A4J50 - 50 Amp Fuse

A4J50 - 50 Amp Fuse

The Mersen A4J50 Amp-Trap® Class J fuse is built for your electrical systems that need fast protection when overloads or short circuits happen. Rated at 50 amps, this fast-acting fuse helps protect your circuits and connected equipment by interrupting fault current before it can cause larger electrical problems. In commercial and industrial environments where equipment downtime can affect productivity, dependable overcurrent protection is an important part of keeping systems running safely.

The A4J50 reacts quickly during fault conditions to help you reduce stress on motors, control panels, HVAC systems, lighting circuits, transformers, and other electrical components. Its current-limiting design helps lower the amount of damaging fault energy passing through the system, which can help you reduce equipment damage and improve overall system protection.

This fuse also features a Class J rejection-style design that helps prevent incorrect replacement with lower-rated fuses. That added safeguard can help support safer maintenance practices and maintain proper electrical protection throughout the system. The ferrule-style terminals provide secure installation in compatible fuse holders, while the PolyTube body is designed for long-term use in demanding operating environments.

With a 600VAC / 300VDC rating and a high 200 kA interrupting capacity, the Mersen A4J50 is commonly used in industrial equipment, branch circuits, motor control applications, OEM machinery, and electrical distribution systems where fast fault interruption is important.

Key Features and Benefits

• 50 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.
• Ferrule terminal design: Provides secure installation.
• Tin-plated copper terminals: Provide dependable conductivity.
• Durable PolyTube body construction: Designed for long-term performance.
• ROHS compliant: Supports environmental compliance requirements.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4J50
  
• Series: Amp-Trap® A4J
  
• Fuse Class: Class J
  
• Fuse Type: Fast-Acting
  
• Amp Rating: 50A
  
• Voltage Rating: 600VAC / 300VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA AC
  
• Current Type: AC/DC
  
• Mounting Style: Clip
  
• Terminal Type: Ferrule
  
• Terminal Material: Tin-Plated Copper
  
• Body Material: PolyTube
  
• Product Diameter: 27 mm
  
• Product Length: 60.5 mm
  
• Product Weight: 0.0771 kg
  
• UPC/EAN: 782001960247
  

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 A4J50 works well in industrial control panels, HVAC systems, lighting systems, motor control applications, branch circuits, OEM equipment, and electrical distribution systems where fast overcurrent protection is needed. It is especially useful in applications with sensitive electrical components that require quick interruption during overloads and short-circuit conditions to help reduce downtime and equipment damage.