Finally, the answer on fuse directionality from Synergistic! Rejoice, ye refuseniks!
from Synergistic web page for the new Blue fuse,
Frequently asked questions.
Q: Are fuses directional?
A: Yes, fuses are directional. Electricity should flow from the left to the right when you view the fuse. If you do not know the direction of flow you should listen to the fuse inserted in both directions. One direction will sound more detailed. This is the correct way.
from Synergistic web page for the new Blue fuse,
Frequently asked questions.
Q: Are fuses directional?
A: Yes, fuses are directional. Electricity should flow from the left to the right when you view the fuse. If you do not know the direction of flow you should listen to the fuse inserted in both directions. One direction will sound more detailed. This is the correct way.