AJT500 - 500 Amp Fuse

AJT500 - 500 Amp Fuse

The AJT500 Class J Time-Delay Fuse is built for your electrical systems that work hard every day. Large motors, transformers, compressors, and industrial equipment often pull extra current for a few seconds during startup. That’s normal — and the AJT500 is designed to handle those temporary surges without opening unnecessarily. At the same time, it still provides dependable protection if the system experiences an overload or short circuit.

For many commercial and industrial facilities, avoiding unnecessary downtime is just as important as protecting equipment. That’s where the AJT500 stands out. Its time-delay performance helps keep your equipment running during normal startup conditions, while its current-limiting design helps reduce the amount of fault current moving through the system during electrical faults. That can help limit damage to wiring, controls, and connected equipment.

The compact Class J design also helps save space inside electrical panels and switchboards, which can make installations cleaner and easier to manage. Maintenance is simpler too thanks to the built-in SmartSpot® visual indicator, which helps technicians quickly identify when the fuse has opened.

The AJT500 is commonly used in motor control centers, HVAC systems, industrial machinery, transformers, feeder circuits, and commercial power distribution systems where reliable overcurrent protection is needed day after day.

Key Features and Benefits

• Time-delay design helps reduce nuisance openings during startup currents: Helps allow temporary startup surges without unnecessary fuse openings.
• Current-limiting protection helps reduce damage during fault conditions: Helps reduce fault current moving through the system during short circuits.
• Compact Class J size helps save panel space: Useful for tighter electrical panels and switchboards.
• SmartSpot® visual indicator helps identify opened fuses quickly: Helps technicians locate opened fuses faster during maintenance.
• High interrupting capacity for demanding electrical systems: Designed for commercial and industrial applications.
• Suitable for AC and DC applications: Supports a variety of electrical system requirements.
• Blade-style terminals support secure installation: Helps provide dependable electrical connections.
• Commonly used in commercial and industrial electrical systems: Suitable for a wide range of power distribution applications.
  

Technical Specifications

• Catalog Number: AJT500
  
• Series: AJT – Class J – Time-Delay
  
• Fuse Type: Amp-Trap 2000®
  
• Ampere Rating: 500 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: 63.5 mm
  
• Product Length: 203.2 mm
  
• Product Weight: 1.3698 kg
  

Material Compliance and Certifications

• Industry Standards: The AJT500 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 AJT500 is commonly installed in HVAC systems, industrial machinery, transformers, motor control centers, switchboards, feeder circuits, branch circuits, and commercial power distribution systems where temporary startup surges are expected during normal operation.