Mersen AJT2-1/4 - Amp-Trap 2000 time-delay AJT fuses provide IEC Type "2" (No Damage) protection to main, feeder, and branch-circuits, for all types of loads - yet, they require only half the mounting space needed for 600V UL Class RK fuses. Time-delay characteristics handle motor in-rush currents without nuisance trips. Its current-limiting ability and wide range of ratings provide excellent overcurrent protection for all your applications. An optional mechanical blown fuse indicator and Microswitch is available on blade-type (70 to 600A) fuses for visual and/or remote blown fuse indication. 600 Volts 2.25 amps .
Mersen

AJT2-1/4

Alternate Item Number: AJT2-1/4

UPC: 782001962777

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Overview

The Mersen AJT2-1/4 Amp-Trap 2000 time-delay fuse delivers superior IEC Type 2 (No Damage) overcurrent protection for industrial electrical systems, combining compact design with robust performance. Engineered for main, feeder, and branch circuits, this 600V-rated fuse handles all load types—from motor circuits to lighting and transformers—while occupying only half the mounting space of traditional 600V UL Class RK fuses. Its advanced time-delay characteristics effectively manage motor in-rush currents and transformer startup surges, eliminating nuisance trips that disrupt operations. With a 2.25A current rating and 300kA interrupting rating (self-certified, UL witnessed), the AJT2-1/4 provides unmatched current-limiting performance, reducing arc flash energy and enhancing workplace safety. The fiberglass body ensures dimensional stability in harsh environments, while the high-grade silica filler enables rapid arc quenching for reliable fault interruption. Optional SmartSpot visual blown fuse indicators and Microswitches (available on blade-type fuses 70-600A) enable real-time monitoring, allowing maintenance teams to quickly identify faults and minimize downtime. Mersen’s Amp-Trap 2000 series is UL listed to standard 248-8 (File E2137) and IEC 269-2-1, meeting the stringent demands of industrial, commercial, and utility applications. Its unique Class J dimensions prevent replacement errors, ensuring system integrity. Ideal for motor circuits, control panels, bus ducts, and load centers, the AJT2-1/4 is a trusted solution for engineers prioritizing reliability, space efficiency, and arc flash mitigation. Mersen’s decades of expertise in electrical protection technology underpin this fuse’s reputation for durability and precision, making it a preferred choice for facilities requiring Type 2 coordination without compromising on performance or safety.
  • IEC Type 2 (No Damage) protection for main, feeder, and branch circuits
  • Handles motor in-rush currents with time-delay characteristics to prevent nuisance trips
  • 300kA interrupting rating (self-certified, UL witnessed) for superior fault protection
  • Compact design requires only half the mounting space of 600V Class RK fuses
  • Optional SmartSpot visual blown fuse indicators and Microswitches for remote monitoring
  • Fiberglass body with high-grade silica filler for stability and fast arc quenching
  • UL listed to standard 248-8 (File E2137) and IEC 269-2-1 compliant
  • Ideal for motor circuits, transformers, control panels, bus ducts, and load centers

Specifications

AC Voltage Rating
600 V
Amperage Rating
2.25 A
Application
Motor Circuits Mains Feeders Branch Circuits Lighting Heaters Transformers Control Panels Circuit Breaker Back-up Bus Duct Load Centers
Application
Motor circuits Mains Feeders Branch circuits Lighting, heating & general loads Transformers Control panels Circuit breaker back-up Bus duct Load centers
Body Material
GMG
Brand Name
Ferraz Shawmut
Class
Class J
Color
Orange
Connection
Ferrule
Connection Material
Tin-Plated Copper
Connection Type
Blade-type
Current Rating
2.25 A
Interrupt Rating
200 kA
Material
Fiberglass, Silica
Mounting
Clip
Mounting Type
Mounting space reduced by 50%
Series
Amp-Trap 2000
Size
2.25 x 0.81 in
Size
57.15 x 20.65 mm
Size
Class J dimensions
Special Features
Solid-state SmartSpot indicator Time-delay for motor starting and transformer inrush 300kA interrupting rating, self-certified (UL witnessed) Extremely current-limiting for low peak let-thru current Most current-limiting UL class fuse Small footprint requires less mounting space and allows smaller, more economical fuse blocks Easy 2-to-1 selectivity for prevention of nuisance shutdowns Unique Class J dimensions prevent replacement errors High-visibility orange label gives instant recognition Metal embossed date and catalog number for traceability and lasting identification Fiberglass body provides dimensional stability in harsh industrial settings High-grade silica filler ensures fast arc quenching Optional EI blown fuse indicator/switch available
Special Features
Non-indicating or solid state SmartSpot visual blown fuse indicator Time-delay for motor starting and transformer inrush Self Certified 700VAC, 15-600A range, 100kA IR 300kA interrupting rating - self-certified, UL witnessed tests Extremely current-limiting for low peak let-thru current Most current-limiting UL class fuse Recommended for Arc Flash energy reduction Small footprint requires less mounting space and allows smaller, more economical fuse blocks Easy 2-to-1 selectivity for prevention of nuisance shutdowns Unique Class J dimensions prevent replacement errors High-visibility orange label gives instant brand recognition Metal-embossed date and catalog number for traceability and lasting identification Fiberglass body provides dimensional stability in harsh industrial settings High-grade silica filler ensures fast arc quenching Optional EI indicator/switch mount for AJT70 to 600 open fuse indication
Standard
UL Listed to Standard 248-8, File E2137 DC Listed to UL Standard 248 CSA Certified to Standard C22.2, No. 248.8 IEC 269-2-1
Standard
AJT (1-600): UL listed to standard 248-8 File E2137 DC listed to UL standard 248 CSA certified to standard C22.2 No. 248.8 IEC 60269-2-1 AJT (70-600) EI: UL listed DC tested to UL standard 248 Self Certified 700VAC, 15-600A range
Sub Brand
Amp-Trap® 2000, SmartSpot®
Type
Class J
Type
North American Power Fuses
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
2.25 IN x 0.813 IN x 0.813 IN
Package Dimensions (L x W x H)
5.715 cm x 20.6502 mm x 20.6502 mm
Package Weight (Imperial)
0.200 L
Package Weight (Metric)
0.091 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.