Mersen AJT90 Fuse AJT - Class J - Time-delay 600VAC 400VDC 90A Blade SmartSpot® Amp-Trap 2000®
Alternate Item Number: AJT90
UPC: 782001962685
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Overview
- Class J time-delay fuse rated 600VAC/400VDC at 90A
- 300kA interrupting rating (self-certified, UL witnessed)
- SmartSpot® visual indicator for instant blown fuse confirmation
- IEC Type 2 No Damage protection for main, feeder, and branch circuits
- Half the mounting space of comparable Class RK fuses
Specifications
AC Voltage Rating | 600 V |
Amperage Rating | 90 A |
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 | Mersen |
Class | Class J |
Connection | Blade |
Connection Material | Tin-Plated Copper |
Connection Material | Silver-Plated Copper |
Current Rating | 90A |
Interrupt Rating | 200 kA |
Mounting | Clip or Bolted |
Series | Amp-Trap 2000 AJT |
Size | 4.63 x 1.06 in |
Size | 117.602 x 27 mm |
Size | 4.63 x 1.06;117.602 x 27 in;mm |
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 |
Special Features | Non-indicating or solid state SmartSpot visual blown fuse indicator Time-delay for motor starting and transformer inrush 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 | 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 |
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® |
Type | Class J |
Type Of Indicators | SmartSpot® |
Voltage Rating | 600 VAC |
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) | 0.241 lb |
Package Weight (Metric) | 0.109 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.
Frequently Asked Questions
What voltage ratings does the AJT90 fuse support?
The AJT90 fuse is rated for 600VAC and 400VDC.
What is the interrupting rating of the AJT90 fuse?
The AJT90 fuse has a 300kA interrupting rating, self-certified with UL witnessed tests.
Does the AJT90 fuse have a visual blown fuse indicator?
Yes, the AJT90 features a SmartSpot® solid-state visual indicator for blown fuse confirmation.
What type of protection does the AJT90 fuse provide?
The AJT90 provides IEC Type 2 No Damage protection for main, feeder, and branch circuits.
What are the typical applications for the AJT90 fuse?
Applications include motor circuits, mains, feeders, branch circuits, lighting, heating, transformers, control panels, and load centers.
How does the AJT90 fuse handle inrush currents?
The AJT90 fuse features time-delay characteristics ideal for handling motor and transformer inrush currents.
What is the mounting space requirement for the AJT90 fuse?
The AJT90 requires half the mounting space of comparable 600VAC Class RK fuses.
What is the selectivity ratio for the AJT90 fuse?
The AJT90 allows easy 2-to-1 selectivity to prevent nuisance shutdowns.
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.