Blue Sea 5129 200A ANL Fuse

The Blue Sea 5129 200A ANL Fuse is a high-capacity inline fuse designed for marine DC electrical systems, particularly those with large battery banks requiring robust main circuit protection. This 200-ampere fuse delivers the 6,000 ampere interrupt capacity (AIC) required by ABYC standards for primary battery protection on serious offshore and cruising vessels.

Built to handle the harsh marine environment, the 5129 features ignition protection compliant with SAE J1171, making it safe for gasoline-powered boats where electrical arc ignition hazards must be eliminated. Silver-plated connector blades resist corrosion from salt spray and humidity—a critical feature in systems where oxidation directly degrades electrical reliability. The visible blow indicator provides instant confirmation of fuse failure without requiring multimeter testing, allowing crew to quickly identify and respond to electrical faults. Installation requires Blue Sea Systems' ANL Fuse Blocks, which are industry-standard mounting hardware for this fuse format.

This fuse is engineered for serious boaters running high-draw systems—multiple engines, large battery banks, inverters, and complex electronics aboard fishing vessels, cruising sailboats, and commercial boats. The 200-amp rating handles main feeder circuits where undersized or inadequate protection can lead to catastrophic battery discharge, fire risk, or complete electrical system failure during critical offshore conditions. Proper sizing and reliable response from ANL fuses are non-negotiable for safety and system longevity.