A4BT800 - 800 Amp Fuse

A4BT800 - 800 Amp Fuse

The Mersen A4BT800 Class L Time-Delay Fuse is made for your electrical systems that can’t afford unnecessary downtime. Built for demanding commercial and industrial applications, this 800A fuse helps protect mains, feeders, and power distribution circuits from overloads and short circuits while still allowing the temporary startup surge common with large motors and heavy equipment. That time-delay feature helps your equipment start smoothly without nuisance fuse operation, which is especially important in high-load environments.

This Amp-Trap® Class L fuse also delivers strong fault protection with a 200 kA interrupting rating, helping you reduce the impact of severe electrical faults before damage spreads through the system. Its silver-plated copper blade terminals support efficient conductivity and reliable connections, and the bolted mounting style keeps the fuse securely in place in switchgear and other distribution equipment. Rated for both AC and DC systems, the A4BT800 is a dependable choice for facilities that need consistent circuit protection day after day.

Key Features and Benefits

• 800A Class L time-delay fuse for industrial and commercial applications
• Helps protect electrical systems from overloads and short circuits
• Time-delay performance allows temporary motor startup surges without unnecessary opening
• Current-limiting design helps reduce damage during fault conditions
• Rated for 600VAC and 500VDC systems
• 200 kA interrupting rating for high fault-current protection
• Silver-plated copper blade terminals for dependable conductivity
• Bolted mounting design for secure installation
• Supports 100% rated loading under normal operating conditions

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4BT800
  
• Series: A4BT Amp-Trap®
  
• Product Type: Class L Time-Delay Fuse
  
• Ampere Rating: 800A
  
• Rated Voltage AC: 600VAC
  
• Rated Voltage DC: 500VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: Class L
  
• Characteristic: Time Delay
  
• Interrupting Rating: 200 kA AC
  
• Mounting Type: Bolted
  
• Terminal Type: Blade
  
• Terminal Material: Silver-Plated Copper
  
• Body Material: GMG
  
• Product Diameter: 76.2 mm
  
• Product Length: 219.2 mm
  
• Product Weight: 1.6919 kg
  

Material Compliance and Certifications

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

Where It Works Best

• The A4BT800 is commonly used in switchgear, motor control centers, HVAC equipment, industrial machinery, feeders, and large commercial power distribution systems. It’s a solid fit for applications where equipment draws heavy startup current and reliable overcurrent protection is essential.