{"product_id":"sierra-rs20050-contura-rotary-switch-off-on-on-off-1-1-2-11-rs20050","title":"Sierra RS20050 Contura Marine Rotary Switch – Off-On-(On), 3-Position (Off\/1\/1\u00262), IP67, Definitive Detent","description":"\u003ch2\u003eSierra RS20050 Contura Marine Rotary Switch – Off-On-(On), 3-Position (Off\/1\/1\u0026amp;2), IP67, Definitive Detent\u003c\/h2\u003e\u003cp\u003eThe Sierra RS20050 is a Contura marine rotary switch with a three-position Off-On-(On) configuration labeled Off \/ 1 \/ 1\u0026amp;2. This is a specialized battery management switch with a deliberate mix of maintained and momentary positions: Position Off disconnects all banks, Position 1 connects Battery Bank 1 only (maintained — stays in position when released), and Position 1\u0026amp;2 connects both banks simultaneously (momentary — springs back to Position 1 when released).\u003c\/p\u003e\u003cp\u003eThe momentary behavior on the 1\u0026amp;2 position is intentional — it prevents accidentally leaving both battery banks connected continuously, which could drain a reserve bank if the primary bank is depleted. This makes the RS20050 a more conservative battery management switch than the RS20040 (On-On-On, all positions maintained), suited to installations where protecting the reserve bank is a priority. The patented mechanism translates rotary motion into linear switching action, and a secondary cam provides definitive detent positions. Sealed to IP67 for above-panel components. Fits industry-standard panel openings.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Number: 11-RS20050\u003c\/li\u003e\n\u003cli\u003eSeries: Contura\u003c\/li\u003e\n\u003cli\u003eSwitch Type: Rotary (patented rotary-to-linear mechanism)\u003c\/li\u003e\n\u003cli\u003eConfiguration: Off-On-(On), 3-position — Off \/ Bank 1 (maintained) \/ Banks 1\u0026amp;2 (momentary)\u003c\/li\u003e\n\u003cli\u003ePosition Off: All banks disconnected\u003c\/li\u003e\n\u003cli\u003ePosition 1: Battery Bank 1 only — maintained\u003c\/li\u003e\n\u003cli\u003ePosition 1\u0026amp;2: Both banks simultaneously — momentary, springs back to Position 1 when released\u003c\/li\u003e\n\u003cli\u003eIllumination: None\u003c\/li\u003e\n\u003cli\u003eDetent: Secondary cam with definitive click positions\u003c\/li\u003e\n\u003cli\u003eSealing: IP67 (above-panel components)\u003c\/li\u003e\n\u003cli\u003ePanel Opening: Industry-standard fit\u003c\/li\u003e\n\u003cli\u003eNote: (On) in parentheses designates a momentary position\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMarine battery management where Bank 1 is the primary bank and both banks should only be connected momentarily for charging or emergency use\u003c\/li\u003e\n\u003cli\u003eInstallations where protecting a reserve battery bank from continuous parallel drain is a priority\u003c\/li\u003e\n\u003cli\u003eMarine helm panels requiring IP67-rated three-position battery management rotary switches\u003c\/li\u003e\n\u003cli\u003eNew helm panel builds and retrofits using industry-standard panel openings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe RS20050 is the right choice when you want a battery selector that actively prevents leaving both banks connected — the momentary 1\u0026amp;2 position means you have to hold the switch to keep both banks parallel, which is the correct behavior for emergency parallel starts or equalization charging where you don’t want the connection to persist unattended. This is a more conservative battery management approach than the \u003ca href=\"\/products\/sierra-rs20040-contura-marine-rotary-switch-on-on-on-3-position-1-2-3-ip67-definitive-detent\"\u003eSierra RS20040 On-On-On 1-2-3 Battery Selector\u003c\/a\u003e, which keeps all positions maintained. For a two-position On-On rotary switch with a dual red\/green LED indicator, the \u003ca href=\"\/products\/sierra-rs20000-contura-marine-rotary-switch-on-on-red-green-led-ip67-definitive-detent\"\u003eSierra RS20000 Contura On-On Rotary Switch\u003c\/a\u003e is the simpler two-position alternative. For a three-position On-Off-On rotary switch with a center-off and red LED, the \u003ca href=\"\/products\/sierra-rs20020-contura-marine-rotary-switch-on-off-on-red-led-ip67-definitive-detent\"\u003eSierra RS20020 Contura On-Off-On Rotary Switch\u003c\/a\u003e covers that application.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250883723300,"sku":"11-RS20050","price":37.39,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/11-RS20050.jpg?v=1786511630","url":"https:\/\/marisolmarine.com\/products\/sierra-rs20050-contura-rotary-switch-off-on-on-off-1-1-2-11-rs20050","provider":"Marisol Marine Company","version":"1.0","type":"link"}