Blue Sea Systems — Compact ST Blade Fuse Block, 4 Circuit — BSS-5045

Blue Sea Systems Compact ST Blade Fuse Block, 4 Circuit (5045)

This Blue Sea Systems 5045 is a compact common-source fuse block that accepts ATO and ATC fast-acting blade fuses across four circuits, with single-side entry wiring that helps keep the installation tidy where space is tight. Tin-plated copper buses and fuse clips carry the current, and the ignition-protected design meets ISO 8846 and SAE J1171 for use in a gasoline engine compartment.

Part Details

• Brand: Blue Sea Systems
• Manufacturer part number: 5045
• Product type: Compact ST blade fuse block, 4 circuit
• Fuses: Accepts ATO and ATC fast-acting blade fuses
• Wiring entry: Single side entry
• Terminals: Accepts ring or snap-fork type terminals
• Construction: Tin-plated copper buses and fuse clips
• Sold as: each (pack of 5)

Key Features

• Compact common-source fuse block with four circuits
• Accepts ATO and ATC fast-acting blade fuses
• Single-side entry wiring
• Ignition protected — meets ISO 8846 and SAE J1171 for use in a gasoline engine compartment
• Insulating cover meets ABYC and USCG insulation requirements
• Tin-plated copper buses and fuse clips
• Accepts ring or snap-fork type terminals

Compatible Applications

• Boat electrical circuits protected by ATO or ATC blade fuses
• Installations in gasoline engine compartments where ignition-protected components are required, as covered by ISO 8846 and SAE J1171

Technical FAQ

• What fuses does it take? ATO and ATC fast-acting blade fuses.
• Can it be installed in a gasoline engine compartment? It is ignition protected and meets ISO 8846 and SAE J1171, which cover use in a gasoline engine compartment.
• What terminals fit? Ring or snap-fork type terminals.

Also Available

• Blue Sea Systems Ato/atc Fuse Blocks - Ato Fuse Block 6-CIRCUIT | 5028 — the same ATO/ATC fuse block family in a 6-circuit layout. This listing is a draft in our store, so it may not be available to shoppers yet.
• Blue Sea Systems Ato/atc Fuse Blocks - Ato Fuse Block 12-CIRCUIT | 5029 — the same ATO/ATC fuse block family in a 12-circuit layout.
• Blue Sea 5243100 Fuse ATO/ATC 20 Amp 25/Pk — ATO/ATC fuses for this style of block, sold separately.

Parts Desk Insights

• Best use case: Adding tidy four-circuit distribution for ATO/ATC blade fuses where space is limited, including installations in gasoline engine compartments covered by the ignition-protection listings.
• Most common customer mistake: Ordering a fuse block without confirming the fuse style. This block takes ATO and ATC fast-acting blade fuses only, so check the fuse style and the number of circuits needed before ordering.
• Sizing and fitment guidance: Confirm the fuse types and terminal style (ring or snap-fork), plan the wiring around single-side entry, and match the amperage of each fuse to the circuit it protects.