Extract from https://www.synergisticresearch.com/fuses/blue/
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.
Q: Do fuses have a burn in period?
A: Yes, most products have a settling in period. The first 200-300 hours of use are the most crucial.