Are you talking about the fuse holder box, which is plastic with metal fuse holders as in your thumbnail or the fuses, which are ceramic?

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81' 300TD
Peter

I am not speaking of the Fuse Box itself.

My Fuse Box did not melt;it just burned the Brass Contact area a little due to the high resistance created by the Corroded end of the Fuse.

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84 300D, 82 Volvo 244Gl Diesel

The problem with my #8 fuse was that the fuse melted the box a little and filled the hole at the end of the fuse holder. One of several things are could be happening 1) the blower is pulling too much current, 2) it's normal for this fuse to get this hot without blowing or 3) the melting was caused a while ago and went unnoticed by whomever was trying to fix the A/C.

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81' 300TD
Peter