On Thu, 21 Jan 2016 17:00:40 -0500, Stormin Mormon wrote:

Good catch. and thanks for reminding us that some times the
contact between the breaker and the bar corrodes.

I saw some thing similar in a house, where the double 100
breaker brings the power in was corroded.

I'm gonna replace the 15 amp breaker, no matter what.
Not worth worrying about it *not* tripping when it needs to trip.