Blue Sea Systems 5023 ST Blade Battery Terminal Fuse Block, 4-Circuit, 100 Amp

The Blue Sea Systems 5023 is an ST Blade battery terminal fuse block that mounts directly onto a battery stud, giving DC electrical systems four individually fused circuits from a single compact point. It is built for marine, RV, and vehicle 32 volt DC systems where multiple accessory circuits need to branch off the battery with reliable overcurrent protection close to the power source.

Each of the four positions accepts a standard ATO or ATC blade-style fuse, with the block rated for up to 30 amps per circuit and 100 amps total across the block. The fuse block is molded from polycarbonate with tin-plated copper terminals for corrosion resistance, and it is compliant with ISO 8846 for use in installations near gasoline engines and fuel systems. An insulating cover is included to protect the live terminals and provide a surface for labeling each circuit, and four nylon insulated ring terminals plus one fuse are included so a first circuit can be wired immediately.

Because it mounts on the battery terminal stud itself, the 5023 shortens the unfused run of wire from the battery, which is a common wiring best practice for reducing fire risk on any circuit that is not already protected close to the source.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 5023
• Number of Circuits: 4
• Fuse Type: ATO or ATC blade fuse
• Fuse Amperage Range: 1-30 Amps
• Voltage Rating: 32 Volts DC
• Maximum Amperage per Circuit: 30 Amps
• Maximum Amperage per Block: 100 Amps
• Mounting Type: Battery terminal stud
• Material: Polycarbonate (PC), tin-plated copper
• Included Components: Fuse block, insulating cover, 4 nylon insulated ring terminals, 1 fuse
• Dimensions: 3.59 inches W x 1.28 inches H
• Weight: 0.25 pounds
• Compliance: ISO 8846
• UPC: 632085050238

Frequently Asked Questions

How many circuits does the Blue Sea Systems 5023 fuse block provide? The 5023 provides four separately fused circuits from a single battery-mounted block, each protected by its own ATO or ATC blade fuse.

What size fuses does the 5023 use? It accepts standard ATO or ATC blade-style automotive fuses, in ratings from 1 amp up to 30 amps per circuit.

How does the 5023 mount? It mounts directly on a battery terminal stud, which shortens the unprotected wire run between the battery and the fuse block compared to a remotely mounted block.

What is the maximum current rating of the block? The Blue Sea Systems 5023 is rated for 100 amps total across the block, with up to 30 amps allowed on any single circuit.

Is a cover included to protect the terminals? Yes, an insulating cover is included with the 5023 to shield the live terminals and provide a place to label each circuit.

What is included in the box with the 5023? The package includes the fuse block, an insulating cover, four nylon insulated ring terminals, and one fuse.

What material is the 5023 fuse block made of? The block body is molded polycarbonate with tin-plated copper terminals for corrosion resistance in a marine or automotive DC electrical system.

Is the 5023 rated for gasoline engine compartments? Yes, the 5023 complies with ISO 8846, the standard covering electrical equipment for use in gasoline engine and fuel vapor environments.

What voltage system is the 5023 designed for? It is rated for 32 volt DC systems, covering standard 12 volt and 24 volt marine, RV, and vehicle electrical setups.

Does the 5023 include ring terminals for wiring? Yes, four nylon insulated ring terminals are included so the included circuits can be wired without sourcing separate terminals.

How is the 5023 different from Blue Sea's ST-Glass fuse blocks? The 5023 is part of the ST Blade line and uses ATO or ATC blade fuses, while Blue Sea's ST-Glass fuse blocks use AGC or MDL glass tube fuses instead.

How much does the 5023 fuse block weigh? The Blue Sea Systems 5023 weighs 0.25 pounds.