BLUE SEA Circ Brkr Block ST CLB 12circ w/gnd Circuit Breaker The BLUE SEA Circ Brkr Block ST CLB 12circ w/gnd is a 12-circuit circuit breaker block constructed from marine-grade plastic, designed for marine electrical systems with a ground bus for enhanced safety. This unit is intended for installation in recreational and commercial vessels to protect electrical circuits from overloads. Compatibility & Applications Fits mounting locations in engine compartments and electrical panels. Pairs with Blue Sea circuit breakers for comprehensive electrical distribution. Mounts on vessels ranging from 20 to 40 ft in length. Replaces older circuit breaker panels like the Blue Sea 5053 series. Wires to NMEA 2000 networks for integrated system monitoring. Integrates with 12V DC electrical systems for seamless operation. The unit provides reliable circuit protection and is suited for installation in both recreational and commercial vessels. Its design allows for a straightforward upgrade from older models, ensuring improved safety and compliance. For instance, it can be installed in the engine compartment of a 30 ft center console boat, enhancing circuit management and safety protocols.