{"product_id":"kw12-3-micro-roller-lever-limit-switch-pcb-microswitch-10-pack","title":"10-Pack KW12-3 Micro Roller Lever Limit Switch PCB Microswitch","description":"\n\u003ch2\u003e10-Pack KW12-3 Micro Roller Lever Arm Limit Switch — PCB Microswitch\u003c\/h2\u003e\n\u003cp\u003eGet reliable, fast-action switching performance with this 10-piece set of KW12-3 Micro Roller Lever Limit Switches. Designed for PCB (printed circuit board) mounting, these compact microswitches deliver precise, snap-action operation across a wide range of DIY electronics, automation, and appliance applications. Each switch features a roller lever arm for smooth, consistent actuation — ideal for makers, engineers, and hobbyists alike.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KW12-3 Micro Roller Lever Arm Limit Switch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Voltage:\u003c\/strong\u003e AC 125V–250V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCurrent Rating:\u003c\/strong\u003e 5A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -40°C to 70°C — suitable for demanding environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Size:\u003c\/strong\u003e 20 × 10 × 6 mm (L × W × H) — easy to integrate into tight spaces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePCB Terminals:\u003c\/strong\u003e Direct circuit board mounting for clean, secure installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoller Lever Arm:\u003c\/strong\u003e Provides smooth, consistent mechanical actuation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable plastic housing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Operating Force:\u003c\/strong\u003e Small stroke action with fast-break contact for high responsiveness\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e 10 switches included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eThese microswitches use a snap-action reed mechanism. An external mechanical force — applied via the roller lever — acts on the internal reed. When the force reaches a critical point, the reed snaps instantaneously, causing the moving contact to connect or disconnect from the fixed contact. When the force is released, the reed returns to its original position through reverse snap-action. This delivers \u003cstrong\u003efast, reliable, and repeatable\u003c\/strong\u003e open\/close switching with minimal travel distance and operating force.\u003c\/p\u003e\n\n\u003ch3\u003eWide Range of Applications\u003c\/h3\u003e\n\u003cp\u003eThese versatile microswitches are compatible with a broad array of applications, including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComputer mice and peripherals\u003c\/li\u003e\n  \u003cli\u003eAutomotive electronics and car accessories\u003c\/li\u003e\n  \u003cli\u003eCommunications equipment\u003c\/li\u003e\n  \u003cli\u003eTest and measurement instruments\u003c\/li\u003e\n  \u003cli\u003eGas water heaters and gas burners\u003c\/li\u003e\n  \u003cli\u003eSmall home appliances, microwave ovens, and electric rice cookers\u003c\/li\u003e\n  \u003cli\u003eFloating ball valve equipment\u003c\/li\u003e\n  \u003cli\u003eBuilding automation systems\u003c\/li\u003e\n  \u003cli\u003eElectric power tools\u003c\/li\u003e\n  \u003cli\u003e3D printers and CNC machines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10 × KW12-3 Micro Roller Lever Limit Switches\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eMade in China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltage and current are the KW12-3 micro roller lever limit switches rated for?\u003c\/h4\u003e\n\u003cp\u003eA: Each KW12-3 microswitch is rated for AC 125V–250V and a current of up to 5A, making them suitable for a wide variety of low-to-medium voltage electronics and appliance applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these microswitches compatible with PCB (printed circuit board) mounting?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the KW12-3 switches feature PCB terminal connections, allowing them to be mounted directly onto a circuit board for a clean and secure installation. Their compact 20 × 10 × 6 mm size makes them easy to integrate into most PCB layouts.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the operating temperature range for these limit switches?\u003c\/h4\u003e\n\u003cp\u003eA: These microswitches operate reliably in temperatures ranging from -40°C to 70°C, making them well-suited for both indoor electronics and more demanding environmental conditions.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can these switches be used in 3D printers or CNC machines as endstops?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The KW12-3 roller lever limit switch is a popular choice for 3D printer endstops and CNC homing switches due to its precise snap-action, compact size, and consistent actuation force.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What voltage and current are the KW12-3 micro roller lever limit switches rated for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Each KW12-3 microswitch is rated for AC 125V–250V and a current of up to 5A, making them suitable for a wide variety of low-to-medium voltage electronics and appliance applications.\"}}, {\"@type\": \"Question\", \"name\": \"Are these microswitches compatible with PCB (printed circuit board) mounting?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the KW12-3 switches feature PCB terminal connections, allowing them to be mounted directly onto a circuit board for a clean and secure installation. 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The KW12-3 roller lever limit switch is a popular choice for 3D printer endstops and CNC homing switches due to its precise snap-action, compact size, and consistent actuation force.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/0dwbi8-fa.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/0dwbi8-fa.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"10-Pack KW12-3 Micro Roller Lever Limit Switch PCB Microswitch\", \"item\": \"https:\/\/0dwbi8-fa.myshopify.com\/products\/kw12-3-micro-roller-lever-limit-switch-pcb-microswitch-10-pack\"}]}\u003c\/script\u003e","brand":"Quake","offers":[{"title":"Default Title","offer_id":50286584987875,"sku":"\u003cnone\u003e","price":9.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/9439\/1523\/files\/S9059ac76c6d545d090e385e6d91047aaR.webp?v=1790289898","url":"https:\/\/quakegoods.com\/products\/kw12-3-micro-roller-lever-limit-switch-pcb-microswitch-10-pack","provider":"Quake","version":"1.0","type":"link"}