Blue Sea 5052 ST CLB Circuit Breaker Block - 6 Position w/Negative Bus

The Blue Sea 5052 ST CLB Circuit Breaker Block with 6 positions and negative bus is the marine and mobile electrical standard for distributing 12/24-volt DC power across multiple independent circuits. Built by Blue Sea Systems, a brand trusted for over 50 years in marine, RV, and industrial electrical applications, this circuit breaker block delivers the compact, reliable load management that demands precision in saltwater environments and demanding off-grid installations where electrical failures create safety risks.

The 6-position block accepts standard automotive and marine circuit breakers rated for marine-grade applications, with tin-plated copper busses and screw terminals engineered to resist corrosion in high-moisture conditions. Quick-connect clips allow breakers to snap securely into place without soldering, while the integrated negative bus consolidates ground returns into a single point—critical for minimizing ground loops and voltage drops across multiple consumer circuits. The clear insulating cover with label recesses satisfies ABYC (American Boat and Yacht Council) and USCG (U.S. Coast Guard) insulation requirements, meeting regulatory standards for certified marine electrical systems. Breakouts allow wire access in two directions, and the easy-to-open clip on cover simplifies troubleshooting and breaker replacement without full disassembly.

This unit serves mariners, RV operators, off-grid homeowners, and industrial technicians who require failsafe circuit distribution in environments where salt spray, vibration, and thermal cycling accelerate component degradation. The block accepts ring terminals for permanent installations and is compatible with optional waterproof boots, making it suitable for exposed mounting in engine compartments, battery boxes, and exterior electrical enclosures. At 0.9 lbs with compact 5 × 3 × 11-inch footprint, the 5052 fits retrofit installations in confined spaces without sacrificing electrical capacity or safety margin.