Try to figure out when it will trip. If its on start-up, theres 2 things to look at first. The Start Capacitor could be getting weak. You can change them out. Second, most AC's have a timer circuit (or device) that keeps the compressor from restarting after less than 3-5 mins because of the head pressure. If the compressor tried to restart with too high a head, it will pull excessive amounts of current.