{"product_id":"qbp423747","title":"Blue Sea Systems ST Blade Compact Fuse Block, 100A, 32V DC, ATO\/ATC","description":"\u003ch6\u003eOverview\u003c\/h6\u003e\u003cp\u003eThe Blue Sea Systems ST Blade Compact Fuse Block is a surface-mount fuse block for consolidating ATO and ATC blade-fuse branch circuits in a compact boat electrical panel. It is rated for up to 100A per block and 30A per circuit, with a maximum voltage of 32V DC, making it appropriate for common 12V and 24V DC marine distribution work.\u003c\/p\u003e\u003cp\u003eThis fuse block is useful when electronics, pumps, lighting, accessories, or other low-voltage DC loads need organized protection without a row of separate in-line fuse holders. The single-side wiring layout lets conductors enter from one side, which helps in tight helm consoles, lockers, cabin panels, and engine-room electrical spaces where clean service access matters.\u003c\/p\u003e\u003cp\u003eWith the cover secured, the block is ignition protected for gasoline engine compartments under ISO 8846 and SAE J1171. The insulating cover also supports ABYC and USCG insulation requirements, while tin-plated copper buses and fuse clips help maintain good conductivity in damp marine environments.\u003c\/p\u003e\u003ch6\u003eKey features\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003eAccepts ATO and ATC fast-acting blade fuses for common marine DC branch circuits.\u003c\/li\u003e\n\u003cli\u003eAvailable in 4-circuit and 8-circuit configurations for different panel sizes and accessory counts.\u003c\/li\u003e\n\u003cli\u003eRated to 100A per block, 30A per circuit, and 32V DC for 12V and 24V boat systems.\u003c\/li\u003e\n\u003cli\u003eSingle-side wire entry helps reduce the footprint inside small consoles, lockers, and distribution panels.\u003c\/li\u003e\n\u003cli\u003eIgnition protected when the cover is secure, with ISO 8846 and SAE J1171 compliance for gasoline engine compartment use.\u003c\/li\u003e\n\u003cli\u003eInsulating cover meets ABYC and USCG insulation requirements for safer exposed-terminal protection.\u003c\/li\u003e\n\u003cli\u003eTin-plated copper buses and fuse clips support clean current flow and help resist corrosion.\u003c\/li\u003e\n\u003cli\u003eAccepts ring terminals or snap fork terminals for flexible wiring during new installations or refits.\u003c\/li\u003e\n\u003cli\u003eUses #8 screw mounting, #8-32 screw terminals with captive star lock washers, and a #10-32 terminal stud.\u003c\/li\u003e\n\u003cli\u003eFuses are sold separately, allowing each circuit to be fused to the load and wire size used on board.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eVariants\u003c\/h6\u003e\u003cp\u003eThis ST Blade Compact Fuse Block is offered in two circuit-count configurations. Both versions use the same compact common-source fuse block concept for ATO and ATC blade fuses.\u003c\/p\u003e\u003cp\u003eThe main difference between the variants is the number of protected branch circuits. The current ratings, 32V DC maximum voltage, ignition-protected construction with the cover secured, terminal style, and single-side wiring layout remain consistent across the two configurations.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e5045: 4-circuit configuration. This version keeps four fused branch circuits grouped in a small footprint, which works well for focused accessory panels, compact helm upgrades, or limited DC distribution additions.\u003c\/li\u003e\n\u003cli\u003e5046: 8-circuit configuration. This version doubles the number of available fused circuits while keeping the same compact wiring approach, which helps when several electronics, lighting, pump, or accessory circuits need to be organized in one location.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eInstallation and fit\u003c\/h6\u003e\u003cp\u003eThe block mounts with #8 screws or M4 hardware on a flat surface. The single-side entry layout is helpful when the fuse block is placed along the edge of a panel or bulkhead, since the wiring can be dressed from one direction rather than crossing around the block.\u003c\/p\u003e\u003cp\u003eTerminals should be matched to the conductor size and circuit load, using ring or snap fork terminals as appropriate. The terminal stud torque is 24 in-lb, and the screw terminal torque is 18 in-lb, so installation should be tightened carefully without overloading the hardware.\u003c\/p\u003e\u003ch6\u003eElectrical and system integration\u003c\/h6\u003e\u003cp\u003eThis is a common-source fuse block, so it is used for positive DC branch-circuit distribution rather than for combined positive and negative bus organization. Each branch circuit should use an ATO or ATC fuse sized for the connected load and the installed wire gauge.\u003c\/p\u003e\u003cp\u003eFor serviceability, the write-on circuit labels help identify each protected circuit at a glance. That matters on boats where quick troubleshooting at the dock or underway can save time, especially around navigation electronics, pumps, lighting, communications gear, and accessory loads.\u003c\/p\u003e\u003ch6\u003eUse cases on board\u003c\/h6\u003e\u003cp\u003eThe 4-circuit version is a good match for smaller accessory additions or a focused sub-panel, while the 8-circuit version suits a larger group of fused DC loads in one place. Both versions fit well in refits where older in-line fuse holders need to be replaced with a cleaner and easier-to-service layout.\u003c\/p\u003e\u003cp\u003eBecause the unit is ignition protected when the cover is secured, it can be used in gasoline engine compartment applications where the installation otherwise follows the vessel’s electrical layout and applicable marine wiring practices.\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"4 Circuit","offer_id":52023078977717,"sku":"QBP423747-V1","price":42.99,"currency_code":"USD","in_stock":true},{"title":"8 Circuit","offer_id":52023079010485,"sku":"QBP423747-V3","price":82.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1333437_qbp423747.webp?v=1780191673","url":"https:\/\/www.qualityboatparts.com\/products\/qbp423747","provider":"Quality Boat Parts","version":"1.0","type":"link"}