A4BT1800 - 1800 Amp Fuse

A4BT1800 - 1800 Amp Fuse

When your electrical systems demand serious overcurrent protection, the Mersen A4BT1800 Amp-Trap® Class L Time-Delay Fuse delivers the performance and reliability industrial facilities depend on every day. Built for high-capacity power distribution applications, this 1800A Class L fuse is designed to protect mains, feeders, switchgear, transformers, and large motor circuits from damaging overloads and short circuits. Its time-delay functionality allows temporary inrush currents during motor startups or equipment energization to pass without unnecessary fuse operation, helping reduce downtime and maintain productivity.

The A4BT1800 also features advanced current-limiting protection that reacts quickly during fault conditions to help minimize potential equipment damage and improve overall system safety.

Key Features and Benefits

• 1800 Amp Current Rating designed for high-capacity industrial and commercial electrical systems
• Class L Time-Delay Protection helps prevent nuisance openings caused by temporary startup surges
• Current-Limiting Design helps reduce potential damage during short-circuit events
• Rated for 600VAC and 500VDC applications
• 200 kA interrupting capacity supports protection in high fault-current environments
• Bolted blade terminal connection provides secure installation and dependable conductivity
• Silver-plated copper terminals help resist corrosion and improve electrical performance
• Allows 100% continuous loading under normal operating conditions
• Ideal for protecting motors, feeders, switchgear, transformers, and power distribution systems

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4BT1800
  
• Product Type: Class L Time-Delay Fuse
  
• Series: A4BT Amp-Trap®
  
• Ampere Rating: 1800A
  
• AC Voltage Rating: 600VAC
  
• DC Voltage Rating: 500VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: Class L
  
• Speed / Characteristic: Time Delay
  
• Interrupting Rating: 200 kA AC
  
• Terminal Type: Blade
  
• Mounting Style: Bolted
  
• Terminal Material: Silver-Plated Copper
  
• Body / Insulating Material: GMG
  
• Product Length: 273 mm
  
• Product Diameter: 88.9 mm
  
• Product Weight: 3.6877 kg
  

Material Compliance and Certifications

• RoHS Compliant for environmentally conscious installations
• Designed for UL low-voltage fuse applications
• Suitable for both AC and DC circuit protection systems
  

Where It Works Best

• Industrial manufacturing plants
• Commercial power distribution systems
• Motor control centers
• Large HVAC equipment and compressors
• Utility and infrastructure projects
• Switchboards and panelboards
• Heavy-duty feeder circuits
• Data centers and mission-critical facilities
• Electrical systems with high available fault current