Blue Sea Systems 5045 ST Blade Fuse Block, Compact 4-Circuit, 100 Amp, 32V DC

The Blue Sea Systems 5045 is a compact ST blade fuse block that provides four fused outputs for organizing and protecting DC branch circuits aboard boats, RVs, and other 12V/24V systems. Its surface-mount design places all terminals on one side, which reduces the installation footprint and simplifies wire routing in tight dashboards, consoles, and electrical panels. The block is rated for a maximum operating voltage of 32V DC and a maximum operating amperage of 100 amps per block, with the included clear insulating cover shielding energized terminals from accidental contact while leaving room for circuit identification. Write-on circuit labels are included for each of the four circuits, and small format standard and custom labels are also available separately for further identification. The block accepts standard ATO or ATC blade fuses, which are sold separately, and connects using #8-32 screw terminals with a captive star lock washer to keep wiring secure under vibration. It mounts with a #8 screw (M4). Internally, tin-plated copper buses and fuse clips resist corrosion and maintain reliable conductivity in marine and other demanding environments. The 5045 meets ISO 8846 and SAE J1171 external ignition protection requirements, making it suitable for use in gasoline engine spaces. It is a straightforward, professional-grade way to add organized, protected DC circuit distribution to a panel or console.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 5045
• Number of Circuits: 4
• Maximum Operating Voltage: 32 volts DC
• Maximum Operating Amperage: 100 amps per block
• Amperage per Circuit: Up to 30 amps
• Fuse Type: ATO or ATC blade fuses (sold separately)
• Screw Terminal: #8-32 screws with captive star lock washer
• Mounting: #8 screw (M4)
• Regulatory Compliance: Meets ISO 8846 and SAE J1171 external ignition protection requirements
• Dimensions: 3.64 inches wide x 1.28 inches high
• Weight: 0.25 pounds
• Material: Plastic housing with tin-plated copper buses
• Included Components: Fuse block, cover, 4 write-on circuit labels

Frequently Asked Questions

How many circuits does the Blue Sea Systems 5045 fuse block have? The 5045 has four individually fused circuits, letting you distribute and protect power to four separate DC accessories or systems from one compact block.

What is the maximum amperage rating of the 5045 fuse block? It is rated for a maximum of 100 amps per block, with up to 30 amps supported on each of the four individual circuits.

What type of fuses does the Blue Sea Systems 5045 use? It accepts standard ATO or ATC blade fuses, which are sold separately and can be matched to the amperage needs of each circuit.

What voltage systems is the 5045 fuse block designed for? The block has a maximum operating voltage of 32V DC, making it suitable for standard 12V and 24V marine, automotive, and RV electrical systems.

Does the 5045 come with a cover? Yes, a clear insulating cover is included that shields the terminals from accidental contact while still allowing space for circuit labels.

How do I identify which fuse controls which circuit? The 5045 includes write-on circuit labels for each of the four circuits, and Blue Sea Systems also offers small format standard and custom labels separately for additional identification.

How does the 5045 mount and connect to wiring? It mounts using a #8 screw (M4) and terminates with #8-32 screw terminals fitted with a captive star lock washer to keep connections secure under vibration.

Is the Blue Sea Systems 5045 ignition protected? Yes, it meets ISO 8846 and SAE J1171 external ignition protection requirements, which is important for installation in or near gasoline engine compartments.

What is the 5045 fuse block made of? The housing is plastic, and the internal buses and fuse clips are tin-plated copper for corrosion resistance and reliable long-term conductivity.

What are the dimensions and weight of the 5045? The 5045 measures 3.64 inches wide by 1.28 inches high and weighs 0.25 pounds.

Are fuses included with the 5045 block? No, ATO or ATC fuses are sold separately from the 5045 fuse block and cover assembly.

What is included when I order part number 5045? The 5045 ships as a fuse block with its insulating cover and four write-on circuit labels.