Mersen A055F2D0R0-400E - Medium Voltage E-Rated Fuse 5500VAC 400A Ferrule, Series: D0R0 Visual Indicator Amp-Trap®
Mersen

A055F2D0R0-400E

Alternate Item Number: 782001804312

UPC: 782001804312


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Overview

The Mersen A055F2D0R0-400E is a medium-voltage E-Rated fuse designed for overload and short-circuit protection in transformers and distribution lines. Rated at 5500VAC and 400A, this current-limiting fuse melts at currents as low as 1.7 times its rated current, up to its maximum interrupting rating. It withstands transformer magnetizing inrush current, ensuring reliable operation during startup transients. The fuse features a 2x3 inch (size DD) barrel with ferrule connections, mounted in spring-reinforced clips for secure retention. Part of the D0R0 series, it is ideal for industrial and utility applications requiring high interrupting capacity and precise fault protection. The ferrule design ensures compatibility with standard fuse holders, while the visual indicator provides clear fault indication. This fuse is manufactured in the US and meets UNSPSC code 39121626 for medium-voltage protective devices. Mersen, a global expert in electrical power and safety, manufactures this fuse to exacting standards for dependable performance in critical infrastructure.
  • Medium Voltage E-Rated Fuse
  • 5500VAC, 400A Rating
  • Size DD (2x3 inch) Ferrule
  • Visual Indicator for Fault Indication
  • Transformer and Distribution Line Protection
  • Designed to withstand transformer magnetizing inrush current
  • Part of Mersen's D0R0 series for distribution line protection

Specifications

AC Voltage Rating
5500 V
Amperage Rating
400 A
Application
Protection for up to 5.5 kV transformers or distribution systems.
Body Material
PolyTube
Brand Name
Mersen
Connection
Ferrule
Connection Material
Silver-Plated Copper
Connection Type
Ferrule
Current Rating
400 A
Interrupt Rating
63 kA
Mounting
Clip
Mounting Type
Spring-reinforced clips
Series
D0R0
Size
DD (2x3")
Size
2x3 inch (size DD)
Size
15.88 x 3 x 6.63 in
Size
403.352 x 76.2 x 168.402 mm
Special Features
Amp-Trap CS-3 and 9F62 series are UL listed for compatibility with UL listed equipment Ferrule mounting for standard clips and interchangeability with other brands of fuses Current-limiting for superior equipment protection Non-venting for silent operation Metal embossed catalog number and manufacturing date for lasting identification Outdoor usage for the 9F62 and 9F60 type EJO Blown-fuse indicator to give positive identification of open fuse: Amp-Trap: 2" Barrel 1 lb tripped force - 0.19 Inch Amp-Trap: 3" Barrel 2 lb tripped force - 0.50 Inch 9F60/9F62: 0.125 lb tripped force – 0.20 Inch
Standard
Some UL listed to standard File E143362
Sub Brand
Amp-Trap®
Type
General Purpose Ferrule Mount Fuses for Transformer Protection
Type Of Indicators
Visual Indicator
Voltage Rating
5500 VAC
Package Dimensions (L x W x H)
15.88 in x 3 in x 6.63 in
Package Dimensions (L x W x H)
403.352 mm x 76.2 mm x 168.402 mm
Package Weight (Imperial)
20.000 lb
Package Weight (Metric)
9.072 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.

LCC5

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.