HiFI Fuses ?

Ah yes the directionality feature, which might make sense IF the current always flowed in the same direction. Unfortunately AC current changes direction 60 times a second and makes the direction that a so-called 'direction oriented' fuse a moot point.
Its the same principle for speaker cables, the current is AC and therefore direction of cables (except for the grounding or shielding point) does not exist.

Bob P.

Ah yes, directionality would not matter were the connections in the component to not involve ground, but alas they do and so directionality matters. The neutral is not just the opposite flow of the hot. Anyone who has ever reversed the direction of a fuse and heard the difference could have told you this.

It is another matter on speaker wires. Again directionality matters, but that is not the topic here.

Tbg - a well reasoned correction of previous misinformation! Good job...

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Which misinformation? So AC current does not change direction? Ground and neutral are not necessarily the same. Even if the 'directional' fuse were a partial diode, it would act as such in either direction installed since the current reverses as many times as the frequency indicates. Grounding doesn't come into play here.
The last time that I looked at the amplifier output connections to the speaker I saw the voltage swing from positive to negative, therefore the current varying as such. When directionality is shown on cables it is to indicate where the connection for the shield should be, usually at the preamp, not the direction of the current or signal.
Bob P.

I'm with Bob P. on this one. I've yet to read a reasonable explanation for a fuses directional aspect, within any part of an audio cicuit. I'm open to explanations, though.