The guy I bought my trailer from told me one of those breakers kept tripping and he replaced it with a new one (of the same amp size) to solve the regular occurence. If your problem persists, a new breaker may be needed.
Doug & Cindy
2014 36 CKTS: Titan Disc Brakes, EMS, Trav'lr
2016 Ram 3500 CTD 4x4 CCLB DRW: Andersen Alum II, Factory Rear Air Suspension, 3.73