{"product_id":"blue-sea-battery-switch-350a-3-position-w-afd","title":"Blue Sea 350A Red e-Series 3 Position (OFF\/1\/2) Battery Selector Switch w\/ AFD","description":"\u003ch2\u003eEssential Battery Selection with Alternator Protection\u003c\/h2\u003e \u003cp\u003eManaging multiple battery banks on a boat or heavy-duty vehicle requires robust switching gear. The \u003cstrong\u003eBlue Sea e-Series 3 Position Battery Selector Switch\u003c\/strong\u003e provides a reliable method to switch a single load group between two isolated battery sources. Whether you need to reserve a dedicated starting battery or cycle between two house banks, this switch offers clear, tactile control without the risk of accidental parallel connection.\u003c\/p\u003e \u003cp\u003eUnlike standard selectors, this model includes \u003cstrong\u003eAlternator Field Disconnect (AFD)\u003c\/strong\u003e capabilities. This critical feature protects your vessel's charging system during operation, safeguarding against costly alternator diode failure if the switch is accidentally turned to the 'OFF' position while the engine is running.\u003c\/p\u003e \u003ch3\u003eProtect Your Alternator with AFD Technology\u003c\/h3\u003e \u003cp\u003eOne of the most common risks in manual battery switching is the accidental disconnection of the battery while the alternator is charging. This creates a voltage spike—often called a load dump—that can instantly destroy the rectifier diodes in your alternator.\u003c\/p\u003e \u003cp\u003eThe integrated \u003cstrong\u003eAFD feature\u003c\/strong\u003e solves this problem. It disconnects the alternator field wire slightly before the main battery circuit opens, ensuring the alternator stops generating power before the load is removed. This simple yet effective mechanism provides peace of mind for boat owners and prevents expensive repairs to charging components.\u003c\/p\u003e \u003ch3\u003eBuilt for Harsh Marine Environments\u003c\/h3\u003e \u003cp\u003eDesigned for the demanding conditions of the Australian marine environment, the e-Series switch features \u003cstrong\u003etinned copper studs\u003c\/strong\u003e for maximum conductivity and corrosion resistance. The casing is \u003cstrong\u003eignition protected\u003c\/strong\u003e, making it safe for installation on gasoline-powered boats where fuel vapours may be present.\u003c\/p\u003e \u003cp\u003eWith a \u003cstrong\u003emaximum voltage of 32V DC\u003c\/strong\u003e, this switch is perfectly suited for 12V and 24V systems found in yachts, 4WDs, and caravans. The robust design handles significant power demands:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cstrong\u003eContinuous Rating:\u003c\/strong\u003e 325A\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eIntermittent Rating:\u003c\/strong\u003e 600A (5 minutes)\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eCranking Rating:\u003c\/strong\u003e 1200A (30 seconds)\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eInstallation Flexibility and Compatibility\u003c\/h3\u003e \u003cp\u003eRetrofitting or installing a new system is straightforward thanks to the versatile case design, which allows for either surface or rear panel mounting. The switch fits standard industry mounting patterns, making it an easy upgrade for older equipment.\u003c\/p\u003e \u003cp\u003eFor heavy-duty cabling, the switch accommodates large lugs with \u003cstrong\u003e3\/8\"-16 (Approx. M10) terminal studs\u003c\/strong\u003e. The housing provides ample clearance for cables up to \u003cstrong\u003e4\/0 AWG (Approx. 120mm²)\u003c\/strong\u003e, ensuring you can maintain low voltage drop across your system.\u003c\/p\u003e \u003ch3\u003eKey Features\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e \u003cstrong\u003e3-Position Operation (OFF\/1\/2):\u003c\/strong\u003e Selects between two battery sources for a single load without combining them.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eAlternator Field Disconnect (AFD):\u003c\/strong\u003e Protects alternator diodes if the switch is turned off while the engine is running.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eHigh Current Handling:\u003c\/strong\u003e Supports 325A continuous and 1200A cranking loads.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eIgnition Protected:\u003c\/strong\u003e Safe for use in engine rooms and fuel lockers.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eVersatile Mounting:\u003c\/strong\u003e Surface or rear panel mount with \u003cstrong\u003e1\/4\" (Approx. M6)\u003c\/strong\u003e mounting holes.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eCorrosion Resistant:\u003c\/strong\u003e Tinned copper studs and reinforced polycarbonate housing.\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eReliable Power Control for Your Setup\u003c\/h3\u003e \u003cp\u003eWhether you are outfitting a cruising yacht or upgrading a touring 4WD, proper battery isolation is key to system reliability. The Blue Sea e-Series switch ensures you have power when you need it, protecting both your batteries and your charging infrastructure.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eEquip your vessel with professional-grade power management. Secure your Blue Sea e-Series Battery Selector Switch today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Blue Sea","offers":[{"title":"Default Title","offer_id":55056834527571,"sku":"BS-11001B","price":54.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1076\/9324\/4755\/files\/blue-sea-3-position-selector-switch-BS-11001B.jpg?v=1790336396","url":"https:\/\/progradewarehouse.com\/products\/blue-sea-battery-switch-350a-3-position-w-afd","provider":"PRO GRADE WAREHOUSE","version":"1.0","type":"link"}