A device is Fused while it has at least one fuse marker.
When a device would detonate, if it is fused, one fuse marker is removed from that device instead, and that device does not detonate.
Interaction with Mines[]
If a ship would move through and/or overlap a fused Mine, one fuse marker is removed from the mine and it does not detonate, even if the ship remains physcially on top of the mine after the fuse marker is removed.
If a ship is physically on top of a mine that did not detonate because of the effect of a fuse marker, and it moves through and/or overlaps that mine again during a later move, the mine detonates as normal.