Mersen A155B2D0R0-9R - Back-Up R-Rated Medium Voltage Fuse 15500VAC 9R Mounting: Bolted Style: D0R0 Visual Indicator Amp-Trap®
Mersen

A155B2D0R0-9R

Alternate Item Number: A155B2D0R0-9R

UPC: 782001359447


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Overview

The Mersen Amp-Trap® Bolt-In Series A155B2D0R0-9R is a critical component for medium voltage motor protection, specifically designed for short circuit protection of motors and motor control centers (MCCs). This R-Rated fuse operates at 15.5kV AC and features a continuous amp rating of 200A at 40°C. With a minimum interrupting rating of 888 kA RMS Sym, it provides robust protection against fault currents. The A155B2D0R0-9R is a back-up fuse, requiring coordination with overload relays in combination motor starters, a specification typically provided by the motor starter manufacturer. Its design incorporates two barrels (2 Barrel configuration) and a visual indicator for positive identification of an open fuse, offering a tripped force of 1 lb and 0.44 inches of indicator travel. The bolt-in mounting style allows for direct connection to equipment bus or terminal pads, ensuring a secure mechanical connection. UL Recognized (File E93367 and File E191980), this fuse is built for reliability and performance in demanding industrial applications. Its metal-embossed catalog number and manufacturing date ensure lasting identification. The dimensions of this 3-inch diameter fuse are critical for integration into existing systems. This model is frequently requested for replacement in MCCs from numerous manufacturers, highlighting its widespread adoption and compatibility. The Mersen A155B2D0R0-9R is manufactured in the USA.
  • 15.5kV AC operating voltage
  • 200A continuous amp rating at 40°C
  • 888 kA RMS Sym minimum interrupting rating
  • 2 Barrel configuration with bolt-in mounting
  • Visual blown-fuse indicator for positive identification

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
Interrupt Rating
50 kA
Mounting
Bolt-on
Size
25.1 x 3 x 7.63;637.54 x 76.2 x 193.802 in;mm
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
15500 VAC
Package Dimensions (L x W x H)
25.1 in x 3 in x 7.63 in
Package Dimensions (L x W x H)
637.54 mm x 76.2 mm x 193.802 mm
Package Weight (Imperial)
29.000 lb
Package Weight (Metric)
13.154 kg
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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.