{"product_id":"blue-sea-7312-bss-15a-a-series-toggle-circuit-breaker","title":"Blue Sea 7312-BSS 15A A-Series Toggle Circuit Breaker","description":"\u003cp class=\"nvn-hero\"\u003eThe Blue Sea Systems 7312-BSS is a 15-amp A-Series toggle circuit breaker built for the marine environment. It's a double-pole, magnetic-hydraulic unit rated 277 volts AC and 65 volts DC, and it meets the military specifications called out under CFR 46. If you're protecting a 120-volt AC branch or switching both legs on a panel, this is the breaker that does it cleanly.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Blue Sea Systems 7312-BSS is a 15-amp A-Series toggle circuit breaker, and it's the kind of part that quietly does its job for years once you wire it in. This is a double-pole unit with a magnetic-hydraulic trip mechanism, rated for 277 volts AC and 65 volts DC. It uses a simple toggle actuator, so you flip it on and off by hand, and it works as a switch and a breaker in one spot on the panel.\u003c\/p\u003e\n\u003cp\u003eHere's why the magnetic-hydraulic design matters. A lot of cheaper breakers use a thermal element, a bimetal strip that bends with heat. That works fine on a workbench. But put it in an engine room where ambient temperatures climb past 40 degrees C and a thermal breaker starts tripping on heat alone, not on actual overcurrent. That's a nuisance trip, and it's maddening when it kills a circuit that was never overloaded. A magnetic-hydraulic breaker trips on current, not on temperature, so it holds steady in a hot compartment and only opens when the load genuinely exceeds 15 amps. On a boat, that's the difference between a breaker you trust and one you curse.\u003c\/p\u003e\n\u003cp\u003eThe 7312-BSS is a double-pole breaker, which means it opens two legs at once. On a 120-volt AC branch, that lets you switch and protect both the hot and the neutral together, and it's the standard way to build an AC main disconnect on a marine panel. Single-pole units only break one leg, and on vessels inspected under CFR 46 that's often a fail. This breaker is built for use when military specifications are called out under CFR 46, so it's the right choice when your survey or your build spec demands it. When an inspector is walking your panel, having the correct double-pole part already in place saves you a headache and a re-do.\u003c\/p\u003e\n\u003cp\u003eWiring it in is straightforward. The terminals are #10-32 screw studs, so you land #10 AWG ring terminals on them and torque to roughly 12 to 15 inch-pounds. Don't gorilla it. Those threads strip if you overtighten, and a stripped stud on a breaker means a new breaker. Snug and correct beats cranked-down every time. Give the toggle a couple of cycles when it's brand new too. Some of these feel a little stiff out of the box and loosen up to easy one-handed flipping after two or three throws.\u003c\/p\u003e\n\u003cp\u003eThe dual voltage rating tells you where this fits. The 277-volt AC rating covers 120 and 240-volt shore-power and genset circuits with plenty of margin. The 65-volt DC rating covers 12 and 24-volt house systems comfortably. If you're running a 48-volt bank or higher, confirm your arc-suppression needs before you spec it, but for the vast majority of boats on 12 or 24 volts, you've got room to spare.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Boatbuilders and riggers wiring AC panels, trawler and cruiser owners upgrading a shore-power distribution setup, and anyone maintaining a commercial or inspected vessel that has to meet CFR 46. It pairs cleanly with 30-amp shore-power inlets feeding 15-amp branch loads, just size your neutral wiring to match. It's not the part you'd reach for on a tiny 12-volt accessory circuit where a small panel-mount breaker would do. This is a heavier-duty, panel-grade AC and DC breaker meant for the main distribution side of the electrical system.\u003c\/p\u003e\n\u003cp\u003eBlue Sea Systems builds this line specifically for the marine environment, where salt, vibration, and heat chew up gear that wasn't designed for it. If you're mounting on a high-vibration sailboat, a lock washer under the mounting nut is cheap insurance against any chatter over a long passage. Otherwise, land it, torque it, and forget it. That's what a good breaker should let you do. And because it's a single unit, you can buy exactly the number of poles your panel layout needs, no more and no less.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e15-amp rating protects AC and DC branch and main circuits from overcurrent\u003c\/li\u003e\n  \u003cli\u003eMagnetic-hydraulic trip responds to current, not heat, so it holds steady in engine rooms past 40 degrees C\u003c\/li\u003e\n  \u003cli\u003eDouble-pole design opens both legs at once for 120-volt AC mains and CFR 46 compliance\u003c\/li\u003e\n  \u003cli\u003e277-volt AC rating covers 120 and 240-volt shore-power and generator circuits\u003c\/li\u003e\n  \u003cli\u003e65-volt DC rating covers 12 and 24-volt house systems with margin\u003c\/li\u003e\n  \u003cli\u003eToggle actuator works as both a manual switch and a breaker in one panel position\u003c\/li\u003e\n  \u003cli\u003e#10-32 screw terminals accept #10 AWG ring terminals for a secure, serviceable connection\u003c\/li\u003e\n  \u003cli\u003eBuilt for use when military specifications are called out under CFR 46\u003c\/li\u003e\n  \u003cli\u003eMarine-grade Blue Sea Systems construction engineered for salt, heat, and vibration\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 Blue Sea Systems 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 does the magnetic-hydraulic trip do that a thermal breaker doesn't?\u003c\/summary\u003e\n    \u003cp\u003eIt trips on actual current instead of heat. In a hot engine room past 40 degrees C, a thermal breaker can trip on ambient temperature alone. This one holds steady and only opens when the load truly exceeds 15 amps.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy is this a double-pole breaker?\u003c\/summary\u003e\n    \u003cp\u003eDouble-pole opens two legs at once. On a 120-volt AC circuit that lets you switch and protect both the hot and the neutral together, which is the standard way to build an AC main and is required on many CFR 46 inspected vessels.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does CFR 46 compliance mean here?\u003c\/summary\u003e\n    \u003cp\u003eCFR 46 covers the U.S. rules for commercial and inspected vessels. This breaker is built for use when military specifications are called out under CFR 46, so it's the right pick when your build spec or survey demands it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size wire and terminals does it take?\u003c\/summary\u003e\n    \u003cp\u003eThe terminals are #10-32 screw studs. Land #10 AWG ring terminals on them and torque to about 12 to 15 inch-pounds. Don't overtighten, because the threads can strip.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use this on my 12 or 24-volt DC system?\u003c\/summary\u003e\n    \u003cp\u003eYes. The 65-volt DC rating covers 12 and 24-volt house systems with margin. For 48-volt banks or higher, confirm your arc-suppression needs first.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it work as a switch too?\u003c\/summary\u003e\n    \u003cp\u003eYes. The toggle actuator lets you turn the circuit on and off by hand, so it's a breaker and a manual switch in one panel position.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eThe toggle feels stiff. Is something wrong?\u003c\/summary\u003e\n    \u003cp\u003eNo, that's normal on a new unit. Cycle it two or three times and it loosens up to easy one-handed operation.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the AC voltage rating good for?\u003c\/summary\u003e\n    \u003cp\u003eIt's rated to 277 volts AC, which covers 120 and 240-volt shore-power and generator circuits with plenty of margin.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it fit my existing panel?\u003c\/summary\u003e\n    \u003cp\u003eIt uses the standard Blue Sea A-series panel cutout, but check that your panel has room for the double-pole width before ordering.\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\u003eBlue Sea Systems 7312-BSS A-Series Toggle Circuit Breaker\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eBlue Sea Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e7312-BSS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e632085073121\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAmperage\u003c\/th\u003e\n\u003ctd\u003e15 Ampere\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAC Voltage Rating\u003c\/th\u003e\n\u003ctd\u003e277 Volt AC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDC Voltage Rating\u003c\/th\u003e\n\u003ctd\u003e65 Volt DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePoles\u003c\/th\u003e\n\u003ctd\u003eDouble Pole\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTrip Type\u003c\/th\u003e\n\u003ctd\u003eMagnetic Hydraulic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eActuator\u003c\/th\u003e\n\u003ctd\u003eToggle\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminal\u003c\/th\u003e\n\u003ctd\u003e#10-32 Screw Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eStandards Compliance\u003c\/th\u003e\n\u003ctd\u003eFor use when military specifications are under CFR 46\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eA-Series\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003ctd\u003eSingle\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 does the magnetic-hydraulic trip do that a thermal breaker doesn't?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It trips on actual current instead of heat. In a hot engine room past 40 degrees C, a thermal breaker can trip on ambient temperature alone. This one holds steady and only opens when the load truly exceeds 15 amps.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why is this a double-pole breaker?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Double-pole opens two legs at once. On a 120-volt AC circuit that lets you switch and protect both the hot and the neutral together, which is the standard way to build an AC main and is required on many CFR 46 inspected vessels.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does CFR 46 compliance mean here?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"CFR 46 covers the U.S. rules for commercial and inspected vessels. This breaker is built for use when military specifications are called out under CFR 46, so it's the right pick when your build spec or survey demands it.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size wire and terminals does it take?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The terminals are #10-32 screw studs. Land #10 AWG ring terminals on them and torque to about 12 to 15 inch-pounds. Don't overtighten, because the threads can strip.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use this on my 12 or 24-volt DC system?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The 65-volt DC rating covers 12 and 24-volt house systems with margin. For 48-volt banks or higher, confirm your arc-suppression needs first.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it work as a switch too?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The toggle actuator lets you turn the circuit on and off by hand, so it's a breaker and a manual switch in one panel position.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"The toggle feels stiff. Is something wrong?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No, that's normal on a new unit. Cycle it two or three times and it loosens up to easy one-handed operation.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the AC voltage rating good for?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's rated to 277 volts AC, which covers 120 and 240-volt shore-power and generator circuits with plenty of margin.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it fit my existing panel?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It uses the standard Blue Sea A-series panel cutout, but check that your panel has room for the double-pole width before ordering.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":45063169540189,"sku":"2008705","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_8b3d009c-595d-4841-b368-80b03a3de3bc.jpg?v=1789588209","url":"https:\/\/nvnmarine.com\/products\/blue-sea-7312-bss-15a-a-series-toggle-circuit-breaker","provider":"NVN Marine","version":"1.0","type":"link"}