Fuse for power distribution system of electric automobile, power distribution system and electric automobile

The utility model relates to a fuse for a power distribution system of an electric automobile, the power distribution system and the electric automobile. The fuse comprises a fusion tube which comprises a cylindrical main body with two open transverse ends and end covers which are connected to the two transverse ends of the cylindrical main body to close the cylindrical main body; each fuse body extends in the cylindrical main body along the transverse direction, and the two transverse ends of each fuse body are respectively connected to the adjacent end covers; the arc extinguishing filler is filled into the cylindrical main body and wraps the at least one melt; each melt comprises at least one row of variable cross-section parts which are distributed at intervals in the transverse direction, and each row of variable cross-section parts comprises at least four punched holes which are distributed at intervals in the longitudinal direction perpendicular to the transverse direction, so that at least three narro