Blue Sea Systems 5140 50A MAXI Fuse for Marine and Automotive Circuits

The Blue Sea Systems 5140 is a 50 amp MAXI-size blade fuse built for protecting high-current marine and automotive electrical circuits. MAXI fuses are the larger-format blade fuse used where continuous current draw exceeds what a standard ATO/ATC blade fuse can safely handle, making this size common in battery switch panels, bilge pump feeds, windlass circuits, and other heavy-load 12-32 volt DC wiring. The fuse blades are tin-plated to resist the corrosion that saltwater and humid engine-room environments cause on bare metal contacts, helping maintain a solid electrical connection over time. A visible indicator window on the fuse body shows at a glance whether the fuse has blown, so troubleshooting a dead circuit does not require pulling the fuse to inspect it. The housing is molded plastic and the fuse is rated for 32 volts DC, with a 50 amp continuous current rating. This fuse is sold individually, one per package, and installs into any standard MAXI-size fuse holder or fuse block. It is part of Blue Sea Systems' MAXI fuse lineup, which also includes 40A, 60A, 70A, and 80A versions for matching the fuse to the specific circuit load.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 5140
• Current Rating: 50 Amps
• Voltage Rating: 32 Volts
• Mounting Type: Surface Mount (blade style)
• Material: Plastic
• Color: Beige
• Item Dimensions: 9 x 8 x 3 inches
• Weight: 0.04 pounds
• Unit Count: 1 fuse per package
• UPC: 632085051402

Frequently Asked Questions

What amperage is the Blue Sea Systems 5140 fuse rated for? The 5140 is rated for 50 amps continuous current at 32 volts DC, making it suited to high-current marine and automotive circuits.

What size fuse holder does the 5140 fit? This is a MAXI-size blade fuse, so it installs into any standard MAXI fuse holder or MAXI fuse block, not a smaller ATO/ATC-style holder.

How can I tell if the 5140 fuse has blown? The 5140 has a visible indicator window on the fuse body that shows a blown condition, so you can identify a tripped fuse without removing it to test it.

Is the 5140 fuse corrosion-resistant? Yes, the connector blades on the Blue Sea Systems 5140 are tin-plated, which resists the corrosion that saltwater and humid conditions cause on bare metal fuse blades.

What is the 5140 fuse made of? The 5140 has a molded plastic housing in beige, with tin-plated metal blade connectors.

How many fuses come in a package? The Blue Sea Systems 5140 is sold individually, one 50A MAXI fuse per package.

What voltage is the 5140 fuse rated for? It carries a 32 volt DC rating, consistent with standard marine and automotive low-voltage electrical systems.

How much does the 5140 fuse weigh? The Blue Sea Systems 5140 weighs 0.04 pounds.

What other amperages are available in this fuse series? Blue Sea Systems offers the same MAXI fuse body in 40A (part 5139), 50A (part 5140), 60A (part 5141), 70A (part 5142), and 80A (part 5143), so you can match the fuse to your circuit's load.

Can the 5140 be used in automotive as well as marine wiring? Yes, the 50A MAXI fuse format used by the 5140 is common to both marine and automotive high-current circuits.