Is my compressor shot?

The check valve may be leaking back into the compressor? If it is it will put pressure on piston causing the breaker to trip. It will also try to push oil out anywhere it can.
Good advice on post above as well. Looks like you have dual capacitors. If one is toast you will pop the breaker. Google how to test a capacitor I believe you check ohms but not sure. YOU MUST discharge energy by touching both connection together with an insulated screw driver to safely discharge any power. If you see a quick spark while doing so then it may be good.