A4J70 - 70 Amp Fuse

A4J70 - 70 Amp Fuse

The Mersen A4J70 Amp-Trap® Class J fuse is designed for electrical systems that need fast protection when overloads or short circuits happen. Rated at 70 amps, this fast-acting fuse helps you interrupt fault current before it can cause larger problems inside the system. In commercial and industrial environments where downtime can affect productivity and equipment repairs can become costly, reliable overcurrent protection is an important part of keeping your operations running safely.

The A4J70 reacts quickly during fault conditions to help reduce stress on motors, HVAC systems, transformers, industrial control panels, and other electrical equipment. Its current-limiting design helps lower the amount of damaging fault energy moving through the circuit, which can help reduce equipment damage and improve overall system protection.

This fuse also features a Class J rejection-style design that helps you 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 blade-style terminals provide secure installation in compatible fuse holders, while the GMG body material is designed for dependable long-term use in demanding operating environments.

With a 600VAC / 300VDC rating and a high 200 kA interrupting capacity, the Mersen A4J70 is commonly used in industrial equipment, branch circuits, OEM machinery, motor control applications, and electrical distribution systems where fast fault interruption is important.

Key Features and Benefits

• 70 amp Class J fast-acting fuse: Helps protect equipment from overloads and short circuits.
• 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.
• Silver-plated copper terminals: Provide dependable conductivity.
• Durable GMG body construction: Designed for dependable long-term use.
• ROHS compliant: Supports environmental compliance requirements.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4J70
  
• Series: Amp-Trap® A4J
  
• Fuse Class: Class J
  
• Fuse Type: Fast-Acting
  
• Amp Rating: 70A
  
• 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: Silver-Plated Copper
  
• Body Material: GMG
  
• Product Diameter: 27 mm
  
• Product Length: 117.6 mm
  
• Product Weight: 0.1089 kg
  
• UPC/EAN: 782001960285
  

Material Compliance and Certifications

• ROHS Compliant: Designed for Low Voltage UL/CSA fuse applications.
• Suitable for industrial and commercial electrical systems: Supports dependable overcurrent protection.
  

Where It Works Best

• The A4J70 works well in HVAC systems, industrial control panels, branch circuits, motor control applications, OEM equipment, manufacturing machinery, 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.