Blue Sea 5033 ST Blade Fuse Block w/out Cover - 6 Circuit w/out Negative Bus

The Blue Sea Systems 5033 ST Blade Fuse Block without Cover is a 6-circuit marine electrical distribution component engineered for reliable power management in demanding saltwater and freshwater boating environments. This compact fuse block accepts standard ATO and ATC fast-acting blade fuses, making it a straightforward upgrade or replacement solution for vessels requiring modular circuit protection without the added complexity of a full negative bus arrangement.

Built with tin-plated copper buses and fuse clips, the 5033 delivers a 30-ampere rating per circuit—sufficient capacity for the auxiliary loads found on most recreational and commercial fishing vessels. The tin-plating provides superior corrosion resistance in marine applications where salt spray and humidity accelerate oxidation of bare copper. The absence of a protective cover keeps the footprint minimal, a practical advantage when space behind the helm is at a premium. Six independent circuits allow organization of distinct electrical systems—navigation, autopilot, fish finders, aerator pumps, lighting, and auxiliary accessory circuits—each with individual fuse protection.

This fuse block suits both weekend anglers upgrading older panel installations and serious offshore operators building modular electrical architectures. The design is equally at home in center consoles, cabin cruisers, and trawlers where reliability and code compliance matter. No negative bus means simplified installation when existing grounding schemes already consolidate negative returns, reducing redundancy and potential ground-loop complications in complex marine DC systems.

Note: This product may expose you to di(2-ethylhexyl)phthalate (DEHP), a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.p65warnings.ca.gov.