1.5A 25V fuse w/ leads

Showing my dumbness: how critical are voltage ratings on fuses? Since the fuse has close to no voltage drop across it, it seems as if the voltage is really none of its business until it blows, and even then it just needs to have enough dielectric strength to be sure it really won't conduct, and I would think any glass tube would be OK up to many hundreds of volts ... Unless what we're really talking about is the film of former fuse filament (the F.F.F.F.) that flashed onto the inside of the tube when the fuse blew. Which seems very fancy. In any case am I wrong in thinking a fuse can be used at *far* lower than its rated voltage w/o ill effects? 25V seems like an oddball rating which would be dumb to pay extra for when a 125V or 250V fuse would work. John Wilson D Bit