Mersen N078166 - High Voltage Back-up fuse for motor Limitor® 7.2kVAC IEC 100A d50,8mm L292mm With Striker 50N
Mersen

N078166

Alternate Item Number: 45ASB72V100P-2


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Overview

The Mersen N078166 is a high-voltage back-up fuse specifically designed for motor protection within 7.2kVAC IEC systems. For decades, Mersen HV fuse-links have provided reliable protection in high-voltage switchgear, controlgear, and power systems. This fuse is engineered to safeguard HV motors against short-circuit currents and to withstand the repeated peak currents generated during motor starting sequences. Constructed with premium materials, it features fuse elements made of pure silver, caps of silver-plated brass, and a body constructed from melamine fiberglass. As defined by IEC 60644, the coefficient K for this fuse is 0.51. Key specifications include a rated voltage of 7.2kVAC, a rated current of 100A, a minimum breaking current of 500A, and an operating I²t of 78 kA²s. The fuse has a power dissipation of 30W at 0.7xIn and a striker force of 50N. Its dimensions are a diameter of 50.8mm and a length of 292mm. The country of origin is the US. This fuse is part of the Limitor® aSJB/D series, offering robust protection for critical motor applications.
  • Designed for high-voltage motor protection (7.2kVAC IEC)
  • 100A rated current with 500A minimum breaking current
  • Features a 50N striker for trip indication
  • Constructed with pure silver fuse elements and silver-plated brass caps
  • Meets IEC 60644 standards with K coefficient of 0.51

Specifications

AC Voltage Rating
7.2 kV
Amperage Rating
100 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
Current Rating
100 A
Interrupt Rating
50 kA
Material
Pure silver, silver-plated brass, melamine fiber glass
Mounting
Clip
Series
Limitor®
Size
d50.8mm L292mm
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
Voltage Rating
7.2 kVAC
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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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.