Main is tripping?

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This is my first post and not sure if this is the correct place for it.
The main at my house just tripped. The A/C has been acting up and the landlord had a tech look at it a few days ago and he said it was okay. I went out and re-set the main and noticed that the two pole 50 for the A/C was also tripped.

I do mostly new commercial work and don't know much about service work. Can anyone tell me what may be the problem? The panel is an old ITE 200A.
Thanks.
 
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