Sounds to me like it wants you to use a different sized fuze when you switch to 110 v. This makes sense since for the same power, current doubles.
Voltage is pretty much irrelevant on a fuse so you can still use a 250v fuse in a 110 system and indeed, that seems to be what the first sentence requires.
So my thought would be to use a 250V rated fuse of 5 amp, slow blow.
Which is what is in it.
Did you blow a fuse?
Jerry