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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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