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Large (100, 125 and 150) Federal breakers are notorious for not being able to handle loads, once they have tripped a few times.
My rule of thumb was to replace, once the breaker has tripped the third time.

On a side note, I think you are opening yourself up to a liability problem if you are troubleshooting the elevator controls. .
Can’t electricians work on elevators up north?
 

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Only the power to them can be done by electricians. Elevator mechanics do the rest.

I had a call where there was no power to the elevator. Found 2 blown 90 amp fuses. Fuses do not blow without reason very often so I expected something wrong with the elevator equipment. I Supplied 3 new fuses but told them I won’t energize my side unless I could first disconnect the elevator equipment (the load) but it is their equipment so they need to do it.
elevator guy was coming later and told them all he needed was the fuses and I could leave.

Couple hours later they call and say the elevator guy energized, the motor blew up and the elevator guy was trying to blame me. Good thing I did all the work with their maintenance watching/ helping and I had documentation of what I did.
There were 9 or 10 elevators in the paper mill. I got to work on them all. There was even a man lift. That thing was the best people moving machine!
 
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