Mersen A051F1DHR0-9R - Back-Up R-Rated Medium Voltage Fuse 5080VAC 9R Mounting: Ferrule Style: DHR0 Visual Indicator Amp-Trap®
Mersen

A051F1DHR0-9R

Alternate Item Number: A051F1DHR0-9R

UPC: 782001499822

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Overview

The Mersen Amp-Trap® A051F1DHR0-9R is a current-limiting, high-interrupting medium voltage fuse designed for short circuit protection in motor and motor controller applications. Rated at 5080VAC and 9R, this back-up fuse provides a minimum interrupting rating of 50 kA RMS symmetrical, ensuring reliable performance in medium voltage systems up to 5080 volts AC. The DHR0 size fuse features a ferrule mounting style with a 3-inch diameter barrel and spring-reinforced clips for secure installation, accommodating conductor sizes from 1/0 AWG to 4/0 AWG. These fuses are engineered for use in combination motor starters, where coordination with overload relays is required to protect motors from short circuits while allowing normal overload conditions without nuisance tripping. The Amp-Trap® series is manufactured in the US and includes a visual indicator for easy status verification, with a bright red indicator that activates upon fuse operation. Typical applications include medium voltage motors in industrial, commercial, and utility settings where high fault currents are a concern, such as in pumps, fans, compressors, and conveyors. The 9R rating indicates the fuse's interrupting capacity and coordination class, making it suitable for protecting motors up to the specified voltage and current levels while maintaining selective coordination with downstream protective devices. The fuse meets or exceeds industry standards including UL 198M and ANSI C37.46, ensuring compliance with safety and performance requirements. Always follow the motor starter manufacturer's specified fuse size for proper coordination and system protection, as improper selection can lead to equipment damage or safety hazards. The A051F1DHR0-9R is part of Mersen's comprehensive medium voltage fuse portfolio, which is designed to provide superior protection and reliability in demanding electrical environments.
  • 5080VAC voltage rating for medium voltage applications
  • 9R interrupting rating for short circuit protection in motors
  • DHR0 size with ferrule mounting for secure installation
  • Visual indicator for easy status verification
  • Designed for coordination with overload relays in motor starters

Specifications

AC Voltage Rating
5080 V
Application
Short circuit protection of medium voltage motors and motor controllers
Body Material
Epoxy
Brand Name
Mersen
Color
Red
Connection
Ferrule
Connection Material
Silver-Plated Copper
Connection Type
Ferrule
Current Rating
9R
Frequency
60 Hz
Interrupt Rating
50 kA
Material
Metal (ferrule), Ceramic/Glass (barrel)
Mounting
Clip
Mounting Type
Ferrule mount with spring-reinforced clips
Series
Amp-Trap®
Size
15.88 x 3 in
Size
403.352 x 76.2 mm
Size
DHR0 (3-inch diameter barrel)
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)
15.88 in x 3 in x 4.55 in
Package Dimensions (L x W x H)
403.352 mm x 76.2 mm x 115.57 mm
Package Weight (Imperial)
11.200 lb
Package Weight (Metric)
5.080 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.