{"product_id":"blue-sea-heavy-duty-selector-battery-switch-500a","title":"Blue Sea 500A HD-Series Heavy Duty 4 Position (OFF\/1\/2\/1+2) Battery Selector Switch","description":"\u003ch2\u003eHigh-Capacity Dual Battery Management for Marine and Vehicle Systems\u003c\/h2\u003e \u003cp\u003eThe \u003cstrong\u003eBlue Sea HD-Series Battery Selector Switch\u003c\/strong\u003e is engineered to manage high-amperage power distribution in marine, RV, and heavy-duty vehicle applications. As part of the 500A HD-Series, this switch provides a robust solution for switching between two isolated battery banks or combining them for emergency starting power. Its rugged construction ensures reliability in demanding environments, making it an industry-standard choice for upgrading 12V and 24V electrical systems.\u003c\/p\u003e  \u003ch3\u003eVersatile 4-Position Switching\u003c\/h3\u003e \u003cp\u003eDesigned for flexibility, the 4-position dial allows you to select between \u003cstrong\u003eBattery 1\u003c\/strong\u003e, \u003cstrong\u003eBattery 2\u003c\/strong\u003e, or \u003cstrong\u003eBoth (1+2)\u003c\/strong\u003e, as well as a complete \u003cstrong\u003eOFF\u003c\/strong\u003e position. This functionality is essential for dual-battery setups, allowing you to reserve one bank for engine starting while powering accessories from the second bank. In the event of a flat starting battery, the \"Combine\" function allows you to parallel both banks for a powerful emergency jump-start.\u003c\/p\u003e  \u003cp\u003eCrucially, the switch features a \u003cstrong\u003emake-before-break contact design\u003c\/strong\u003e. This ensures that power flow remains uninterrupted when switching between battery banks, preventing nuisance resets of sensitive electronics like GPS units, radios, and engine control modules.\u003c\/p\u003e  \u003ch3\u003eHeavy-Duty Performance for High-Load Engines\u003c\/h3\u003e \u003cp\u003eBuilt to handle the demands of large diesel engines and high-draw electrical loads, this switch offers impressive power handling capabilities. While designated as part of the 500A series, it is rated for a solid \u003cstrong\u003e400A continuous current\u003c\/strong\u003e and an exceptional \u003cstrong\u003e1600A cranking rating (30 seconds)\u003c\/strong\u003e. This high cranking capacity makes it suitable for starting large marine inboards and commercial vehicle engines without voltage drop issues.\u003c\/p\u003e  \u003ch3\u003eSafety and Durability in Harsh Conditions\u003c\/h3\u003e \u003cp\u003eSafety is paramount in marine installations. This unit is \u003cstrong\u003eignition protected\u003c\/strong\u003e, making it safe for installation on gasoline-powered boats by preventing sparks that could ignite fumes. The case is constructed to withstand vibration and environmental stress, featuring \u003cstrong\u003etinned copper studs\u003c\/strong\u003e for maximum conductivity and corrosion resistance.\u003c\/p\u003e  \u003cp\u003eFor installation flexibility, the switch supports both surface and rear panel mounting. The heavy-duty \u003cstrong\u003e1\/2\" (approx. M12) terminal studs\u003c\/strong\u003e are designed to accept large cable lugs, accommodating up to \u003cstrong\u003e4\/0 AWG (approx. 120mm²) battery cables\u003c\/strong\u003e to minimise resistance and heat build-up.\u003c\/p\u003e  \u003ch3\u003eKey Features\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e \u003cstrong\u003eHigh Cranking Rating:\u003c\/strong\u003e Handles up to 1600A for 30 seconds, ideal for starting heavy engines.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003e4-Position Selector:\u003c\/strong\u003e Offers OFF, 1, 2, and 1+2 (Combine) settings for complete battery management.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eMake-Before-Break:\u003c\/strong\u003e Allows switching between banks without cutting power to connected devices.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eIgnition Protected:\u003c\/strong\u003e Safe for use in engine rooms and fuel storage areas.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eFlexible Mounting:\u003c\/strong\u003e Compatible with surface or rear panel installation using 1\/4\" (approx. M6) fasteners.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eCorrosion Resistant:\u003c\/strong\u003e Features 1\/2\" (approx. M12) tinned copper studs for long-lasting marine performance.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003eUpgrade Your Power System\u003c\/h3\u003e \u003cp\u003eEnsure your vessel or vehicle has the reliable power switching it needs. Install the \u003cstrong\u003eBlue Sea HD-Series Selector Switch\u003c\/strong\u003e today for safe, efficient, and professional battery management.\u003c\/p\u003e","brand":"Blue Sea","offers":[{"title":"Default Title","offer_id":55056831152467,"sku":"BS-3002B","price":74.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1076\/9324\/4755\/files\/blue-sea-hd-series-4-position-switch-BS-3002B.jpg?v=1790336371","url":"https:\/\/progradewarehouse.com\/products\/blue-sea-heavy-duty-selector-battery-switch-500a","provider":"PRO GRADE WAREHOUSE","version":"1.0","type":"link"}