SamuelCB:
if my project takes 4 amps then maybe a 5 amp fuse?
If your project only requires 4 amps, then why would you put in a fuse with 3x the current rating?
You must not like the project very much. 
SamuelCB:
if my project takes 4 amps then maybe a 5 amp fuse?
If your project only requires 4 amps, then why would you put in a fuse with 3x the current rating?
You must not like the project very much.