Mersen A6T40 - Fuse A6T - Class T - Fast-Acting 600VAC 300VDC 40A Ferrule Amp-Trap®
Mersen

A6T40

Alternate Item Number: A6T40

UPC: 782001891084


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Overview

The Mersen A6T40 is a Class T, fast-acting fuse designed for high current-limitation and compact physical dimensions. This specific unit, SKU A6T40, is rated for 40 Amperes, 600 Volts AC, and 300 Volts DC. Its unique dimensions are a critical design feature, engineered to prevent the substitution of other fuses that may possess lower voltage ratings or inferior current-limiting capabilities. This ensures that the intended level of protection is maintained. The fuse body is constructed from glass melamine, a material chosen for its superior dimensional stability, which contributes to the fuse's reliable performance and longevity. For permanent and clear identification, the catalog numbers are stamped directly into the fuse blades. Manufactured in the US by Mersen, this Amp-Trap® fuse provides essential overcurrent protection for various industrial applications where precise and rapid fault interruption is paramount. Its construction and ratings make it suitable for circuits requiring robust protection against short circuits and overloads, while its physical size offers advantages in panel space utilization. The fast-acting nature ensures minimal damage to equipment by quickly clearing fault currents. This fuse is a key component in maintaining the safety and operational integrity of electrical systems.
  • Fast-acting Class T fuse for rapid overcurrent protection
  • Rated for 40 Amperes, 600 Volts AC, and 300 Volts DC
  • High current-limitation capability
  • Compact physical dimensions prevent improper substitutions
  • Durable glass melamine body for dimensional stability

Specifications

AC Voltage Rating
600 V
Amperage Rating
40 A
Application
Load centers Panelboards Switchboards Circuit breakers Metering centers
Body Material
GMG
Brand Name
Mersen
Class
Class T
Connection
Ferrule
Connection Material
Copper
Connection Type
Ferrule
Current Rating
40A
DC Voltage Rating
300 V
Interrupt Rating
200 kA
Material
Glass Melamine
Mounting
Clip
Series
Amp-Trap
Size
1.57 x 0.81 in
Size
39.878 x 20.574 mm
Special Features
Extremely current-limiting for low peak let-thru current Unique dimensions prevent replacement by other fuse classes Blade-stamped catalog numbers for permanent identification Small physical size for greater design flexibility
Standard
UL listed to standard 248-15 File E2137 CSA certified to standard C22.2 no. 248.15 DC listed to UL standard 248
Sub Brand
Amp-Trap®
Type
Class T
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
1.57 in x 0.81 in x 0.81 in
Package Dimensions (L x W x H)
39.878 mm x 20.574 mm x 20.574 mm
Package Weight (Imperial)
0.083 lb
Package Weight (Metric)
0.038 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.
9F61 Size B Clips 1.6in

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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.