A4J20 - 20 Amp Fuse

A4J20 - 20 Amp Fuse

The Mersen A4J20 Amp-Trap® Class J Fast-Acting Fuse is designed for electrical systems that need quick, reliable protection when faults happen. Rated at 20 Amps, this fuse helps protect your equipment and circuits from overloads and short circuits before they turn into larger electrical problems. Its fast-acting design makes it a solid choice for applications with sensitive equipment where fast interruption is important.

Used in many commercial and industrial systems, the A4J20 provides strong current-limiting protection in a compact Class J design. The smaller footprint helps save space inside panels and switchgear, while the Class J construction also helps prevent lower-rated fuses from being installed accidentally. That extra level of protection can help you improve overall system safety and reliability.

The fuse features tin-plated copper ferrule terminals for dependable conductivity and secure clip mounting. Its durable PolyTube body is built to handle demanding electrical environments found in manufacturing facilities, HVAC systems, control panels, and power distribution equipment. With a high 200 kA interrupting rating, the A4J20 is capable of handling severe fault conditions while helping reduce damage to connected components.

Key Features and Benefits

• 20 Amp Class J fast-acting fuse: Designed for rapid overcurrent protection.
• Quickly responds to overloads and short circuits: Helps protect connected equipment and circuits.
• Current-limiting protection: Helps reduce equipment damage.
• Rated for 600VAC and 300VDC applications: Suitable for AC and DC systems.
• Compact Class J design: Helps prevent incorrect fuse replacement.
• High 200 kA interrupting rating: Designed for severe fault conditions.
• Ferrule terminals: Support secure clip mounting.
• Suitable for AC and DC systems: Designed for multiple electrical applications.
• Designed for commercial and industrial electrical applications: Supports dependable overcurrent protection.
• Helps improve equipment protection and system reliability: Suitable for demanding electrical environments.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4J20
  
• Series: Amp-Trap® A4J
  
• Fuse Class: Class J
  
• Fuse Type: Fast-Acting
  
• Ampere Rating: 20A
  
• AC Voltage Rating: 600VAC
  
• DC Voltage Rating: 300VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA AC
  
• Terminal Type: Ferrule
  
• Mounting: Clip
  
• Terminal Material: Tin-Plated Copper
  
• Body Material: PolyTube
  
• Diameter: 20.7 mm
  
• Length: 57.2 mm
  
• Product Weight: 0.044 kg
  
• Product Group: Low Voltage UL/CSA Fuses
  
• Compliance: RoHS Compliant
  

Material Compliance and Certifications

• RoHS Compliant: The Mersen A4J20 fuse is RoHS compliant, supporting environmental standards for electrical components used in modern industrial and commercial systems.
• UL and CSA Applications: It is designed for low-voltage UL and CSA fuse applications that require dependable overcurrent protection.
  

Where It Works Best

• The A4J20 is commonly used in applications that require fast fault clearing and reliable circuit protection, including industrial control panels, HVAC systems, commercial electrical equipment, manufacturing machinery, branch circuit protection, power distribution systems, motor and control circuits, OEM equipment, and switchgear and panelboards. Its fast-acting performance makes it especially useful in systems where protecting sensitive electrical equipment from overloads and fault currents is a priority.