Mersen A051B2DHR0-24R - Back-Up R-Rated Medium Voltage Fuse 5080VAC 24R Mounting: Bolted Style: DHR0 Visual Indicator Amp-Trap®
Mersen

A051B2DHR0-24R

Alternate Item Number: A051B2DHR0-24R

UPC: 782001501365


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Overview

The Mersen A051B2DHR0-24R is an R-Rated, current-limiting back-up fuse engineered for short circuit protection of medium voltage motors and motor controllers operating at 5080VAC. This fuse is rated at 24R and features a bolted mounting style (DHR0) with a visual indicator (Amp-Trap®). R-Rated fuses are not standalone devices; they must be coordinated with overload relays in combination motor starters, as specified by the motor starter manufacturer. These fuses are available in single, double, triple, or quadruple barrel configurations with a 3-inch diameter and end mounts for direct bolting to equipment bus or terminal pads. The Amp-Trap® design ensures reliable fault detection and interruption, protecting critical motor control systems from damaging short circuits. Suitable for industrial applications where medium voltage motors require precise overcurrent protection. The A051B2DHR0-24R offers a continuous amp rating of 450A at 40°C and a minimum interrupting rating of 2200A RMS, with a maximum interrupting rating of 50kA RMS at 5.08kV. UL Recognized, this fuse is designed for use in medium voltage motor protection systems, including motor control centers (MCCs) and switchgear. The bolt-in mounting style ensures secure mechanical connection in blast-proof equipment, making it ideal for harsh industrial environments. The visual indicator provides positive identification of an open fuse, reducing downtime and maintenance costs. Compatible with Ampgard Switchgear and other MCCs, this fuse is a reliable solution for short circuit protection in medium voltage applications.
  • R-Rated current-limiting back-up fuse for medium voltage motors and motor controllers
  • 5080VAC rated, 24R amp rating, 450A continuous amp rating at 40°C
  • Bolted mounting style (DHR0) with 3-inch diameter and end mounts for direct bolting
  • Minimum interrupting rating of 2200A RMS, maximum interrupting rating of 50kA RMS at 5.08kV
  • Amp-Trap® visual indicator for positive identification of open fuse

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
24R
Interrupt Rating
50 kA
Material
Amp-Trap®
Mounting
Bolted
Mounting Type
End Mounts for Direct Bolting
Mounting Type
Bolted
Series
A051B2DHR0
Series
Amp-Trap®
Size
19.19 x 3 x 6.98 in
Size
487.426 x 76.2 x 177.292 mm
Size
3 inch diameter
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
5080VAC
Package Dimensions (L x W x H)
19.19 in x 3 in x 6.98 in
Package Dimensions (L x W x H)
487.426 mm x 76.2 mm x 177.292 mm
Package Weight (Imperial)
23.000 lb
Package Weight (Metric)
10.433 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.