Mersen A155B4D0R0-38X - Back-Up R-Rated Medium Voltage Fuse 15500VAC 38X Mounting: Bolted Style: D0R0 Visual Indicator Amp-Trap®
Mersen

A155B4D0R0-38X

Alternate Item Number: A155B4D0R0-38X

UPC: 782001374358


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Overview

The Mersen A155B4D0R0-38X is a critical component for the short circuit protection of medium voltage motors and motor controllers. As a current-limiting, high interrupting rating fuse, it is specifically designed for R-Rated applications. These fuses function as back-up protection, requiring coordination with overload relays within combination motor starters. The motor starter manufacturer typically specifies the appropriate R-Rated fuse size. This particular model features a 3-inch diameter barrel with end mounts designed for direct bolting to equipment bus or terminal pads, ensuring a secure and reliable connection. Manufactured by Mersen, a trusted name in electrical protection, the A155B4D0R0-38X offers robust performance for demanding industrial environments. Its construction and ratings are tailored for medium voltage systems, providing essential protection against damaging short circuits. The visual indicator on this Amp-Trap® fuse allows for quick and easy identification of blown fuses, minimizing downtime during maintenance or troubleshooting. Originating from the US, this fuse adheres to stringent manufacturing standards.
  • Back-Up R-Rated Medium Voltage Fuse
  • 15500VAC, 38X Bolted Mounting Style
  • Current-limiting with high interrupting rating
  • Designed for motor and motor controller protection
  • Features Amp-Trap® technology with visual indicator

Specifications

AC Voltage Rating
15500 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
Interrupt Rating
50 kA
Mounting
Bolted
Mounting Type
Bolted to equipment bus or terminal pads
Series
D0R0
Size
25.1 x 7 x 11.63 in
Size
637.54 x 177.8 x 295.402 mm
Size
3 inches 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
15500VAC
Package Dimensions (L x W x H)
25.1 in x 7 in x 11.63 in
Package Dimensions (L x W x H)
637.54 mm x 177.8 mm x 295.402 mm
Package Weight (Imperial)
57.000 lb
Package Weight (Metric)
25.855 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.