Mersen AJT90ID - Fuse AJT - Class J - Time-delay 600VAC 400VDC 90A Blade SmartSpot® Amp-Trap 2000®
Mersen

AJT90ID

Alternate Item Number: AJT90ID

UPC: 782001518639


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Overview

The Mersen AJT90ID Class J time-delay fuse (SKU: AJT90ID) delivers reliable overcurrent protection for industrial circuits with advanced SmartSpot® visual open-fuse indication. Rated for 90A at 600VAC and 400VDC, this Amp-Trap 2000® fuse combines IEC Type 2 No Damage protection for main, feeder, and branch circuits with superior current-limiting performance, reducing let-through energy (I²t) by up to 50% compared to standard fuses. Its time-delay design safely handles motor and transformer inrush currents while occupying only half the mounting space of 600VAC Class RK fuses. The SmartSpot® indicator provides immediate visual confirmation of fuse operation, reducing troubleshooting time without requiring additional test equipment. Designed for non-indicating applications where space efficiency and precise protection are critical, the AJT90ID is ideal for panelboards, motor control centers, and distribution systems in manufacturing, utilities, and commercial facilities. Compliance with Class J standards ensures compatibility with NEC and UL requirements for industrial power distribution, meeting UL 248-8 and CSA certification standards. The fuse’s 300kA interrupting rating at 600VAC and 200kA at 400VDC provides robust protection against high-fault currents, while its compact 1.25" x 2.5" blade dimensions optimize panel space utilization.
  • 90A rating at 600VAC/400VDC for industrial circuits
  • SmartSpot® visual open-fuse indicator for quick diagnostics
  • IEC Type 2 No Damage protection for main, feeder, and branch circuits
  • Time-delay design handles motor/transformer inrush currents
  • 50% smaller mounting footprint vs. 600VAC Class RK fuses

Specifications

Package Dimensions (L x W x H)
4.63 in x 1.06 in x 1.06 in
Package Dimensions (L x W x H)
117.602 mm x 27 mm x 27 mm
Package Weight (Imperial)
0.2410 lb
Package Weight (Metric)
0.1090 kg
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9F61 Size B Clips 1.6in

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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.

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.