/diy/ - Do It Yourself

>>681617
>What caused the breaker to look like that any ideas?

long term heat damage to the bakelite case causes the crumbled appearance.
the screw terminal matching the damaged connector also shows more tarnish than it's mate most likely from heat.

Most likely cause was poor electrical connection between the buss and the breaker causing heat. I would expect the male part of that connection (buss in the breaker box) to show discoloration due to heat, and possible obvious fused spots due to intermittent arcing.

>pic related, small arrows show possible arc spots