Mersen 9F60LJD506 - Back-Up R-Rated Medium Voltage Fuse 5080VAC 6R Mounting: Ferrule Style: LJD Visual Indicator Amp-Trap®
Mersen

9F60LJD506

Alternate Item Number: 9F60LJD506

UPC: 782001396206


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Overview

The Mersen 9F60LJD506 is a current-limiting, high-interrupting R-Rated back-up fuse designed for short-circuit protection in medium voltage motors and motor controllers. Rated at 5080VAC, this fuse is engineered for combination motor starters where coordination with overload relays is required. The 9F60LJD506 features a ferrule-style mounting for secure installation in spring-reinforced clips, available in 3-inch (size D) or 4-inch (size E) barrel diameters. The Amp-Trap® visual indicator provides clear fault indication, enabling quick troubleshooting. These fuses are specified by motor starter manufacturers to ensure optimal protection and compliance with industry standards. The fuse is manufactured in the US and carries the UNSPSC code 39121626. Ideal for industrial applications requiring reliable, high-performance short-circuit protection in medium voltage systems. Key specifications include a continuous amp rating of 170 at 40°C, a minimum interrupting rating of 580 RMS amps, and a single-barrel design. The 9F60LJD506 is UL Recognized and features a metal-embossed catalog number and manufacturing date for lasting identification. The bolt-in mounting design allows for direct connection to bus or terminals, ensuring secure and stable installation. The fuse is part of Mersen's Amp-Trap® series, known for current-limiting performance and superior equipment protection. Applications include medium voltage motors, motor control centers (MCCs), and industrial systems requiring precise short-circuit protection. The 3-inch diameter barrel (size D) is designed for 12-inch (305 mm) clip centers, making it compatible with standard MCC configurations.
  • R-Rated back-up fuse for short-circuit protection in medium voltage motors and motor controllers
  • Rated at 5080VAC with a continuous amp rating of 170 at 40°C
  • Ferrule-style mounting for secure installation in spring-reinforced clips (3-inch barrel)
  • Amp-Trap® visual indicator for clear fault identification and quick troubleshooting
  • UL Recognized with metal-embossed catalog number and manufacturing date for traceability

Specifications

AC Voltage Rating
5080 V
Amperage Rating
6 R
Application
Short circuit protection of medium voltage motors and motor controllers
Body Material
Epoxy
Brand Name
Mersen
Connection
Ferrule
Connection Material
Silver-Plated Copper
Connection Type
Ferrule
Current Rating
6R
Current Rating
6 A
Family Code
142
Family Description
Med Voltage R Rated
Interrupt Rating
50 kA
Material
clips
Mounting
Clip
Mounting Type
Ferrule-style
Mounting Type
Ferrule mount
Mounting Type
Ferrule
Mounting Type
Spring reinforced clips
Mounting Type
Spring-reinforced clips
Mounting Type
Ferrule-style mounting in spring-reinforced clips
Response Time
R-Rated
Series
LJD
Series
Amp-Trap®
Series
LJD Visual Indicator Amp-Trap®
Size
3" (size D) or 4" (size E)
Size
D (3") or E (4")
Size
Size D (3-inch) or Size E (4-inch diameter barrel)
Size
3‑inch (size D) / 4‑inch (size E)
Size
3-inch (size D) or 4-inch (size E)
Size
Size D
Size
15.97 x 3 in
Size
405.638 x 76.2 mm
Special Features
The Amp-Trap and 9F60 R-Rated fuses are UL Recognized Ferrule mounting for standard clips and interchangeability with other brands of fuses Current-limiting for superior equipment protection Metal embossed catalog number and manufacturing date for lasting identification Hookeye for non load-break isolation by hookstick: On the 4.8kV an optional hookeye mounted in the factory is available On all other 3" barrels if a hookeye is required, use the operating eye 9F61AAW612 Blown-fuse indicator to give positive identification of open fuse Amp trap: 3" Barrel 2 lb tripped force - 0.50 Inch 9F60: 0.125 lb tripped force – 0.20 Inch
Standard
Amp-Trap: UL File E93367 9F60: UL File E191980
Sub Brand
Amp-Trap®
Type
Back-Up R-Rated Ferrule Mount Fuses for Motor Protection
Type Of Indicators
Visual Indicator
Voltage Rating
5080 VAC
Package Dimensions (L x W x H)
15.97 in x 3 in x 3 in
Package Dimensions (L x W x H)
405.638 mm x 76.2 mm x 76.2 mm
Package Weight (Imperial)
8.000 lb
Package Weight (Metric)
3.629 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.
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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.