Blue Sea 4321 4 Position Panel with USB and Socket

The Blue Sea 4321 Circuit Breaker Switch Panel is a 4-position panel built for exposed mounting with a 12V socket and dual USB ports built right in. It is designed for boaters who want switching, breaker protection, and device charging in one low-profile, drop-in panel.

Illuminated 15A circuit breakers handle switching, ON indication, and overcurrent protection in one part, and industry-standard sizing means the panel retrofits easily into an existing cutout. Silicone breaker boots and a gasket protect against water ingress, and a simple two-wire connection with #10 ring terminals powers the whole panel. Browse more options in our panels, switches, and circuit breakers category.

Key Features: 4 illuminated 15A circuit breaker positions, built-in 12V socket and dual USB ports, rated 45A maximum, low-profile design, silicone water-ingress protection, includes 15 square format labels, sold individually.

Frequently Asked Questions

Does this panel charge USB devices? Yes, it has a built-in 12V socket and dual USB ports.

Are the circuit breakers illuminated? Yes, illuminated 15A breakers provide switching, ON indication, and overcurrent protection.

Will this fit an existing panel cutout? Yes, it uses industry-standard sizes and mounting for easy retrofitting.