A4J500 - 500 Amp Fuse

A4J500 - 500 Amp Fuse

The Mersen A4J500 Amp-Trap® Class J Fast-Acting Fuse is designed for your electrical systems that require fast, reliable protection in high-demand commercial and industrial environments. Rated at 500 amps, this fuse reacts quickly during overloads and short-circuit conditions to help protect your connected equipment before serious damage can occur. In facilities where electrical downtime can interrupt operations and increase maintenance costs, dependable overcurrent protection is essential for keeping systems running safely.

The A4J500 uses current-limiting technology to help reduce the amount of damaging fault energy moving through the circuit. That fast response can help you protect transformers, motor control centers, switchgear, HVAC systems, industrial machinery, and power distribution equipment from excess stress during fault conditions. Its high interrupting capacity also makes it a strong choice for systems where available fault current levels are substantial.

This fuse features a Class J rejection-style design that helps prevent lower-rated replacement fuses from being installed by mistake. That added safeguard can help you improve maintenance safety and maintain proper circuit protection throughout the system. The blade-style terminals provide secure installation in compatible fuse holders, while the durable GMG body material is designed for long-term use in demanding operating environments.

With a 600VAC / 300VDC rating and a 200 kA interrupting capacity, the Mersen A4J500 is commonly used in manufacturing facilities, branch circuits, electrical distribution systems, commercial buildings, and industrial equipment where fast fault interruption is important.

Key Features and Benefits

• 500 amp Class J fast-acting fuse: Designed for dependable overcurrent protection.
• Helps protect equipment from overloads and short circuits: Supports reliable circuit protection.
• Fast response: Helps reduce damage during fault conditions.
• Current-limiting design: Helps lower fault energy.
• Class J rejection-style construction: Helps prevent incorrect replacement.
• High 200 kA interrupting rating: Designed for demanding fault-current conditions.
• Suitable for AC and DC applications: Supports commercial and industrial electrical systems.
• Blade terminal design: Provides secure installation.
• Brass alloy terminals: Provide dependable conductivity.
• Durable GMG body construction: Designed for industrial and commercial environments.
• ROHS compliant: Supports environmental compliance requirements.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4J500
  
• Series: Amp-Trap® A4J
  
• Fuse Class: Class J
  
• Fuse Type: Fast-Acting
  
• Amp Rating: 500A
  
• Voltage Rating: 600VAC / 300VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA AC
  
• Current Type: AC/DC
  
• Mounting Style: Clip
  
• Terminal Type: Blade
  
• Terminal Material: Brass Alloy
  
• Body Material: GMG
  
• Product Diameter: 63.5 mm
  
• Product Length: 203.2 mm
  
• Product Weight: 1.3698 kg
  
• UPC/EAN: 782001960490
  

Material Compliance and Certifications

• ROHS Compliant: Designed to support environmental compliance requirements.
• Low Voltage UL/CSA Applications: Designed for Low Voltage UL/CSA fuse applications.
• Suitable for industrial and commercial electrical systems: Designed for dependable overcurrent protection.
  

Where It Works Best

• The A4J500 works well in industrial machinery, electrical distribution systems, manufacturing facilities, motor control centers, HVAC equipment, branch circuits, and commercial power applications where fast overcurrent protection is needed. It is especially useful in systems with high available fault current where protecting your valuable electrical equipment and minimizing unplanned downtime are important priorities.