Blue Sea 5140 50AMP MAXI Fuse

The Blue Sea 5140 50AMP MAXI Fuse is a heavy-duty electrical protection component engineered for marine DC power systems where reliability under load is non-negotiable. Designed to protect high-amperage circuits on boats ranging from center console fishing platforms to offshore cruisers, this 50-amp fuse interrupts power cleanly when electrical faults occur, preventing fire risk and equipment damage in demanding saltwater environments.

The 5140 features tin-plated connector blades that resist corrosion from the constant moisture and salt spray exposure inherent to marine installations. This coating maintains reliable electrical contact over years of service, a critical factor in systems where corroded connections can cause voltage drop, starting failures, or dangerous arcing. The fuse includes a visible indication window that clearly shows blown condition—eliminating guesswork during troubleshooting in the field. At compact dimensions (2 x 1 x 4 inches) with minimal weight, the MAXI fuse integrates cleanly into engine room layouts and electrical panel arrangements without requiring extended rewiring.

This fuse is specified for high-capacity DC circuits protecting main alternators, windlasses, thrusters, and integrated galley/cabin loads on larger vessels. Weekend fishermen operating single-engine boats benefit from its economical cost, while serious offshore operators appreciate the proven Blue Sea Systems engineering and industry-standard MAXI form factor recognized across OEM and aftermarket marine electrical installations. Whether replacing a blown fuse during a fishing trip or upgrading aging electrical protection, the 5140 delivers consistent, verifiable performance.

WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.p65warnings.ca.gov.