Audio Grade fuses


I dont know much about the fuses, so I need a little help.
I have been reading a lot about the Isoclean audio grade fuses, so I looked at my Myryad amp fuses which says "T3. 15A" But I couldnt find the same number on the Isoclean fuse website.

All they have are Sizes: 5 x 20mm (.2" x .79") 1A, 1.6A, 2A, 2.5A, 3A, 4A, 5A, 6.3A, 8A, 10A...But my original fuses are also in 5x20mm, but it is rated at 15A, so would I be able to replace them with the Isoclean?
thanaphan
Finally I found out that T3. 15A is a slow burn 3.15a fuse which is 220v. the Isoclean does not have the 3.15a though.
You should use the 4A fuse, because audiophile fuses will blow a little sooner than their official rating.
"You should use the 4A fuse, because audiophile fuses will blow a little sooner than their official rating."

Would it be okay to use a different rate? I dont have any knowledge about this at all...:)
I use the 3 amp Isoclean fuse in my Fisher 500C receiver which originally had a 3.25 Amp fuse.