Mersen A155B3D0R0-24X - Back-Up R-Rated Medium Voltage Fuse 15500VAC 24X Mounting: Bolted Style: D0R0 Visual Indicator Amp-Trap®
Mersen

A155B3D0R0-24X

Alternate Item Number: A155B3D0R0-24X

UPC: 782001374334


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Overview

The Mersen A155B3D0R0-24X is an R-Rated, current-limiting backup fuse engineered for short circuit protection in medium voltage motor and motor controller applications. Rated for 15,500VAC and 15.5kV system voltage, this fuse delivers a high interrupting rating of 40kA RMS symmetrical at 15.5kV, ensuring robust fault current interruption. The bolted mounting style provides a secure installation directly to equipment bus or terminal pads, eliminating the need for additional mounting hardware. The D0R0 barrel design features a 3-inch diameter, accommodating single, double, triple, or quadruple barrel configurations for flexible installation options. Equipped with a visual indicator, the A155B3D0R0-24X enables quick status verification without disassembly, reducing downtime during maintenance checks. These fuses must be coordinated with overload relays in combination motor starters, as specified by the motor starter manufacturer, to ensure proper protection and compliance with industry standards. Designed for industrial environments, the A155B3D0R0-24X provides reliable short circuit protection in medium voltage systems up to 15.5kV, making it ideal for critical applications where equipment safety and operational continuity are paramount.
  • R-Rated current-limiting backup fuse for short circuit protection
  • Rated for 15,500VAC with high interrupting capacity
  • Bolted mounting style for direct installation to bus or terminal pads
  • D0R0 barrel design (3 inches diameter) supports single/double/triple/quadruple barrel configurations
  • Visual indicator for quick status verification without disassembly

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
Bolt-on
Mounting Type
Bolted
Mounting Type
Bolted to equipment bus or terminal pads
Series
Amp-Trap®
Series
Amp-Trap® R-Rated
Series
Amp-Trap® A155B3D0R0
Size
25.1 x 3 x 11.63;637.54 x 76.2 x 295.402 in;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
Standard
UL
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 3 in x 11.63 in
Package Dimensions (L x W x H)
637.54 mm x 76.2 mm x 295.402 mm
Package Weight (Imperial)
44.300 lb
Package Weight (Metric)
20.094 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.