Blue Sea 7458 UL-489 Circuit Breaker - 30A Flat Rocker. Reliable UL-489 Certified Protection for Marine AC Systems. The Blue Sea 7458 UL-489 Circuit Breaker - 30A Flat Rocker is built for dependable performance in demanding marine electrical environments. Meeting UL-489 specifications, it is approved for Navy, Army, Coast Guard, and vessels covered under CFR 46. This breaker ensures precise protection against overloads and short circuits while integrating seamlessly into Blue Sea 360 panel syste