Mersen A3T25 - Fuse A3T - Class T - Fast-Acting 300VAC 160VDC 25A Ferrule Amp-Trap®
Mersen

A3T25

Alternate Item Number: A3T25

UPC: 782001890087


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Overview

The Mersen A3T25 (SKU: A3T25) is a Class T fast-acting fuse engineered for critical overcurrent protection in industrial and commercial electrical systems. This ferrule-style fuse offers exceptional current-limiting capabilities, minimizing peak let-thru current and reducing stress on downstream equipment during fault conditions. It is rated for 300VAC and 160VDC at 25A, with a high interrupting rating of 200kA AC and 50kA DC, ensuring reliable protection in high-fault applications. The A3T25 features a durable glass melamine body for dimensional stability and permanently stamped catalog numbers on its blades for clear identification and traceability. Its unique Class T dimensions prevent substitution with lower-rated fuses, safeguarding system integrity. Approved by UL (standard 248-15, File E2137) and CSA (C22.2 no. 248.15), this fuse is suitable for use in loadcenters, panelboards, switchboards, and metering centers. Its compact physical size offers design flexibility. Applications include protection of heavy-duty rectifiers and similar heavy power supplies.
  • Fast-acting, extremely current-limiting for low peak let-thru current.
  • Unique Class T dimensions prevent substitution with lower-rated fuses.
  • Durable glass melamine body with permanently stamped catalog numbers.
  • Rated 300VAC / 160VDC, 25A with 200kA AC / 50kA DC interrupting rating.
  • UL listed to standard 248-15 and CSA certified to C22.2 no. 248.15.

Specifications

AC Voltage Rating
300 V
Amperage Rating
25 A
Application
Load centers Panelboards Switchboards Circuit breakers Metering centers
Body Material
GMG
Brand Name
Mersen
Class
Class T
Connection
Ferrule
Connection Material
Copper
DC Voltage Rating
160 V
Interrupt Rating
200 kA
Mounting
Clip
Size
0.88 x 0.41 in
Size
22.352 x 10.414 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
300 VAC
Package Dimensions (L x W x H)
0.88 in x 0.41 in x 0.41 in
Package Dimensions (L x W x H)
22.352 mm x 10.414 mm x 10.414 mm
Package Weight (Imperial)
0.012 lb
Package Weight (Metric)
0.005 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.