AJT350 - 350 Amp Fuse

AJT350 - 350 Amp Fuse

When your electrical systems are powering critical equipment, downtime is not an option. The Mersen AJT350 Class J Time-Delay Fuse is designed to help you keep industrial and commercial operations running safely and efficiently by delivering dependable overcurrent protection in demanding environments. Built for high-performance applications, this 350 amp Amp-Trap 2000® fuse combines advanced current-limiting technology with time-delay protection, making it an excellent choice for motors, transformers, HVAC systems, panelboards, switchgear, and power distribution equipment.

What sets the AJT350 apart is its ability to handle the real-world challenges electrical systems face every day. Motor startups and transformer energizing can create temporary inrush currents that often cause standard fuses to open unnecessarily.

Maintenance crews will also appreciate the built-in SmartSpot® visual indicator, which provides a fast and simple way to identify an opened fuse during troubleshooting. Whether used in manufacturing facilities, commercial buildings, processing plants, or heavy-duty electrical distribution systems, the AJT350 delivers the protection and performance professionals expect from the trusted Mersen Amp-Trap 2000® series.

Key Features and Benefits

• Time-delay protection helps prevent nuisance openings during motor startups and transformer inrush currents: Allows temporary startup surges to pass without unnecessary interruptions.
• Advanced current-limiting design helps reduce potential damage caused by short circuits: Helps minimize thermal and mechanical stress on connected electrical systems.
• Compact Class J construction saves panel and equipment space: Fits well into installations where enclosure space is limited.
• SmartSpot® visual indicator allows quicker fuse identification during maintenance: Helps maintenance teams quickly locate opened fuses during troubleshooting.
• High 200 kA interrupting rating supports demanding industrial applications: Suitable for commercial and industrial high fault-current environments.
• Suitable for both AC and DC systems: Compatible with a variety of electrical distribution systems.
• Blade-style terminals provide secure and reliable connections: Helps support dependable installation and conductivity.
• Helps improve system uptime and operational efficiency: Designed to support reliable day-to-day electrical protection.
• Supports IEC Type 2 “No Damage” coordinated protection systems when properly applied: Helps support advanced coordinated protection requirements.
  

Technical Specifications

• Catalog Number: AJT350
  
• Manufacturer Series: Amp-Trap 2000® AJT
  
• Fuse Class: Class J
  
• Fuse Type: Time-Delay
  
• Ampere Rating: 350A
  
• Voltage Rating (AC): 600VAC
  
• Voltage Rating (DC): 500VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA
  
• Mounting Options: Clip or Bolted
  
• Terminal Type: Blade
  
• Terminal Material: Brass
  
• Indication System: SmartSpot® Visual Open Fuse Indicator
  
• Body Material: GMG
  
• Product Length: 181.1 mm
  
• Product Diameter: 54 mm
  
• Product Weight: 0.8119 kg
  

Material Compliance and Certifications

• Industry Standards: The AJT350 belongs to Mersen’s Low Voltage UL/CSA fuse family and is engineered to meet the demanding performance requirements of industrial and commercial electrical protection applications.
  

Where It Works Best

• The AJT350 is ideal for protecting motors, transformers, feeders, branch circuits, motor control centers, HVAC equipment, industrial machinery, switchboards, and commercial power distribution systems. It performs especially well in applications where temporary startup surges are common but reliable short-circuit protection is still essential.