Mersen A051B1DHR0-5R - Back-Up R-Rated Medium Voltage Fuse 5080VAC 5R Mounting: Bolted Style: DHR0 Visual Indicator Amp-Trap®
Mersen

A051B1DHR0-5R

Alternate Item Number: A051B1DHR0-5R

UPC: 782001501419


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Overview

The Mersen A051B1DHR0-5R is a current-limiting, back-up R-Rated medium voltage fuse designed for short circuit protection in medium voltage motors and motor controllers. This fuse features a 5.08kV (5080VAC) rating and a 5R mounting configuration with a bolted style (DHR0) for direct attachment to equipment bus or terminal pads. R-Rated fuses are critical in combination motor starters, requiring coordination with overload relays to ensure optimal system protection. The manufacturer specifies the appropriate R-Rated fuse size for each application, with this model providing a continuous amp rating of 150A at 40°C and a minimum interrupting current of 450A RMS symmetrical. This single barrel fuse has a 3-inch diameter and end mounts for secure, direct connections. It includes a visual indicator for operational status, providing positive identification of an open fuse with a tripped force of 0.44 inches. The A051B1DHR0-5R is UL Recognized and manufactured in the US, ensuring compliance with industry standards. The metal embossed catalog number and manufacturing date provide lasting identification for traceability and maintenance tracking. Ideal for protecting medium voltage motors and controllers in industrial environments, this fuse is commonly used in motor control centers (MCCs) and Ampgard Switchgear. The bolt-in mounting design allows for direct connection to bus or terminals, eliminating the need for additional adapters or mounting hardware. With a maximum interrupting rating of 50kA at 5.08kV, the A051B1DHR0-5R delivers reliable short circuit protection in demanding applications up to 5.08kV AC. Available with or without indication by substituting 'DHR0' with 'DHRN' in the part number, offering flexibility for different installation requirements.
  • 5.08kV (5080VAC) rated for medium voltage applications
  • 150A continuous amp rating at 40°C with 450A minimum interrupting current
  • Bolted DHR0 style with 3-inch diameter single barrel design
  • UL Recognized with visual indicator for blown-fuse identification
  • 50kA maximum interrupting rating at 5.08kV for superior short circuit protection

Specifications

AC Voltage Rating
5080 V
Application
Short circuit protection of medium voltage motors and motor controllers
Body Material
GMG
Brand Name
Mersen
Connection
Bolted
Connection Material
Silver-Plated Copper
Connection Type
Bolted
Current Rating
5R
Interrupt Rating
50 kA
Mounting
Bolted
Mounting Type
Bolted Style DHR0
Mounting Type
Bolted (DHR0)
Mounting Type
Bolted Style (DHR0)
Mounting Type
Bolted
Series
Amp-Trap®
Size
19.19 x 3 in
Size
487.426 x 76.2 mm
Size
3-inch diameter
Special Features
The Amp-Trap Bolt-in series are UL Recognized Bolt-in mounting for direct connection to bus or terminals Current-limiting for superior equipment protection Metal embossed catalog number and manufacturing date for lasting identification Blown-fuse indicator to give positive identification of open fuse Amp-Trap: 3" Barrel 2 lb tripped force - 0.50 Inch
Standard
UL Recognized File E93367
Sub Brand
Amp-Trap®
Type
Back-Up R-Rated Bolt-On Fuses for Motor Protection
Type Of Indicators
Visual Indicator
Voltage Rating
5080 VAC
Package Dimensions (L x W x H)
19.19 in x 3.67 in x 3 in
Package Dimensions (L x W x H)
487.426 mm x 93.218 mm x 76.2 mm
Package Weight (Imperial)
12.000 lb
Package Weight (Metric)
5.443 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.