AJT4 - 4 Amp Fuse

AJT4 - 4 Amp Fuse

The AJT4 Class J Time-Delay Fuse is built for electrical systems that need dependable protection without constant nuisance fuse openings. In many commercial and industrial applications, motors, transformers, and HVAC equipment draw a quick surge of current when they start up. That’s normal — and this fuse is designed with that in mind. The AJT4 can handle those temporary startup currents while still reacting quickly if an overload or short circuit happens.

Its compact Class J cartridge design also makes it a practical choice for crowded panels and control cabinets where space is limited. The current-limiting protection helps reduce the amount of fault current moving through the circuit during a short circuit, which can help reduce damage to connected equipment and wiring. For maintenance teams and facility managers, that can mean less downtime and fewer headaches when electrical problems occur.

Key Features and Benefits

• Time-delay design helps prevent nuisance openings during equipment startup: 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 space inside electrical panels: Fits well into installations where enclosure space is limited.
• Cartridge-style construction supports easy installation and replacement: Helps provide dependable fit and straightforward maintenance.
• Non-indicating design for straightforward operation: Supports simple and reliable fuse protection.
• High interrupting capacity for demanding commercial and industrial systems: Suitable for high fault-current environments.
• Helps protect motors, transformers, HVAC equipment, and control circuits: Supports reliable overcurrent protection across multiple applications.
• Suitable for a wide range of low-voltage power distribution applications: Designed for dependable operation in commercial and industrial systems.
  

Technical Specifications

• Part Number: AJT4
  
• Type: AJT
  
• Fuse Class: Class J
  
• Fuse Style: Cartridge
  
• Ampere Rating: 4 Amps
  
• Voltage Rating: 600 VAC
  
• A.I.C. Rating: 200 kA @ 600 VAC
  
• Protection Type: Time-Delay, Current-Limiting
  
• Indication: Non-Indicating
  
• Height: 2.25 in.
  
• Width: 0.8125 in.
  
• Depth: 0.8125 in.
  

Material Compliance and Certifications

• Industry Standards: The AJT4 fuse is designed for low-voltage Class J electrical protection applications commonly used in commercial and industrial electrical systems requiring dependable overcurrent protection.
  

Where It Works Best

• The AJT4 is commonly installed in HVAC systems, industrial machinery, motor control centers, transformers, branch circuits, feeder circuits, and electrical control panels where temporary startup surges are expected during normal operation.