Replacement Fuse's - What are my options ????

I am still trying to figure out why the direction of the fuse makes any difference on an AC line where the current reverses itself continuously!

What direction does AC current flow anyway? I think that it reverses its flow 60 times a second, so directionality of fuses seems silly as a concept, but then, so does the whole fuse thing!
Bob P.

TBG, if the current doesn't know how many times per second it reverses, how does it distinguish the direction that the fuse is installed for it to be affected by that direction?
Bob P.

Do the European fuses work as well on 60 Hz power supplies, seeing as they are designed for 50 Hz? This question is probably less silly than if the direction of the fuse is important.
Bob P.

TBG, just because there is "continuity", as you put it, doesn't imply that the current flows in only one direction. AC current, by definition, alternates in its direction and voltage, 60 times a second in North America and 50 times a second in most of the rest of the world.
Now fuses installed on the DC voltage rails might have directionality, but I have my doubts, no matter what the fuse dealers say.
With respect, Bob P.