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Approvals & Standards

  • UL Listed to Standard 248-10, File E2137
  • CSA Certified to Standard C22.2, No. 248.68
  • Self-certified for DC per UL248 (601-2000)

Key features & benefits

The high interrupting rating of the Amp-Trap A4BT current-limiting fuses makes it suitable for protecting mains, feeders, and general circuits. The 10-second time-delay at 500 percent of fuse rating is ideal for large motors and other loads with high inrush currents. A4BT fuses can be applied to normal loads up to its full ampere rating to allow 100percent rating of equipment.

More specifications


  • Motors
  • Motor controllers
  • Transformers
  • Mains
  • Feeders

Product Specifications

Item Number


Item Description (ERP)

L TD FUSE 600V 300A A4BT  

Short Description

Fuse Amp-Trap® 600V 300A Time-Delay Class L A4BT Series  



Rated voltage AC UL

600   V

Rated voltage DC UL

500   V


50/60   Hz

Ampere Rating

300   A

Fuse Class

Class L  


Time Delay  



AC Max I.R./Breaking Capacity: I1

200   kA

Connection/Terminal Material

Silver-Plated Copper  

Connection/Terminal Type


Body/Insulating Material


Product Weight

2   lb

Product Diameter

2   in

Product Length

8.63   in

Sell Pack Quantity

1   Each

Sell Pack Weight

2.1   lb

Sell Pack Width

2.12   in

Sell Pack Length

2.12   in

Sell Pack Height

8.81   in