A3T400 - 400Amp Fuse

A3T400 - 400Amp Fuse

The Mersen A3T400 Amp-Trap® Class T Fuse is made for your electrical systems that need quick, dependable protection from overloads and short circuits. Rated at 400 amps, this fast-acting fuse helps protect equipment before a fault has the chance to cause larger problems or expensive downtime.

Its compact Class T design is one of the reasons it’s widely used in commercial and industrial applications. It provides strong current-limiting protection while taking up less space inside electrical equipment and panels. The fuse body is made from glass melamine material for added stability, and the copper blade terminals provide a solid connection during operation.

The A3T400 is commonly installed in switchboards, panelboards, motor control centers, UPS systems, and other power distribution equipment where your reliable circuit protection is important. With a 200 kA interrupting rating, it is designed to handle high available fault currents found in demanding electrical environments.

Key Features and Benefits

• Fast-acting design helps clear faults quickly
• High current limitation helps protect connected equipment
• Compact Class T construction saves panel space
• 400 amp rating for commercial and industrial systems
• 200 kA interrupting rating for high fault-current applications
• Glass melamine body provides long-term stability
• Copper blade terminals support dependable electrical contact
• Permanent markings on the blades simplify identification
• Suitable for AC and DC applications

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A3T400
  
• Product Type: Class T Fast-Acting Fuse
  
• Ampere Rating: 400A
  
• Voltage Rating AC: 300VAC
  
• Voltage Rating DC: 160VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: Class T
  
• Fuse Speed: Fast-Acting
  
• Interrupting Rating: 200 kA AC
  
• Mounting Type: Bolted
  
• Terminal Type: Blade
  
• Terminal Material: Copper
  
• Body Material: GMG Glass Melamine
  
• Product Diameter: 33.8 mm
  
• Product Length: 69.8 mm
  
• Product Weight: 0.1234 kg
  

Material Compliance and Certifications

• RoHS Compliant
• Designed for UL/CSA low-voltage fuse applications
• Rated for AC and DC circuit protection
  

Where It Works Best

The Mersen A3T400 fuse is a practical choice for applications that require fast fault protection and reliable performance, including:

• Industrial control panels
• Motor control centers
• UPS systems
• Commercial power distribution equipment
• Switchboards and panelboards
• HVAC equipment
• Renewable energy systems
• Manufacturing facilities
• DC power applications                                                                                                             
• Its combination of compact sizing, fast response, and high interrupting capacity makes the A3T400 a dependable solution for protecting electrical systems and connected equipment in demanding environments.