Mersen AJT300/600 Reducer Fuse AJT - Class J - Time-delay 600VAC 500VDC 300A Blade
Alternate Item Number: AJT300/600
UPC: 782001463892
Documents & Media
Contact for Pricing
Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.
Overview
- Class J time-delay fuse for 600VAC/500VDC applications
- 300A current rating with 200kA AC and 100kA DC interrupting rating
- Permanent reducer solution compatible with Class J fuse holders
- Time-delay design accommodates motor starting and transformer inrush currents
- High-visibility orange label for instant brand recognition and traceability
Specifications
AC Voltage Rating | 600 V |
Amperage Rating | 300 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 | Brass |
Connection Type | Blade |
Current Rating | 300 A |
Interrupt Rating | 200 kA |
Mounting | Clip or Bolted |
Series | AJT |
Size | 8 x 2.5 in |
Size | 203.2 x 63.5 mm |
Size | Class J |
Size | 8 x 2.5;203.2 x 63.5 in;mm |
Special Features | Replaces traditional temporary-use only Fuse Reducer accessories Recommended for Arc Flash energy reduction Extremely current-limiting for low peak let-thru current Most current-limiting UL class fuse Time-delay for motor starting and transformer inrush 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 |
Standard | UL Listed to standard 248-8 IEC 269-2-1 |
Type | Class J |
Voltage Rating | 600 VAC / 500 VDC |
Package Dimensions (L x W x H) | 8 in x 2.5 in x 2.5 in |
Package Dimensions (L x W x H) | 203.2 mm x 63.5 mm x 63.5 mm |
Package Weight (Imperial) | 3.250 lb |
Package Weight (Metric) | 1.474 kg |
GPM-SRR90
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
C331156
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
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
What voltage ratings does the AJT300/600 support?
The AJT300/600 supports 600VAC and 500VDC voltage ratings.
What is the body size of the AJT300/600?
The AJT300/600 is rated for 300A in a 600A body size.
Is the AJT300/600 UL Listed?
The AJT300/600 is UL Listed to standard 248-8 File E2137.
What is the interrupting rating of the AJT300/600?
The AJT300/600 has an interrupting rating of 200kA AC and 100kA DC. It is self-certified for 600VAC with a 300kA rating witnessed by UL.
What is the time-delay characteristic of the AJT300/600?
The AJT300/600 features a time-delay design to handle motor starting and transformer inrush currents without nuisance tripping.
What applications is the AJT300/600 suitable for?
The AJT300/600 is suitable for motor circuits, mains, feeders, branch circuits, lighting, heating, transformers, control panels, and bus ducts.
Is the AJT300/600 a permanent or temporary fuse solution?
The AJT300/600 is a permanent solution for decreasing current rating without using a temporary fuse reducer accessory.
Does the AJT300/600 have a visual blown fuse indicator?
The AJT300/600 does not explicitly mention a visual blown fuse indicator in the provided catalog content.
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.