A good solution to this, that was told to me by a man
who
assembled new IMSAIs "back in the day", is to use the bottom
3/4 inch of a Tic-Tac candy box. You get the fuse covered
in plastic but can still see it. It fits tight and will stay
I'ev seen open-type fuseholders with official transparaent plastic
covers. Voth for 20mm and 1~1/4" (is that what you'd call a 3AG fuse)
fuses, and both for chassis mounting and PCB mounting.
I normally use them for any fuse that's carrying significant voltage [1]
or current. It's a lot cheaper than the results of accidentally touching
it or shorting it to something else.
[1] Dor the pedants, a fuse (or anything else) can'r carry a voltage.
What I mean is that there is a significant voltage between the fuse
terminals and the local ground.
-tony