Mersen A6K25R - Fuse A6K-R - Class RK1 - Fast-Acting 600VAC 300VDC 25A Ferrule Amp-Trap®
Mersen

A6K25R

Alternate Item Number: A6K25R

UPC: 782001915599


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Overview

The Mersen A6K25R Amp-Trap® fuse (SKU A6K25R) is a Class RK1, fast-acting fuse designed for high-performance overcurrent protection in industrial electrical systems. Rated for 600VAC and 300VDC with a 25A current rating, this fuse delivers exceptional current limitation, reducing peak let-thru current to minimize damage during fault conditions. Its rejection-style design ensures only Class RK1 fuses can replace it, preventing improper substitutions that could compromise safety. The fiberglass body provides dimensional stability and durability in harsh industrial environments, including high-vibration or corrosive settings. With an interrupting rating of 200kA AC and 20kA DC, the A6K25R reliably interrupts short-circuit events without failure. Easy-to-read imprint labels enable quick identification and replacement, reducing downtime during maintenance. Ideal for branch and feeder circuits, the A6K25R provides back-up protection in loadcenters, panelboards, switchboards, and bus duct systems. It is also suitable for non-inductive or lighting circuits where fast response to overcurrent is critical. Compatible with Mersen’s recommended Class RK1 fuse blocks (e.g., 60306R, 60606R), this fuse meets UL 248-12 and CSA C22.2 No. 248.12 standards, with self-certification for DC per UL248.
  • Class RK1 rejection-style fuse prevents improper substitutions
  • Fast-acting design limits peak let-thru current for superior protection
  • Rated 600VAC/300VDC with 25A current capacity
  • Interrupting rating: 200kA AC, 20kA DC
  • Fiberglass body ensures dimensional stability in harsh environments

Specifications

AC Voltage Rating
600 V
Amperage Rating
25 A
Application
Load centers Panelboards Switchboards Bus duct Feeder circuits Non-inductive loads Lighting circuits
Body Material
PolyTube
Brand Name
Mersen
Class
Class RK1
Connection
Ferrule
Connection Material
Tin-Plated Copper
Current Rating
25A
DC Voltage Rating
300 V
Fuse Class
RK1
Interrupt Rating
200 kA
Material
Fiberglass
Mounting
Clip
Size
5 x 0.81 in
Size
127 x 20.625 mm
Special Features
Rejection style design prevents replacement by other fuse classes Fiberglass body provides dimensional stability in harsh industrial environments Easy-to-read imprint label for quick recognition and replacement High degree of current limitation for low peak let-thru current
Standard
UL listed to standard 248-12 File E2137 CSA certified to standard C22.2 No. 248.12 Self-certified for DC per UL248
Sub Brand
Amp-Trap®
Type
Class RK1
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
5 in x 0.81 in x 0.81 in
Package Dimensions (L x W x H)
127 mm x 20.625 mm x 20.625 mm
Package Weight (Imperial)
0.136 lb
Package Weight (Metric)
0.062 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.