Why fuse wire are always thin? All Questions › Category: Electrical Estimating And Costing › Why fuse wire are always thin? 0 Vote Up Vote Down Chetan Shidling asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down Akshay answered 4 years ago It depends on connected load. If the load is of 5 amps then the fuse wire will be thin. If the load is of 20 amps then the fuse wire will be four times more thicker then 5 amps fuse wire.