A4J90 - 90 Amp Fuse

A4J90 - 90 Amp Fuse

The Mersen A4J90 Amp-Trap® Class J Fuse is built for electrical systems that need dependable protection without taking up unnecessary space in the panel. Rated for 90 amps and designed with a fast-acting response, this fuse helps protect circuits and equipment from damaging short circuits and overloads before they become bigger problems. It’s a solid choice for commercial buildings, industrial equipment, HVAC systems, motor circuits, and power distribution applications where reliability matters every day.

One thing electricians and maintenance teams appreciate about the A4J90 is how quickly it reacts during fault conditions. That fast response can help reduce damage to connected equipment and minimize costly downtime. The compact Class J design also helps prevent the wrong fuse from being installed in the system, adding another level of protection for your electrical setup.

Mersen designed this fuse with silver-plated copper terminals for strong conductivity and long service life, while the durable insulating body stands up well in demanding environments.

Whether you're replacing an existing fuse or maintaining critical electrical infrastructure, the A4J90 offers the performance and protection professionals expect from the Amp-Trap® series.

Key Features and Benefits

• Fast-acting fuse: Helps quickly clear overloads and short circuits.
• 90 amp rating: Designed for industrial and commercial electrical systems.
• Class J current-limiting protection: Helps improve equipment safety.
• Rated for 600VAC and 300VDC applications: Suitable for AC and DC systems.
• High 200 kA interrupting capacity: Designed for demanding environments.
• Compact blade-style design: Fits Class J fuse holders.
• Silver-plated copper terminals: Help improve conductivity.
• Rejection-style Class J dimensions: Help prevent incorrect fuse replacement.
  

Technical Specifications

• Catalog Number: A4J90
  
• Series: A4J – Class J – Fast-Acting
  
• Manufacturer: Mersen
  
• Ampere Rating: 90A
  
• Voltage Rating AC: 600VAC
  
• Voltage Rating DC: 300VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: Class J
  
• Interrupting Rating: 200 kA AC
  
• Terminal Type: Blade
  
• Terminal Material: Silver-Plated Copper
  
• Mounting Type: Clip
  
• Body Material: GMG
  
• Length: 117.6 mm
  
• Diameter: 27 mm
  

Material Compliance and Certifications

• RoHS Compliant: Suitable for low-voltage UL/CSA fuse applications.
• Manufactured for commercial and industrial circuit protection systems: Designed for dependable overcurrent protection.
  

Where It Works Best

• The A4J90 fuse works well in a wide range of applications, including:
• Industrial control panels
• HVAC equipment
• Motor protection circuits
• Transformers and feeder circuits
• Manufacturing equipment
• Commercial power distribution systems
• High fault-current applications requiring fast-acting protection