{"product_id":"blue-sea-battery-switch-300a-4-position-red","title":"Blue Sea 300A Red Mini m-Series 4 Position (OFF\/1\/2\/1+2) Battery Selector Switch","description":"\u003ch2\u003eCompact Dual Battery Management for Marine and RV Systems\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBlue Sea m-Series Battery Selector Switch\u003c\/strong\u003e is the industry standard for managing dual battery banks in boats, caravans, and 4WDs. Designed to provide safe and reliable switching between a starting battery and a house bank, this compact unit solves the common problem of accidental starting battery depletion. By isolating your electrical loads, you ensure that your engine always has the power it needs to crank, while your accessories run independently.\u003c\/p\u003e\n\u003cp\u003eEngineered for the harsh marine environment, this switch features a robust construction suitable for systems up to \u003cstrong\u003e32V DC\u003c\/strong\u003e. Whether you are upgrading a tinny, fitting out a camper trailer, or replacing an old isolator in an engine room, the m-Series delivers professional-grade performance in a footprint that fits almost anywhere.\u003c\/p\u003e\n\n\u003ch3\u003eVersatile 4-Position Switching\u003c\/h3\u003e\n\u003cp\u003eThis selector switch offers four distinct positions to give you complete control over your power management:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOFF:\u003c\/strong\u003e Completely disconnects all batteries from the loads for storage or maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1:\u003c\/strong\u003e Connects Battery Bank 1 (typically the starting battery) to the loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2:\u003c\/strong\u003e Connects Battery Bank 2 (typically the house battery) to the loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1+2 (Combine):\u003c\/strong\u003e Parallels both battery banks for emergency starting if one battery is low.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCrucially, the unit utilises a \u003cstrong\u003emake-before-break contact design\u003c\/strong\u003e. This allows you to switch between battery banks (e.g., from 1 to 2) while the engine is running or electronics are active without interrupting power. This prevents sensitive navigation equipment, radios, or engine management systems from resetting during operation.\u003c\/p\u003e\n\n\u003ch3\u003eBuilt for Safety and Durability\u003c\/h3\u003e\n\u003cp\u003eSafety is paramount in electrical installations, particularly where fuel fumes may be present. The Blue Sea m-Series is \u003cstrong\u003eignition protected\u003c\/strong\u003e, making it safe for installation in the engine rooms of gasoline-powered boats. The case design allows for versatile mounting options—surface, front panel, or rear panel—ensuring a clean finish in any setup.\u003c\/p\u003e\n\u003cp\u003eThe switch is built with \u003cstrong\u003etinned copper studs\u003c\/strong\u003e for maximum conductivity and corrosion resistance. The \u003cstrong\u003e3\/8\"-16 (Approx. M10)\u003c\/strong\u003e terminal studs are designed to accept heavy-duty ring terminals and handle the torque required for a secure vibration-resistant connection. With a \u003cstrong\u003e300A continuous rating\u003c\/strong\u003e, it easily handles the demands of most alternators and onboard appliances found in recreational vehicles and vessels.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300A Continuous Rating:\u003c\/strong\u003e Handles high-current demands with a 500A intermittent rating (5 min) and 900A cranking (30 sec).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Protected:\u003c\/strong\u003e Safe for installation aboard gasoline-powered boats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMake-Before-Break:\u003c\/strong\u003e Switch battery banks without power loss to electronics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Terminals:\u003c\/strong\u003e 3\/8\"-16 (Approx. M10) studs accept substantial cabling, accommodating up to 4\/0 AWG (approx. 120mm²) lugs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Mounting:\u003c\/strong\u003e Fits standard industry cutouts for easy retrofitting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose the m-Series?\u003c\/h3\u003e\n\u003cp\u003eGeneric switches often fail under the stress of saltwater environments or high-vibration off-road use. The Blue Sea m-Series is tested to ensure longevity and reliability. Its tactile knob provides positive feedback, so you know exactly which position is engaged, even in low-light conditions. For anyone building a dual-battery system, this switch offers the peace of mind that your power distribution is secure, efficient, and ready for adventure.\u003c\/p\u003e\n\n\u003ch3\u003eSecure Your Power System Today\u003c\/h3\u003e\n\u003cp\u003eUpgrade your battery management with the reliability of Blue Sea Systems. Whether for a weekend fishing trip or a lap around Australia, ensure your batteries are isolated and ready when you need them.\u003c\/p\u003e","brand":"Blue Sea","offers":[{"title":"Default Title","offer_id":42037160017981,"sku":"BS-6007B","price":80.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0602\/3918\/3933\/files\/blue-sea-m-series-battery-selector-switch-BS-6007B.png?v=1769645332","url":"https:\/\/www.solar4rvs.com.au\/products\/blue-sea-battery-switch-300a-4-position-red","provider":"Solar 4 RVs","version":"1.0","type":"link"}