{"product_id":"kw12-3-roller-lever-micro-limit-switch-pcb-terminals-10pcs","title":"10pcs KW12-3 Roller Lever Micro Limit Switch PCB NO\/NC 5A","description":"\n\u003ch2\u003eKW12-3 Roller Lever Arm Micro Limit Switches – 10-Pack with PCB Terminals\u003c\/h2\u003e\n\u003cp\u003eKeep your electronics and automation projects running reliably with this 10-piece set of \u003cstrong\u003eKW12-3 Roller Lever Micro Limit Switches\u003c\/strong\u003e. Featuring both Normally Open (NO) and Normally Closed (NC) terminals and a compact PCB-mount design, these switches deliver fast, precise actuation for a wide variety of DIY, hobby, and industrial applications. Whether you're building a 3D printer, automating a conveyor, or repairing a household appliance, these micro switches offer the dependable snap-action performance you need.\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 Limit Switch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSwitch Type:\u003c\/strong\u003e Roller Lever Arm with snap-action mechanism\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTerminals:\u003c\/strong\u003e PCB (Circuit Board) mount – Normally Open (NO) \u0026amp; Normally Closed (NC)\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 20 × 10 × 6 mm (L × W × H)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable plastic housing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 10 switches per pack\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eThe KW12-3 uses a snap-action reed mechanism driven by the roller lever arm. When an external mechanical force (from a cam, lever, or moving part) deflects the roller to the critical actuation point, the internal spring reed snaps instantly — making or breaking the circuit in a fraction of a second. When the force is removed, the reed returns to its original position with an equally fast reverse action. This fast-break \/ fast-make design ensures clean, reliable switching with minimal contact bounce.\u003c\/p\u003e\n\n\u003ch3\u003eWide Range of Applications\u003c\/h3\u003e\n\u003cp\u003eThese versatile micro limit switches are used across countless applications, including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e3D printers \u0026amp; CNC machines (homing \u0026amp; end-stop sensing)\u003c\/li\u003e\n  \u003cli\u003eComputer mice \u0026amp; peripherals\u003c\/li\u003e\n  \u003cli\u003eAutomotive \u0026amp; communications electronics\u003c\/li\u003e\n  \u003cli\u003eGas water heaters \u0026amp; gas burners\u003c\/li\u003e\n  \u003cli\u003eMicrowave ovens \u0026amp; electric rice cookers\u003c\/li\u003e\n  \u003cli\u003eSmall home appliances \u0026amp; building automation\u003c\/li\u003e\n  \u003cli\u003eElectric power tools \u0026amp; test instruments\u003c\/li\u003e\n  \u003cli\u003eFloating ball equipment \u0026amp; fluid-level control\u003c\/li\u003e\n  \u003cli\u003eMedical equipment \u0026amp; military-grade instruments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10 × KW12-3 Roller Lever Micro Limit Switches\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-poster-inspirational-quote\"\u003e\"1% Better Every Day\" Motivational Canvas Poster | Wall Art\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/everything-is-figureoutable-sage-green-quote-canvas-wall-art\"\u003e\"Everything Is Figureoutable\" Sage Green Quote Canvas Wall Art\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical Safety Reference\u003c\/h3\u003e\n\u003cp\u003eFor guidance on safe handling and use of electrical components, visit the U.S. Consumer Product Safety Commission – Electrical Safety.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Limit_switch\" target=\"_blank\" rel=\"noopener\"\u003eLimit switch\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between the Normally Open (NO) and Normally Closed (NC) terminals on the KW12-3?\u003c\/h4\u003e\n\u003cp\u003eA: In a micro limit switch, the \u003cstrong\u003eNormally Open (NO)\u003c\/strong\u003e terminal completes the circuit only when the lever arm is actuated (pressed), while the \u003cstrong\u003eNormally Closed (NC)\u003c\/strong\u003e terminal maintains a continuous circuit that is broken when the lever is actuated. This gives you flexibility to design circuits that trigger ON or OFF depending on your application's logic.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these KW12-3 switches compatible with 3D printer end stops?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The KW12-3 roller lever micro limit switch is one of the most popular choices for 3D printer homing and end-stop switches. The compact 20 × 10 × 6 mm PCB-mount form factor fits standard end-stop mounts, and the snap-action mechanism provides precise, repeatable positioning — making this 10-pack a great value for builders and repair techs.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What voltage and current can these micro limit switches handle?\u003c\/h4\u003e\n\u003cp\u003eA: Each KW12-3 switch is rated for \u003cstrong\u003eAC 125V–250V\u003c\/strong\u003e and a maximum current of \u003cstrong\u003e5A\u003c\/strong\u003e. They are suitable for typical low-to-medium power switching tasks in household appliances, automation systems, and electronic equipment within these ratings.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can these switches be used in outdoor or high-temperature environments?\u003c\/h4\u003e\n\u003cp\u003eA: These switches are designed for an operating temperature range of \u003cstrong\u003e-40°C to 70°C\u003c\/strong\u003e, making them suitable for a broad range of environments. However, they are not sealed or weatherproof, so for outdoor or high-humidity applications additional housing or protection is recommended.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between the Normally Open (NO) and Normally Closed (NC) terminals on the KW12-3?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"In a micro limit switch, the Normally Open (NO) terminal completes the circuit only when the lever arm is actuated (pressed), while the Normally Closed (NC) terminal maintains a continuous circuit that is broken when the lever is actuated. This gives you flexibility to design circuits that trigger ON or OFF depending on your application's logic.\"}}, {\"@type\": \"Question\", \"name\": \"Are these KW12-3 switches compatible with 3D printer end stops?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The KW12-3 roller lever micro limit switch is one of the most popular choices for 3D printer homing and end-stop switches. The compact 20 × 10 × 6 mm PCB-mount form factor fits standard end-stop mounts, and the snap-action mechanism provides precise, repeatable positioning — making this 10-pack a great value for builders and repair techs.\"}}, {\"@type\": \"Question\", \"name\": \"What voltage and current can these micro limit switches handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Each KW12-3 switch is rated for AC 125V–250V and a maximum current of 5A. They are suitable for typical low-to-medium power switching tasks in household appliances, automation systems, and electronic equipment within these ratings.\"}}, {\"@type\": \"Question\", \"name\": \"Can these switches be used in outdoor or high-temperature environments?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These switches are designed for an operating temperature range of -40°C to 70°C, making them suitable for a broad range of environments. However, they are not sealed or weatherproof, so for outdoor or high-humidity applications additional housing or protection is recommended.\"}}]}\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:\/\/vd0uzy-jp.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Soldering \u0026 Electrical\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/collections\/soldering-electrical\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"10pcs KW12-3 Roller Lever Micro Limit Switch PCB NO\/NC 5A\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/products\/kw12-3-roller-lever-micro-limit-switch-pcb-terminals-10pcs\"}]}\u003c\/script\u003e","brand":"Peaceful Pleasures Health and Wellness","offers":[{"title":"Default Title","offer_id":53668140122425,"sku":"4000320498332-Default Title","price":13.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/3689\/5801\/files\/He9508c76dd4b448f8baafa02b7b545ecn.webp?v=1783035739","url":"https:\/\/peacefulpleasureswellness.com\/products\/kw12-3-roller-lever-micro-limit-switch-pcb-terminals-10pcs","provider":"Peaceful Pleasures Health and Wellness","version":"1.0","type":"link"}