Blue Sea Systems 5032 ST-Blade Split Bus Fuse Block, 12-Circuit Dual with Ground and Cover

The Blue Sea Systems 5032 is a 12-circuit ST-Blade split bus fuse block built for 12V DC marine electrical systems that need two electrically isolated groups of circuits from a single mounting point. The block provides two isolated groups of six ATO/ATC blade fuse circuits each, making it suited either for wiring from two separate isolated batteries or for splitting a single battery into a mix of 24-hour (always-on) circuits and switched circuits. Each circuit is rated for up to 30 amps, with a total of 100 amps per block and a maximum voltage of 32V DC.

Wiring connects via screw terminals that accept ring terminals, with #8-32 screws and captive star lock washers securing the circuit connections and a #10-32 stud screw terminal on the negative bus. The block mounts using #8 screws (M4). Current-carrying buses and fuse clips are tin-plated copper for corrosion resistance and reliable conductivity, while one-piece stainless steel flange nuts secure the connections. A clear insulating cover snaps on with an easy-to-open push button latch, includes label recesses for circuit identification, and has built-in storage for two spare fuses. The cover satisfies ABYC/USCG insulation requirements for enclosed electrical connections aboard a boat. Fuses are not included and are sold separately.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 5032
• Circuits: 12 (two isolated groups of 6)
• Maximum Amperage: 100 amps per block, 30 amps per circuit
• Maximum Voltage: 32 volts DC
• Mounting: #8 screw (M4)
• Negative Bus Terminal: #10-32 stud
• Circuit Terminal Type: #8-32 screws with captive star lock washer
• Material: Tin-plated copper bus and fuse clips; stainless steel flange nuts
• Cover: Clear insulating cover with label recesses and storage for two spare fuses
• Compliance: Meets ABYC/USCG insulation requirements
• Weight: 0.75 pounds

Frequently Asked Questions

How many circuits does the Blue Sea Systems 5032 fuse block have? The 5032 has 12 total ATO/ATC blade fuse circuits, arranged as two isolated groups of six circuits each.

Why is this called a split bus fuse block? The 5032 splits its 12 circuits into two electrically isolated buses, so it can be wired to two separate batteries or used to separate 24-hour circuits from switched circuits on a single battery.

What is the maximum amperage the 5032 fuse block can handle? The block is rated for 100 amps total, with each individual circuit rated up to 30 amps, at a maximum of 32 volts DC.

Does the Blue Sea Systems 5032 come with fuses installed? No. Fuses are sold separately from the 5032 fuse block; the block itself includes storage space in the cover for two spare fuses.

What size wire terminals does the 5032 use? Circuit connections use #8-32 screws with a captive star lock washer and accept ring terminals, while the negative bus uses a #10-32 stud terminal.

How is the Blue Sea Systems 5032 fuse block mounted? It mounts using #8 screws (M4 equivalent).

Is the 5032 fuse block ABYC and USCG compliant? Yes, the clear insulating cover on the 5032 satisfies ABYC/USCG insulation requirements for boat wiring.

What material are the bus bars and fuse clips made of? The 5032 uses tin-plated copper bus bars and fuse clips, with one-piece stainless steel flange nuts securing the connections.

How does the cover on the 5032 work? The clear cover uses a push button latch for easy access to the fuses, includes label recesses for marking circuits, and has built-in storage for two spare fuses.

How much does the Blue Sea Systems 5032 fuse block weigh? The 5032 weighs 0.75 pounds.

Can the 5032 be used with a single battery instead of two? Yes, the split bus design of the 5032 allows it to run off a single battery while still separating circuits into a 24-hour group and a switched group.