Mersen A155B2D0R0-125E - Medium Voltage E-Rated Fuse 15500VAC 125A Bolt-On, Series: D0R0 Visual Indicator Amp-Trap®
Mersen

A155B2D0R0-125E

Alternate Item Number: A155B2D0R0-125E

UPC: 782001506445


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Overview

The Mersen A155B2D0R0-125E is a medium voltage E-Rated fuse designed for transformer and distribution line protection. Rated at 15,500V AC and 125A, this bolt-on fuse provides overload and short circuit protection with current-limiting performance starting at 1.7 times the rated current up to its maximum interrupting rating. The D0R0 Series features single, double, triple, or quadruple barrel configurations with a 3-inch diameter, optimized for direct bolting to equipment bus or terminal pads. These fuses are engineered to withstand transformer magnetizing inrush currents while maintaining reliable operation. The visual indicator (Amp-Trap®) provides clear fault indication for quick diagnostics. Ideal for industrial and utility applications requiring precise fault interruption and high interrupting capacity. Manufacturer: Mersen. SKU: A155B2D0R0-125E. UNSPSC: 39121626. Country of Origin: US.
  • Medium Voltage E-Rated Fuse for Transformer Protection
  • 15,500V AC / 125A Rating
  • Bolt-On Design for Direct Mounting
  • D0R0 Series with 3-inch Diameter
  • Amp-Trap® Visual Indicator for Fault Indication

Specifications

AC Voltage Rating
15500 V
Amperage Rating
125 A
Application
Protection for 5.5kV to 15.5kV transformers or distribution systems
Body Material
GMG
Brand Name
Mersen
Connection
Bolted
Connection Material
Silver-Plated Copper
Connection Type
Bolt-on
Current Rating
125 A
Interrupt Rating
50 kA
Mounting
Bolted
Mounting
Bolt-on
Mounting Type
Direct bolting to equipment bus or terminal pads
Mounting Type
Bolt-On
Series
D0R0
Size
25.11 x 3 x 7.63;637.794 x 76.2 x 193.802 in;mm
Size
3-inch diameter
Size
25.11 x 3 x 7.63 in
Size
637.794 x 76.2 x 193.802 mm
Special Features
UL listed for compatibility with UL listed equipment Bolt-In mounting for direct connection to bus or terminals 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 Blown-fuse indicator to give positive identification of open fuse Amp trap: 1 lb tripped force - 0.44 Inch 9F62: 0.125 lb tripped force – 0.20 Inch
Standard
Some UL Listed to standard E143362
Sub Brand
Amp-Trap®
Type
General Purpose Bolt-On Fuses for Transformer Protection
Type Of Indicators
Visual Indicator
Voltage Rating
15500 VAC
Package Dimensions (L x W x H)
25.11 in x 3 in x 7.63 in
Package Dimensions (L x W x H)
637.794 mm x 76.2 mm x 193.802 mm
Package Weight (Imperial)
28.000 lb
Package Weight (Metric)
12.701 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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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.