Blue Sea 5065 ATO/ATC Waterproof Fuse Holder

The Blue Sea 5065 ATO/ATC Waterproof Fuse Holder is an essential electrical protection component for any serious angler or boater running modern marine systems. Whether you're powering navigation electronics, trolling motors, or accessory circuits on a center console, coastal cruiser, or bass boat, this fuse holder safeguards your equipment from dangerous electrical faults while remaining completely protected from the corrosive saltwater and spray environment. Built by Blue Sea Systems—a name trusted across the marine industry for decades—this unit delivers the reliability you need when you're miles offshore or navigating shallow coastal waters.

The waterproof design is engineered specifically for marine conditions where moisture, salt exposure, and constant vibration can degrade standard electrical components. The fuse holder accommodates both ATO and ATC fuse types, giving you flexibility across different circuit configurations on your vessel. Its sealed housing prevents water intrusion into the fuse cavity and terminal connections, eliminating corrosion that would otherwise compromise conductivity and create voltage drop issues—a critical concern when running sensitive fish finders, GPS plotters, or lighting systems that demand stable power delivery. The compact, lightweight construction (0.75 lbs) makes installation straightforward in tight panel spaces without adding unnecessary weight to your boat's electrical system.

This fuse holder suits both new boat builds and retrofit electrical upgrades, particularly when upgrading from older systems or adding new circuits for modern fish-finding technology, autopilot systems, or auxiliary power distribution. Professional marine electricians and experienced boat owners choose Blue Sea products because they integrate seamlessly into standardized marine electrical architecture and comply with ABYC (American Boat and Yacht Council) standards. Installation typically requires only basic terminal connections to your 12V or 24V DC system and is compatible with standard marine-grade wiring practices and breaker panels found on recreational vessels of all sizes.