A4J350 - 350 Amp Fuse

A4J350 - 350 Amp Fuse

When your electrical systems are exposed to dangerous overloads or short-circuit conditions, having the right fuse in place can make all the difference. The Mersen A4J350 Amp-Trap® Class J Fast-Acting Fuse is designed to deliver fast, dependable circuit protection for demanding commercial and industrial applications. Rated for 350 amps with a 600VAC and 300VDC capacity, this Class J fuse reacts quickly to fault conditions, helping you reduce damage to expensive equipment and minimizing unplanned downtime. Its advanced current-limiting design helps stop excessive fault currents before they can spread through your system, making it a smart choice for facilities that rely on consistent electrical performance day after day.

Whether you're protecting motor control centers, HVAC systems, industrial machinery, or power distribution equipment, this fast-acting fuse is engineered to help keep operations running safely and efficiently.

For contractors, maintenance teams, and facility managers looking for dependable overcurrent protection, the Mersen A4J350 offers the performance, safety, and durability needed in high-demand electrical systems. Its high 200 kA interrupting rating makes it especially effective in applications where fault current levels can be substantial, giving you confidence that your equipment has strong protection when it matters most.

Key Features and Benefits

• Fast-acting Class J fuse: Designed for rapid fault response.
• 350 amp rating: Suitable for demanding commercial and industrial applications.
• Current-limiting protection: Helps reduce equipment damage.
• Helps minimize downtime: Designed to respond during overloads and short circuits.
• Rejection-style Class J design: Helps prevent incorrect fuse replacement.
• High 200 kA interrupting capacity: Provides enhanced system protection.
• Suitable for both AC and DC applications: Supports commercial and industrial electrical systems.
• Blade terminal construction: Provides secure installation.
• Durable insulating body: Designed for long service life.
• Trusted protection: Suitable for sensitive electrical equipment and power systems.
• ROHS compliant: Supports material safety standards.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4J350
  
• Product Series: Amp-Trap® A4J
  
• Fuse Class: Class J
  
• Fuse Type: Fast-Acting
  
• Ampere Rating: 350A
  
• Voltage Rating: 600VAC / 300VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA AC
  
• Current Type: AC/DC
  
• Mounting Type: Clip
  
• Terminal Type: Blade
  
• Terminal Material: Brass Alloy
  
• Body Material: GMG
  
• Product Diameter: 54 mm
  
• Product Length: 181.1 mm
  
• Product Weight: 0.7938 kg
  
• UPC/EAN: 782001960438
  

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.
• Commercial and industrial electrical protection systems: Manufactured for dependable overcurrent protection.
  

Where It Works Best

• The Mersen A4J350 fast-acting fuse is well suited for motor control centers, industrial machinery, HVAC equipment, panelboards, branch circuits, power distribution systems, and other electrical installations where fast overcurrent protection is essential. It is especially useful in environments with high available fault currents where protecting critical equipment and maintaining system uptime are top priorities.