A4BY1000 - 1000Amp Fuse

A4BY1000 - 1000Amp Fuse

When your electrical system demands serious overcurrent protection, the Mersen A4BY1000 Amp-Trap® Class L Time-Delay Fuse delivers the performance and reliability industrial facilities count on every day. Built for protecting service entrance equipment, feeder circuits, and circuit breakers, this 1000A Class L fuse is designed to handle demanding power distribution environments while helping reduce costly downtime. Its time-delay functionality allows normal startup and inrush currents to pass without unnecessary fuse operation, making it a smart choice for systems with motors, transformers, and other high-inrush equipment.

Whether you are upgrading switchgear, servicing feeder protection, or maintaining critical infrastructure equipment, the Mersen A4BY1000 offers the confidence and protection modern electrical systems require.

Key Features and Benefits

• 1000 Amp Class L fuse designed for high-capacity electrical distribution systems
• Time-delay design helps prevent nuisance openings during motor startup and temporary surge conditions
• 600VAC and 300VDC ratings support a wide range of industrial and commercial applications
• High 200 kA interrupting rating delivers excellent short-circuit protection
• 100% rated fuse allows continuous operation at full ampere capacity
• Silver-plated copper blade terminals improve conductivity and resist corrosion over time
• Bolted mounting configuration provides secure and dependable installation
• Coordinates effectively with ground fault relays and downstream protective devices
• Helps protect service entrance equipment, feeder circuits, and circuit breakers from damaging overcurrent events

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4BY1000
  
• Product Type: Class L Time-Delay Fuse
  
• Series: A4BY Amp-Trap®
  
• Ampere Rating: 1000A
  
• Voltage Rating AC: 600VAC
  
• Voltage Rating DC: 300VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: Class L
  
• Speed / Characteristic: Time Delay
  
• Interrupting Rating: 200 kA AC
  
• Mounting Type: Bolted
  
• Terminal Type: Blade
  
• Terminal Material: Silver-Plated Copper
  
• Body Material: GMG
  
• Product Length: 273 mm
  
• Product Diameter: 63.5 mm
  
• Product Weight: 1.9414 kg
  
• UPC: 782001939144
  

Material Compliance and Certifications

• Manufactured by Mersen, a trusted global leader in electrical power protection solutions
• Designed for use in UL/CSA low-voltage fuse applications
• Suitable for systems requiring high interrupting capacity and coordinated overcurrent protection
• Engineered to meet the performance expectations of demanding commercial and industrial environments
  

Where It Works Best

• Industrial manufacturing facilities
• Commercial electrical distribution systems
• Service entrance protection
• Large feeder circuits
• Motor control centers
• Switchgear and panelboard systems
• Utility and infrastructure projects
• Heavy processing equipment and industrial machinery