AJT300 - 300 Amp Fuse

AJT300 - 300 Amp Fuse

The AJT300 Class J Time-Delay Fuse is made for your electrical systems where motors, transformers, and heavy equipment create temporary startup surges during normal operation. Those short bursts of extra current are common in industrial and commercial settings, and this fuse is designed to handle them without opening too quickly. At the same time, it still provides dependable protection when overloads or short circuits happen.

Its compact Class J design helps you save space inside electrical panels and switchboards, which can be helpful in tighter installations. The fuse also offers current-limiting protection, helping you reduce the amount of fault current moving through the system during a short circuit. That can help limit damage to connected equipment, wiring, and controls.

The SmartSpot® visual indicator adds a simple but useful feature for maintenance teams. When the fuse opens, the indicator provides a quick visual signal so the problem fuse can be identified faster, helping reduce troubleshooting time and downtime.

The AJT300 is commonly used in commercial and industrial power distribution systems where reliable overcurrent protection is needed every day. Its combination of time-delay performance, compact sizing, and high interrupting capacity makes it a practical fit for demanding electrical applications.

Key Features and Benefits

• Time-delay design helps reduce nuisance openings during startup currents: Allows temporary startup surges to pass without unnecessary interruptions.
• Current-limiting protection helps reduce damage during fault conditions: Helps minimize thermal and mechanical stress on connected electrical systems.
• Compact Class J size helps save panel space: Fits well into installations where enclosure space is limited.
• SmartSpot® visual indicator helps identify opened fuses quickly: Helps maintenance teams quickly locate opened fuses during troubleshooting.
• High interrupting capacity for demanding electrical systems: Suitable for commercial and industrial high fault-current environments.
• Suitable for AC and DC applications: Compatible with a variety of electrical distribution systems.
• Blade-style terminals support secure installation: Helps provide dependable fit and electrical connection.
• Commonly used in commercial and industrial applications: Designed for dependable operation in demanding environments.
  

Technical Specifications

• Catalog Number: AJT300
  
• Series: AJT – Class J – Time-Delay
  
• Fuse Type: Amp-Trap 2000®
  
• Ampere Rating: 300 Amps
  
• Voltage Rating (AC): 600 VAC
  
• Voltage Rating (DC): 500 VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: Class J
  
• Characteristic: Time Delay
  
• Interrupting Rating: 200 kA
  
• Mounting Type: Clip or Bolted
  
• Terminal Type: Blade
  
• Terminal Material: Brass
  
• Indication System: SmartSpot® Visual Indicator
  
• Body Material: GMG
  
• Product Diameter: 54 mm
  
• Product Length: 181.1 mm
  
• Product Weight: 0.8119 kg
  

Material Compliance and Certifications

• Industry Standards: The AJT300 fuse is designed for low-voltage UL and CSA applications and supports IEC Type 2 “No Damage” protection requirements when properly coordinated within electrical systems.
  

Where It Works Best

• The AJT300 is commonly installed in motor control centers, HVAC systems, industrial machinery, transformers, switchboards, feeder circuits, branch circuits, and commercial power distribution systems where temporary startup surges are expected during normal operation.