Blue Sea 7459 UL-489 Circuit Breaker - 50A Flat Rocker

The Blue Sea 7459 UL-489 Circuit Breaker – 50A Flat Rocker is a magnetic-hydraulic, trip-free circuit protection device engineered specifically for marine electrical systems operating under Code of Federal Regulations 46 compliance. This 50-amp AC breaker meets strict UL-489 specifications required for Navy, Army, and Coast Guard vessel installations, making it the standard choice for serious marine and offshore applications where regulatory certification is non-negotiable.

The 7459 is rated for 240V AC maximum and features a single-pole configuration with a flat rocker actuator for positive, intuitive switching under rough sea conditions. The #10-32 screw terminal connection uses tin-plated brass contacts, selected specifically to resist corrosion from salt air and moisture exposure—a critical consideration in marine environments where standard brass terminals fail prematurely. The magnetic-hydraulic trip mechanism delivers reliable fault detection without nuisance disconnects, essential when protecting critical vessel systems. The trip-free design ensures the breaker cannot be held in the ON position during an overcurrent event, preventing dangerous scenarios where a stuck switch could mask an active fault.

This breaker is specified for vessels covered under CFR 46—commercial and military maritime craft requiring federal compliance. Operators and marine electricians select this model when replacing factory protection devices or upgrading electrical systems on patrol boats, research vessels, or other craft subject to Coast Guard inspection. The 50-amp capacity handles moderate-to-high draw circuits typical of marine auxiliary systems, engine controls, and safety equipment without oversizing protection.

The Blue Sea 7459 is compact (3" × 2" × 5") and weighs just 0.25 lbs, fitting standard marine panel enclosures without modification. Its reputation for reliability stems from Blue Sea Systems' long-standing focus on marine-grade electrical components—a brand trusted across military, commercial fishing, and offshore industries for 40+ years.