{"product_id":"sierra-fs40740-ato-atc-fuse-block-160a-ground-bus","title":"Sierra FS40740 ATO\/ATC Fuse Block, 160A Ground Bus","description":"\u003cp class=\"nvn-hero\"\u003eThe Sierra FS40740 puts your fused positive circuits and their grounds on one tidy panel. It runs standard ATO\/ATC blade fuses, carries a built-in ground bus bar, and handles 30 amps per circuit up to 160 amps total at 12V DC. Tin-plated copper terminals and a flame-resistant base make it a clean, corrosion-fighting choice for rewiring a helm.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eWiring up a boat means running a lot of small circuits back to one place. Nav lights, the bilge pump, a stereo, a chartplotter, the livewell pump. Each one wants its own fuse, and each one needs a clean ground. The Sierra FS40740 fuse block handles both jobs on one panel. It takes standard ATO\/ATC blade fuses and carries a ground bus bar right alongside the fused positive side, so your hot and ground terminations land in the same tidy spot instead of scattered around the bilge.\u003c\/p\u003e\n\u003cp\u003eThe block is rated for 30 amps maximum per circuit and 160 amps total at 12 volts DC, and the individual circuits are good from 12 to 24 volts DC. That covers just about every accessory load on a typical center console, cuddy, or small trawler. The base is molded from flame-resistant reinforced polyester, and the tab terminals are 1\/4-inch tin-plated copper, which is what you want in salt air. Tin plating fights corrosion far better than bare brass or steel, and it keeps your connections low-resistance over the long haul.\u003c\/p\u003e\n\u003cp\u003eHere's how most folks wire it. The main feed comes into the block's power stud, then each fused output feeds one accessory circuit. The ground bus bar gives every one of those circuits a matching negative landing, so you're not daisy-chaining grounds or hunting for a spare terminal. One caution from the crew who install these all day: size your main feed wire for the real load. If you expect to pull anywhere near the block's full rating, run heavy cable to the stud, up to 2\/0 AWG for loads approaching 160 amps. Undersized feed wire is the number one cause of heat and voltage drop at a fuse block, and it's an easy mistake to avoid.\u003c\/p\u003e\n\u003cp\u003eIn practice, very few boats ever pull the full 160 amps continuously. Add up your actual simultaneous loads and you'll usually land under 100 amps, which gives you plenty of headroom. The rating is there so you don't have to think twice about a big momentary draw like a wiper motor or a windlass solenoid sharing the same panel.\u003c\/p\u003e\n\u003cp\u003eA couple of real-world install tips. Blade fuses can back out slightly under constant vibration, so a dab of dielectric grease on the tabs and a torque check after the first ten hours of running keeps everything tight and dry. If you're mounting to a metal surface or an aluminum boat, use insulated standoffs so the ground side can't short against the hull. And if your block came with a clear snap-on cover, keep an eye on it after a season or two in salt air. Covers can trap moisture, so a little ventilation or a fresh cover down the road goes a long way toward keeping the terminals bright.\u003c\/p\u003e\n\u003cp\u003eInstallation is straightforward. The block mounts with two screws, the terminals accept standard 1\/4-inch ring or spade connectors, and the interlocking design keeps the whole assembly rigid once it's fastened down. Label your circuits as you go. Future you, troubleshooting a dead nav light at the dock on a Friday evening, will thank present you.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Anyone rewiring a helm, adding a bank of accessories, or cleaning up a rat's nest of inline fuses under the dash. It's a workhorse block for center consoles, walkarounds, pontoons, and smaller cruisers. If you're building out a larger powerboat that needs 200 amps or more of distribution, you'll want a bigger panel, but for the accessory loads on most boats under 30 feet, this Sierra block is exactly the right size.\u003c\/p\u003e\n\u003cp\u003eOne more thing worth knowing. ATO and ATC blade fuses are the same standard automotive-size fuse you'll find at any parts counter or marine store, so replacements are cheap and easy to carry as spares. Keep a small assortment aboard in the amperages your circuits call for, and you'll never be stuck. Sierra builds its electrical gear to meet or beat the original equipment it replaces, which is why you'll find their parts on plenty of factory-rigged boats.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eATO\/ATC blade fuse compatibility uses cheap, easy-to-find standard fuses you can stock as spares\u003c\/li\u003e\n  \u003cli\u003e160 amp total capacity at 12V DC with 30 amps maximum per circuit for plenty of accessory headroom\u003c\/li\u003e\n  \u003cli\u003eIntegrated ground bus bar lands every circuit's negative right beside its fuse, no scattered grounds\u003c\/li\u003e\n  \u003cli\u003e1\/4-inch tin-plated copper tab terminals resist corrosion in salt air and hold low resistance\u003c\/li\u003e\n  \u003cli\u003eFlame-resistant reinforced polyester base stands up to heat and the marine environment\u003c\/li\u003e\n  \u003cli\u003eIndividual circuits rated 12 to 24 volts DC for both standard and higher-voltage house systems\u003c\/li\u003e\n  \u003cli\u003eInterlocking module design keeps the assembly rigid once it's mounted\u003c\/li\u003e\n  \u003cli\u003eTwo-screw mounting and standard 1\/4-inch connectors make for a straightforward install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sierra Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat kind of fuses does the Sierra FS40740 use?\u003c\/summary\u003e\n    \u003cp\u003eIt's built for standard ATO\/ATC blade fuses, the same automotive-size blade fuses sold at any parts counter. That makes replacements cheap and easy to keep aboard as spares.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the amperage rating?\u003c\/summary\u003e\n    \u003cp\u003eEach circuit handles up to 30 amps, and the whole block is rated for 160 amps total at 12 volts DC. The individual circuits are good from 12 to 24 volts DC.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with a ground bus bar?\u003c\/summary\u003e\n    \u003cp\u003eYes. The ground bus bar is built into the block, so every fused positive circuit has a matching negative landing right beside it. There's no need to run a separate ground bar.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size wire should I use for the main feed?\u003c\/summary\u003e\n    \u003cp\u003eSize the main feed cable to your real load. For loads approaching the block's full 160 amp rating, run heavy cable up to 2\/0 AWG to the power stud. Undersized feed wire is the most common cause of heat and voltage drop at a fuse block.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it on a 24-volt system?\u003c\/summary\u003e\n    \u003cp\u003eThe individual circuits are rated from 12 to 24 volts DC, so it works on both standard 12V systems and 24V house banks. The 160 amp total rating is specified at 12V DC.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat terminals does it use?\u003c\/summary\u003e\n    \u003cp\u003eThe tab terminals are 1\/4-inch tin-plated copper. They accept standard 1\/4-inch ring or spade connectors, and the tin plating fights corrosion in salt air.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it okay for saltwater boats?\u003c\/summary\u003e\n    \u003cp\u003eYes. The base is flame-resistant reinforced polyester and the terminals are tin-plated copper, both good choices for the marine environment. If your block has a clear cover, add a little ventilation or plan to refresh it after a couple of seasons so it doesn't trap moisture on the terminals.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I keep the fuses from loosening with vibration?\u003c\/summary\u003e\n    \u003cp\u003eA dab of dielectric grease on the tabs helps, and it's worth re-checking the connections after the first ten hours of running. Blade fuses can back out slightly under constant vibration, so a quick torque check keeps everything tight and dry.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I mount it on an aluminum boat?\u003c\/summary\u003e\n    \u003cp\u003eYou can, but use insulated standoffs so the ground side can't short against a metal hull. On a fiberglass boat you can mount it directly with the two mounting screws.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size boat is this block right for?\u003c\/summary\u003e\n    \u003cp\u003eIt's a great fit for center consoles, walkarounds, pontoons, and smaller cruisers, basically any boat under about 30 feet where you're wiring accessory loads. If you need 200 amps or more of distribution on a larger powerboat, step up to a bigger panel.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003e160 Ampere; With Ground Bus Bar; For ATO\/ATC Fuses\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eFS40740\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e808282367275\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFuse Type\u003c\/th\u003e\n\u003ctd\u003eATO\/ATC blade fuses\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTotal Block Rating\u003c\/th\u003e\n\u003ctd\u003e160 Amps at 12V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePer-Circuit Rating\u003c\/th\u003e\n\u003ctd\u003e30 Amps maximum at 12V to 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eGround Bus Bar\u003c\/th\u003e\n\u003ctd\u003eIntegrated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminal Type\u003c\/th\u003e\n\u003ctd\u003e1\/4-inch tin-plated copper tab terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBase Material\u003c\/th\u003e\n\u003ctd\u003eFlame-resistant reinforced polyester\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eVoltage Range\u003c\/th\u003e\n\u003ctd\u003e12V to 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eInterlocking snap-together modules\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What kind of fuses does the Sierra FS40740 use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's built for standard ATO\/ATC blade fuses, the same automotive-size blade fuses sold at any parts counter. That makes replacements cheap and easy to keep aboard as spares.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the amperage rating?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Each circuit handles up to 30 amps, and the whole block is rated for 160 amps total at 12 volts DC. The individual circuits are good from 12 to 24 volts DC.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come with a ground bus bar?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The ground bus bar is built into the block, so every fused positive circuit has a matching negative landing right beside it. There's no need to run a separate ground bar.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size wire should I use for the main feed?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Size the main feed cable to your real load. For loads approaching the block's full 160 amp rating, run heavy cable up to 2\/0 AWG to the power stud. Undersized feed wire is the most common cause of heat and voltage drop at a fuse block.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it on a 24-volt system?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The individual circuits are rated from 12 to 24 volts DC, so it works on both standard 12V systems and 24V house banks. The 160 amp total rating is specified at 12V DC.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What terminals does it use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The tab terminals are 1\/4-inch tin-plated copper. They accept standard 1\/4-inch ring or spade connectors, and the tin plating fights corrosion in salt air.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it okay for saltwater boats?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The base is flame-resistant reinforced polyester and the terminals are tin-plated copper, both good choices for the marine environment. If your block has a clear cover, add a little ventilation or plan to refresh it after a couple of seasons so it doesn't trap moisture on the terminals.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I keep the fuses from loosening with vibration?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A dab of dielectric grease on the tabs helps, and it's worth re-checking the connections after the first ten hours of running. Blade fuses can back out slightly under constant vibration, so a quick torque check keeps everything tight and dry.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I mount it on an aluminum boat?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"You can, but use insulated standoffs so the ground side can't short against a metal hull. 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If you need 200 amps or more of distribution on a larger powerboat, step up to a bigger panel.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Sierra Marine","offers":[{"title":"Default Title","offer_id":45074728321117,"sku":"2009524","price":34.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_cd8693a6-a7e6-4c34-bb7f-4417e097035e.jpg?v=1789814600","url":"https:\/\/nvnmarine.com\/products\/sierra-fs40740-ato-atc-fuse-block-160a-ground-bus","provider":"NVN Marine","version":"1.0","type":"link"}