As there is no change, new fuses again, 24A load, 13A fuse exceeded 270°C which is all the thermal cam can read, plug too hot to touch and fuse blew at 5 minutes.
24A load, 20A fuse now, at 6 minutes it hasn't blown but has gone brown and is burning the MK plug, the fuse is emitting smoke at 15 minutes.
at 26 minutes the fuse hasn't blown yet it is dangerously hot. The 13A fuse got very hot before it blew, but not to the point of damaging the plug. The plug is burned, the fuse is smoking and it stinks like hell. At these temperatures I would have expected the fuse to have opened by now. Temperature of plug cover is now 170°C Fuse blew after 34 minutes, plug is damaged and not suitable for reuse.
Opening both 13A and 20A fuses they both failed differently.
The 13A fuse appears to have no damage and the fuse element was not visible when broken open.
The 20A fuse appears burnt, the printing has turned black and the ceramic has discoloured, the fuse element was still visible when opened and had just a small gap where it opened, it appeared more as a crack with no sign of balls on the ends of the wire common with melting.