Blue Sea 4321 4 Position Panel with USB and Socket

The Blue Sea Systems 4321 is a 4-position circuit breaker switch panel in gray with a 12V socket and dual USB, rated 45A on 12V DC.

The illuminated 15A breakers do three jobs at once: switching, ON indication and overcurrent protection. That combination keeps the panel shallow, and the low profile is what lets it fit spaces where a conventional panel with breakers sitting behind switches will not go.

A 12V socket and dual USB are built into the face, putting phone and tablet charging on a protected circuit rather than on an adapter wedged into a socket somewhere. Silicone breaker boots and a gasket keep water out, and the face is UV stabilized flame retardant polycarbonate and ABS that will not corrode.

Sizes and mounting follow industry standards, so it retrofits into an existing cutout in most cases. Wiring uses fast-on breaker connectors with a simple two-wire feed on M5 or #10 ring terminals to the bus bars. Stainless mounting screws and 15 square format labels are included. Explore more marine electrical panels.

• Breakers switch, indicate and protect in one part
• The shallow depth fits where a normal panel will not
• 12V socket and dual USB on a protected circuit
• Retrofits into a standard existing cutout