for easy integration into existing high-voltage systems. Manufactured in the USA by Mersen, a leader in electrical protection solutions, this fuse combines reliability, precision, and long service life for critical industrial environments.
  • Rated voltage: 7.2kV AC
  • Rated current: 63A
  • Minimum breaking current: 315A
  • Striker force: 50N for fault indication
  • Body material: Melamine fiberglass for high mechanical strength
  • Fuse element: Pure silver for superior conductivity
  • Caps: Silver-plated brass for corrosion resistance
  • Compliance: IEC 60644 (K coefficient 0.51)
  • Dimensions: 50.8mm diameter, 292mm length
  • Country of origin: USA

Specifications

AC Voltage Rating
7.2 kV
Amperage Rating
63 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
14.09 x 2 in
Size
358 x 50.8 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)
14.09 in x 2 in x 2 in
Package Dimensions (L x W x H)
358 mm x 50.8 mm x 50.8 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.