{"product_id":"sierra-bs11020-dual-battery-selector-switch-1-2-both-off-48v-ip66-ignition-protected","title":"Sierra BS11020 Dual Battery Selector Switch – 1\/2\/Both\/Off, 48V, IP66, Ignition Protected","description":"\u003ch2\u003eSierra BS11020 Dual Battery Selector Switch – 1\/2\/Both\/Off\u003c\/h2\u003e\u003cp\u003eA 4-position dual battery selector switch for marine electrical systems with two battery banks. The four positions — Battery 1, Battery 2, Both, and Off — let you select which battery bank powers the boat, combine both banks for starting or heavy loads, or disconnect completely. This is the standard configuration for most twin-battery marine setups, where one bank is dedicated to starting and the other to house loads.\u003c\/p\u003e\u003cp\u003eBuilt on the same premium platform as the BS11000 series: IP66 rated, CE certified, ISO8846\/SAE J1171 ignition protection compliant, glass fiber reinforced nylon enclosure, removable ergonomic knob, and flexible surface or panel mounting. M8 studs accommodate the dual-battery wiring configuration.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e4-position selector: Battery 1 – Battery 2 – Both – Off\u003c\/li\u003e\n\u003cli\u003e2 battery inputs for dual-bank systems\u003c\/li\u003e\n\u003cli\u003eMaximum voltage: 48V DC\u003c\/li\u003e\n\u003cli\u003eCable size: 4\/0 AWG to meet ratings\u003c\/li\u003e\n\u003cli\u003eTin-plated copper battery studs (M8) — stud torque: 120 lb-in\u003c\/li\u003e\n\u003cli\u003eRemovable ergonomic knob for safety isolation\u003c\/li\u003e\n\u003cli\u003eInterchangeable knob labels for easy circuit identification\u003c\/li\u003e\n\u003cli\u003eGlass fiber reinforced nylon enclosure — corrosion-resistant\u003c\/li\u003e\n\u003cli\u003eRemovable windows on all four sides for flexible wiring access\u003c\/li\u003e\n\u003cli\u003eSurface or panel mount options\u003c\/li\u003e\n\u003cli\u003eIncludes 4× M4×35 mounting screws\u003c\/li\u003e\n\u003cli\u003eIP66 rated — dust-tight and protected against powerful water jets\u003c\/li\u003e\n\u003cli\u003eCE certified\u003c\/li\u003e\n\u003cli\u003eMeets Ignition Protection Standard ISO8846 \/ SAE J1171\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDual-battery marine electrical systems with dedicated start and house banks\u003c\/li\u003e\n\u003cli\u003e12V, 24V, and 48V twin-battery configurations\u003c\/li\u003e\n\u003cli\u003eGasoline-engine compartments requiring ignition-protected switching\u003c\/li\u003e\n\u003cli\u003eNew builds and refit projects requiring a certified dual-battery selector switch\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eRelated Products\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-bs11000-battery-disconnect-switch-on-off-48v-ip66-ignition-protected\"\u003eSierra BS11000 Battery Disconnect Switch – On\/Off, Single Battery\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-bs11010-battery-disconnect-switch-on-off-alternator-field-disconnect-48v-ip66\"\u003eSierra BS11010 Battery Disconnect Switch – On\/Off with AFD\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/blue-sea-systems-battery-switch-2pos-350a-bss-9003e\"\u003eBlue Sea Systems Battery Switch – 2-Position, 350A (BSS-9003E)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/blue-sea-systems-4-position-300a-battery-switch-bss-6007\"\u003eBlue Sea Systems 4-Position 300A Battery Switch (BSS-6007)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/bep-700-easyfit-battery-master-switch\"\u003eBEP 700 Easyfit Battery Master Switch\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/seachoice-battery-select-switch-disconnect-isolator-cutoff-12-50v\"\u003eSeachoice Battery Select Switch – Disconnect Isolator Cutoff, 12–50V\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e The BS11020 is the right switch for the standard twin-battery marine setup — one starting battery and one house battery — where you want to select between banks, combine them for engine starting, or disconnect completely. The Both position is particularly useful for emergency starting when the primary bank is low. The IP66 rating and ignition protection certification make it suitable for exposed helm locations and gasoline-engine compartments. If you only have a single battery bank and need a simple On\/Off disconnect, the \u003ca href=\"\/products\/sierra-bs11000-battery-disconnect-switch-on-off-48v-ip66-ignition-protected\"\u003eBS11000\u003c\/a\u003e is the correct fit. For a single-battery switch with alternator protection, see the \u003ca href=\"\/products\/sierra-bs11010-battery-disconnect-switch-on-off-alternator-field-disconnect-48v-ip66\"\u003eBS11010 with AFD\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250881134628,"sku":"11-BS11020","price":67.79,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/11-BS11020.jpg?v=1786511552","url":"https:\/\/marisolmarine.com\/products\/sierra-bs11020-dual-battery-selector-switch-1-2-both-off-48v-ip66-ignition-protected","provider":"Marisol Marine Company","version":"1.0","type":"link"}