{"product_id":"sierra-rk40620b-blue-led-rocker-switch-12v-20a-spst","title":"Sierra RK40620B Blue LED Rocker Switch | 12V 20A SPST","description":"\u003cp class=\"nvn-hero\"\u003eThe Sierra RK40620B is a 12 volt, 20 amp single pole single throw rocker switch with a blue illuminated halo in a black rectangular body. Clean on-off control for accessory circuits, and the blue ring lets you find it fast on a night run.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Sierra RK40620B is one of those parts you don't think about until you need it, and then you're glad it's built right. It's a 12 volt, 20 amp single pole single throw rocker switch with a blue illuminated halo, wrapped in a black rectangular housing that drops into a standard rocker panel. On-off, plain and simple. Flip it up, the circuit's live and the blue ring glows so you can find it in the dark. Flip it down, everything's off.\u003c\/p\u003e\n\u003cp\u003eWe reach for switches like this all the time when we're rigging up accessory circuits. Deck lights, a livewell pump, a set of spreader lights, an accessory 12 volt outlet, a stereo amp remote. Anything you want a clean, positive on-off for. The blue halo isn't just for looks either. On a night run, being able to glance down and see which circuits are hot without hunting for a label is worth a lot.\u003c\/p\u003e\n\u003cp\u003eThis is a single pole single throw switch, which is the marine way of saying it does one job. It opens or closes one circuit. There's no on-off-on, no momentary spring-back, no second position. So if you're wiring something that needs to reverse or needs a center-off, this isn't the switch for that. For a straight accessory you turn on and leave on, it's exactly right. Sierra also makes an SPDT version in the same body if your project needs the extra throw.\u003c\/p\u003e\n\u003cp\u003eWiring is straightforward. You've got three blade terminals on the back. One feeds power in from your fuse block, one sends power out to the accessory, and the third grounds the LED so the halo lights up. Run it off a properly fused circuit, size your wire to the load, and you're set. For most accessory runs on a small boat, 14 gauge tinned wire pairs nicely with the 20 amp rating. We always tell folks to hit the spade terminals with a little dielectric grease before you snap them on. Terminals live a hard life in a damp console or locker, and that dab of grease keeps corrosion off the copper.\u003c\/p\u003e\n\u003cp\u003eAbout that 20 amp rating. It's an honest number for a resistive load like lights. But motors and pumps pull a big inrush spike when they start, so if you're switching something inductive like a bilge pump or a washdown pump, give yourself margin and keep the continuous draw well under the rating. Better to run a switch cool than to cook the contacts over a couple of seasons.\u003c\/p\u003e\n\u003cp\u003eOne quirk worth knowing with illuminated rocker switches in general. Some owners notice the LED still glows very faintly when the switch is off. That's a tiny bit of leakage current through the lamp circuit, it's harmless, and it doesn't mean the switch is bad. On a big battery bank you'll never notice it. On a small bank where you're counting every amp-hour overnight, just know the halo sips a few milliamps whenever the circuit's energized.\u003c\/p\u003e\n\u003cp\u003eIt's a snap-in rocker, so it seats into a rectangular cutout and holds with the housing tabs. On a hard-running planing hull, vibration can eventually work snap-in switches loose, so a lot of us put a small dab of adhesive at the corners once we know the placement is right. One more honest note. The data we have doesn't list a waterproof rating on this one, so treat it as a behind-the-dash or protected-panel switch. If it's going somewhere it'll catch spray, add a rubber rocker boot over the face and you're covered.\u003c\/p\u003e\n\u003cp\u003eFor the money, it's a solid, no-drama switch from a brand that's been supplying marine and OEM electrical parts for decades. It won't be the flashiest thing on your dash. It'll just work, night after night, which is exactly what you want out of a switch.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e12 volt DC, 20 amp SPST rocker: one circuit on or off with a clean, positive click\u003c\/li\u003e\n  \u003cli\u003eBlue illuminated halo ring, easy to spot and confirm at the helm on a night run\u003c\/li\u003e\n  \u003cli\u003eRectangular snap-in body drops into a standard rocker panel cutout\u003c\/li\u003e\n  \u003cli\u003eThree blade terminals: power in, power out, and LED ground for simple accessory wiring\u003c\/li\u003e\n  \u003cli\u003eBlack housing and bezel that blend into most dash and console panels\u003c\/li\u003e\n  \u003cli\u003eSingle pole single throw, ideal for lights, outlets, and accessory circuits you leave on\u003c\/li\u003e\n  \u003cli\u003eBuilt by Sierra Marine, a longtime supplier of marine and OEM electrical parts\u003c\/li\u003e\n  \u003cli\u003ePairs well with 14 gauge tinned wire for typical accessory loads under the 20 amp rating\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sierra Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does SPST mean on this switch?\u003c\/summary\u003e\n    \u003cp\u003eSingle pole single throw. It controls one circuit and gives you two positions, on and off. There's no center-off and no second on position. For a straight accessory you turn on and leave on, that's exactly what you want.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a momentary (spring-return) switch?\u003c\/summary\u003e\n    \u003cp\u003eNo. It's a standard maintained on-off rocker. Flip it up and it stays on, flip it down and it stays off. If you need a momentary switch that springs back when you let go, this isn't the one.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy does it have three terminals?\u003c\/summary\u003e\n    \u003cp\u003eBecause the halo is illuminated. One terminal takes power in from your fuse block, one sends power out to the accessory, and the third is a ground for the LED so the blue ring lights up. Wire all three and the illumination works as intended.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy does the blue LED glow faintly when the switch is off?\u003c\/summary\u003e\n    \u003cp\u003eThat's a small amount of leakage current through the lamp circuit on illuminated rockers. It's harmless and doesn't mean the switch is faulty. On a large battery bank you won't notice it. On a small bank you're watching overnight, just know the halo draws a few milliamps whenever the circuit is energized.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use this to switch a bilge or washdown pump?\u003c\/summary\u003e\n    \u003cp\u003eYou can, but respect the 20 amp rating. Pumps and other motors pull a big inrush spike at startup, so keep the continuous draw well under 20 amps and give yourself margin. Running the switch cool means it lasts a lot longer than one worked right at its limit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs the switch waterproof?\u003c\/summary\u003e\n    \u003cp\u003eThe data we have doesn't list a waterproof rating, so treat it as a protected-panel or behind-the-dash switch. If it's mounting somewhere that catches spray, add a rubber rocker boot over the face to keep water off the contacts.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size wire should I use?\u003c\/summary\u003e\n    \u003cp\u003eFor most accessory circuits on a small boat, 14 gauge tinned marine wire pairs nicely with the 20 amp rating. Always run it off a properly fused circuit and size the wire to the actual load and run length.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes Sierra make an on-off-on version?\u003c\/summary\u003e\n    \u003cp\u003eYes. Sierra offers an SPDT (single pole double throw) rocker in the same body if your project needs a second throw or an on-off-on action instead of a simple on-off.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eOn-Off; 12 Volt DC; 20 Amp; Rocker Switch; Rectangular; Blue Illuminated; Black; Single Pole Single Throw (SPST)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eRK40620B\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e808282380984\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOperation\u003c\/th\u003e\n\u003ctd\u003eOn-Off\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e12 Volt DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAmperage Rating\u003c\/th\u003e\n\u003ctd\u003e20 Amp\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSwitch Type\u003c\/th\u003e\n\u003ctd\u003eRocker Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eShape\u003c\/th\u003e\n\u003ctd\u003eRectangular\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIllumination\u003c\/th\u003e\n\u003ctd\u003eBlue Illuminated Halo (LED)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHousing Color\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCircuit Configuration\u003c\/th\u003e\n\u003ctd\u003eSingle Pole Single Throw (SPST)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNumber of Positions\u003c\/th\u003e\n\u003ctd\u003e2 (On-Off)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does SPST mean on this switch?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Single pole single throw. It controls one circuit and gives you two positions, on and off. There's no center-off and no second on position. For a straight accessory you turn on and leave on, that's exactly what you want.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a momentary (spring-return) switch?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. It's a standard maintained on-off rocker. Flip it up and it stays on, flip it down and it stays off. If you need a momentary switch that springs back when you let go, this isn't the one.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why does it have three terminals?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Because the halo is illuminated. One terminal takes power in from your fuse block, one sends power out to the accessory, and the third is a ground for the LED so the blue ring lights up. Wire all three and the illumination works as intended.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why does the blue LED glow faintly when the switch is off?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"That's a small amount of leakage current through the lamp circuit on illuminated rockers. It's harmless and doesn't mean the switch is faulty. On a large battery bank you won't notice it. On a small bank you're watching overnight, just know the halo draws a few milliamps whenever the circuit is energized.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use this to switch a bilge or washdown pump?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"You can, but respect the 20 amp rating. Pumps and other motors pull a big inrush spike at startup, so keep the continuous draw well under 20 amps and give yourself margin. Running the switch cool means it lasts a lot longer than one worked right at its limit.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is the switch waterproof?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The data we have doesn't list a waterproof rating, so treat it as a protected-panel or behind-the-dash switch. If it's mounting somewhere that catches spray, add a rubber rocker boot over the face to keep water off the contacts.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size wire should I use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"For most accessory circuits on a small boat, 14 gauge tinned marine wire pairs nicely with the 20 amp rating. Always run it off a properly fused circuit and size the wire to the actual load and run length.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does Sierra make an on-off-on version?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Sierra offers an SPDT (single pole double throw) rocker in the same body if your project needs a second throw or an on-off-on action instead of a simple on-off.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Sierra Marine","offers":[{"title":"Default Title","offer_id":45075464454237,"sku":"2009607","price":31.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_28cae78a-0af3-480b-8d29-a10bb1d37178.jpg?v=1789840866","url":"https:\/\/nvnmarine.com\/products\/sierra-rk40620b-blue-led-rocker-switch-12v-20a-spst","provider":"NVN Marine","version":"1.0","type":"link"}