Mike, It's hard to say what caused the bus bar to arc, it just happens over time. Moisture could have caused it, electrolysis, who knows? The bad connection between the breaker and bus bar caused excessive heat and that's what caused the breaker to trip. The heat also weakened the way the breaker pinched the bus bar and the more heat caused more arking.
If the problem continues, you have 2 choices. One is to replace the load center and the other is to use a second 100 amp breaker as your main and back feed through the second breaker to power your load center. The first is the best choice.
Were both sides of the main bad? If only one side was bad, you may try shifting the large 110v circuits to the good side.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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