Blue Sea Systems 5139 MAXI Fuse, 40 Amp Blade-Style Fuse

The Blue Sea Systems 5139 is a 40 Amp MAXI blade-style fuse designed to protect boat wiring circuits from overcurrent damage. Its larger-format blade design handles higher amperage loads than standard ATO/ATC blade fuses, making it a common choice for higher-draw circuits on a boat's DC electrical system. The fuse uses a through-hole mounting style and features tin-plated connector blades that resist the corrosion common in marine environments, helping maintain a reliable electrical connection over time. A visible indication of blown condition lets you quickly identify a tripped fuse without needing a multimeter, speeding up troubleshooting at the panel. The housing is constructed of a synthetic material sized at 5 x 3 x 1 inches. Each Blue Sea Systems 5139 is rated for 40 Amps maximum current. This fuse is intended for use in circuits calling for a 40 Amp MAXI-size fuse and should be matched to the correct in-line fuse holder and wire gauge for the circuit being protected.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 5139
• Current Rating: 40 Amps
• Fuse Style: MAXI Blade-Style
• Mounting Type: Through-Hole Mount
• Material: Synthetic
• Item Dimensions: 5 x 3 x 1 inches
• Weight: 0.04 pounds
• UPC: 632085051396
• Blown-Fuse Indicator: Visible indication of blown condition
• Connector Blades: Tin-plated for corrosion resistance

Frequently Asked Questions

What amperage is the Blue Sea Systems 5139 fuse rated for? The Blue Sea Systems 5139 is rated for 40 Amps maximum current.

Is the 5139 a standard blade fuse or a larger format? It is a MAXI-style blade fuse, a larger-amperage blade format than standard ATO/ATC fuses, designed for higher-draw circuits.

How do I know if the 5139 fuse has blown? The fuse includes a visible indication of blown condition, so you can identify a tripped fuse by sight without testing it with a meter.

What material is the Blue Sea Systems 5139 made from? The 5139 fuse body is made of synthetic material.

What are the dimensions of the 5139 MAXI fuse? The 5139 measures 5 x 3 x 1 inches.

How much does the Blue Sea Systems 5139 fuse weigh? The 5139 weighs 0.04 pounds.

How is the 5139 fuse mounted? It uses a through-hole mounting type, fitting standard MAXI in-line fuse holders.

Will the connector blades corrode on a boat? The 5139's connector blades are tin-plated for corrosion resistance, which helps them hold up in a marine electrical environment.

What is the UPC for the Blue Sea Systems 5139 fuse? The UPC for the 5139 40 Amp MAXI fuse is 632085051396.

Does the 5139 come with a fuse holder? The 5139 is the fuse itself; a separate MAXI in-line fuse holder sized for the correct wire gauge is needed to install it.

What other amperages are available in this MAXI fuse line? The 40 Amp 5139 is part of a MAXI fuse lineup that also includes other amperage ratings for different circuit loads.