A3T40 - 40Amp Fuse

A3T40 - 40Amp Fuse

The Mersen A3T40 fast-acting Class T fuse is a compact circuit protection solution built for equipment that needs quick response during overloads and short circuits. Rated at 40 amps, it helps to protect your electrical systems by interrupting fault currents before damage spreads to connected components. Its compact footprint is especially useful in panels and equipment where space is tight but reliable protection is still a priority.

Designed for both AC and DC applications, the A3T40 uses a glass melamine body for good dimensional stability and long service life. The fast-acting design makes it a good fit for protecting sensitive electrical equipment, while the ferrule connection style allows for secure clip mounting. Mersen also stamps the catalog number directly onto the fuse for easier identification during inspections or replacement work.

From industrial controls to commercial power distribution equipment, the A3T40 is commonly used in systems where dependable overcurrent protection and fast fault clearing are important to daily operation.

Key Features and Benefits

• Fast-acting protection helps reduce damage during fault conditions
• Compact Class T design saves space inside electrical equipment
• High current-limiting performance for sensitive components
• Rated for both AC and DC applications
• Durable glass melamine body construction
• Ferrule terminals support secure installation
• Permanent markings simplify maintenance and identification
• High interrupting capacity for demanding electrical systems

Technical Specifications

• Catalog Number: A3T40
  
• Series: A3T – Class T – Fast-Acting
  
• Amp Rating: 40A
  
• Voltage Rating: 300VAC / 160VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200kA AC
  
• Fuse Class: Class T
  
• Characteristic: Fast-Acting
  
• Terminal Type: Ferrule
  
• Terminal Material: Copper
  
• Mounting Type: Clip
  
• Body Material: GMG (Glass Melamine)
  
• Diameter: 14.2 mm
  
• Length: 22.4 mm
  
• Weight: 0.0091 kg
  

Material Compliance and Certifications

• RoHS Compliant
• Designed for low-voltage UL/CSA fuse applications
• Manufactured for commercial and industrial electrical protection systems
  

Where It Works Best

• Industrial control panels
• Motor control centers
• Commercial power distribution systems
• HVAC equipment
• UPS and backup power systems
• Automation and manufacturing equipment
• Renewable energy systems
• DC power applications