AJT125 - 125 Amp Fuse

AJT125 - 125 Amp Fuse

The AJT125 Class J Time-Delay Fuse is a reliable choice for protecting your electrical systems that regularly experience startup surges from motors, transformers, and similar equipment. In many commercial and industrial settings, those brief inrush currents are normal, but they can cause standard fuses to open when there’s no real problem. The AJT125 is built to handle those temporary surges while still responding quickly when overloads or short circuits happen.

This 125 amp fuse is part of the Amp-Trap 2000® series and offers strong current-limiting protection to help reduce damage during fault conditions. By limiting the amount of fault energy passing through the circuit, it helps protect your connected equipment, wiring, and electrical components from more serious issues. Its compact Class J design also helps you save space inside electrical panels and control equipment, which can be especially useful in tighter installations.

Another helpful feature is the SmartSpot® visual indicator. When the fuse opens, the indicator gives maintenance teams a quick way to identify the problem fuse without extra testing or guesswork. That can make troubleshooting faster and help reduce downtime during repairs.

Key Features and Benefits

• Time-delay design helps prevent nuisance fuse openings during startup currents: Allows temporary inrush currents to pass without unnecessary interruptions.
• Current-limiting protection helps reduce damage during short circuits and overloads: Helps minimize thermal and mechanical stress on connected electrical equipment.
• SmartSpot® indicator allows quick visual identification of an open fuse: Helps maintenance personnel troubleshoot and replace opened fuses more efficiently.
• Compact Class J size helps maximize panel space: Fits well into installations where enclosure space is limited.
• Rated for both AC and DC applications: Compatible with a variety of electrical distribution systems.
• High 200 kA interrupting capacity for demanding systems: Provides dependable protection in high fault-current environments.
  

Technical Specifications

• Catalog Number: AJT125
  
• Series: AJT – Class J – Time-Delay
  
• Fuse Type: Amp-Trap 2000®
  
• Ampere Rating: 125 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 Options: Clip or Bolted
  
• Terminal Type: Blade
  
• Terminal Material: Brass
  
• Indication System: SmartSpot® Visual Open Fuse Indicator
  
• Product Diameter: 41.3 mm
  
• Product Length: 146 mm
  
• Body Material: GMG
  
• Product Weight: 0.3465 kg
  

Material Compliance and Certifications

• Industry Standards: The AJT125 fuse is designed for low-voltage UL and CSA applications and supports IEC Type 2 “No Damage” coordinated protection requirements when properly applied within electrical systems.
  

Where It Works Best

• HVAC systems
• Motor control centers
• Industrial machinery
• Transformers
• Feeder circuits
• Branch circuits
• Commercial power distribution systems
• Manufacturing equipment
• Electrical control panels
• Applications with frequent startup or inrush currents