It could be a couple of things. First, keep the breaker off. Next, go outside to the condenser and pull off the cover on the control panel. Inspect the dual run capacitor for any bulging. Next, follow the wires from the contactor to the compressor. This will mean that you'll have to remove the top cover of this condenser. Remove the plastic cover off of the compressor, and inspect the wire terminals. Sometimes I see a failed wire connector, which will cause a wire to fall off and short across another wire. If these wires look good inside the compressor cover, then remove the 3 wires, and ohm from the copper pipe to any of the 3 terminals on the compressor. If you read any resistance, then you have a failed compressor.