Mersen A6K125R - Fuse A6K-R - Class RK1 - Fast-Acting 600VAC 300VDC 125A Blade Amp-Trap®
Mersen

A6K125R

Alternate Item Number: A6K125R

UPC: 782001915773


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Overview

The Mersen A6K125R is a Class RK1, fast-acting Amp-Trap® fuse engineered for reliable overcurrent protection in industrial settings. This fuse offers a high interrupting rating of 200kA AC and 20kA DC, effectively limiting fault current and minimizing let-thru energy to protect sensitive equipment. Its rejection-style design ensures correct fuse class replacement, preventing the installation of lower-rated fuses. The fiberglass body provides dimensional stability, making it suitable for demanding industrial environments. Rated for 600VAC and 300VDC, the A6K125R is ideal for branch and feeder circuits, load centers, panelboards, switchboards, bus duct, non-inductive loads, and lighting circuits. Key features include its highly current-limiting capability and fast-acting response. Approvals include UL listed to standard 248-12 (File E2137) and CSA certified to standard C22.2 No. 248.12. Manufactured in the USA, this fuse is a critical component for applications with high available short-circuit currents. SKU: A6K125R.
  • Class RK1, Fast-Acting Amp-Trap® Fuse
  • 125A, 600VAC / 300VDC Ratings
  • 200kA AC / 20kA DC Interrupting Rating
  • Rejection Style Design for Proper Replacement
  • Fiberglass Body for Dimensional Stability
  • UL Listed to Standard 248-12, CSA Certified to C22.2 No. 248.12

Specifications

AC Voltage Rating
600 V
Amperage Rating
125 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
Blade
Connection Material
Tin-Plated Copper
Connection Type
Blade
Current Rating
125A
DC Voltage Rating
300 V
Fuse Class
RK1
Interrupt Rating
200 kA
Material
Fiberglass
Mounting
Clip
Mounting Type
Rejection-style
Series
A6K-R
Size
9.63 x 1.81 in
Size
244.602 x 46.05 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)
9.63 in x 1.81 in x 1.81 in
Package Dimensions (L x W x H)
244.602 mm x 46.05 mm x 46.05 mm
Package Weight (Imperial)
1.460 lb
Package Weight (Metric)
0.662 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.