Mersen A155C3DNR0-300E - Mersen Amp-Trap fuses for the protection of transformers and distribution lines deliver overload and short circuit protection. These general purpose current-limiting fuses will melt at current that can be as low as 1.7 times the fuse current ratings up to its maximum interrupting rating. These fuses are designed to withstand the transformer magnetizing inrush current. They are single, double or triple barrels 3 inch diameter (size D) and mount in unique cam-locking clips for superior connections as well as easy installation and replacement. 15500 Volts 300 Amps C3 DNR0 series.
Mersen

A155C3DNR0-300E

Alternate Item Number: 782001461881

UPC: 782001461881

Contact for Pricing

Overview

The Mersen Amp-Trap A155C3DNR0-300E is a high-voltage, general-purpose current-limiting fuse engineered for reliable overload and short-circuit protection of transformers and distribution lines. Rated at 15.5kV and 300 Amps, this E-Rated fuse offers superior equipment protection by melting at currents as low as 1.7 times its rating, up to its maximum interrupting rating of 50kA Sym. Designed to withstand transformer magnetizing inrush currents, it ensures operational continuity in demanding applications. This specific model features a triple barrel configuration with a 3-inch diameter (Size D) and utilizes Mersen's unique cam-locking clips. These clips provide superior electrical connections, ensuring high integrity and facilitating easy installation and replacement. The fuse is UL listed for compatibility with UL listed equipment and features a non-venting design for silent operation. For positive identification of an open fuse, a blown-fuse indicator is included. The A155C3DNR0-300E is part of the Amp-Trap CL-14 Series, suitable for indoor use or outdoor applications within a weatherproof enclosure. Its robust construction and precise protection capabilities make it a dependable choice for medium-voltage electrical systems. Manufactured in the USA, this fuse offers lasting identification with its metal embossed catalog number and manufacturing date.
  • 15.5kV AC, 300A rated current
  • 50kA Sym Maximum Interrupting Rating (IR)
  • Current-limiting for superior equipment protection
  • Designed to withstand transformer magnetizing inrush current
  • 3-inch diameter (Size D) triple barrel with cam-locking clips

Specifications

Amperage Rating
300 A
Application
Protection for 12kV to 15.5kV transformers or distribution systems.
Brand Name
Ferraz Shawmut
Connection
Blade
Connection Type
cam-locking clips
Current Rating
300 A
Mounting
Clip-lock
Mounting Type
cam-locking clips
Poles
Single/Double/Triple
Poles
Single/Double/Triple barrel
Series
C3 DNR0
Size
3 inch diameter (size D)
Special Features
UL listed for compatibility with UL listed equipment. Clip-lock mounting for reliable high integrity connection into circuit. Current-limiting for superior equipment protection. Non-venting for silent operation Metal embossed catalog number and manufacturing date for lasting identification. Blown-fuse indicator to give positive identification of open fuse. 2 lb tripped force - 0.50 Inch
Standard
UL listed to standard File E143362
Type
General Purpose Fuses E-Rated
Voltage Rating
15500 VAC
Package Dimensions (L x W x H)
26.5 IN x 12.5 IN x 3 IN
Package Dimensions (L x W x H)
67.31 cm x 31.75 cm x 7.62 cm
Package Weight (Imperial)
42.105 L
Package Weight (Metric)
19.099 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.