{"product_id":"kw12-3-micro-roller-lever-limit-switch-pcb-microswitch-10pcs","title":"10Pcs KW12-3 Micro Roller Lever Limit Switch PCB Microswitch","description":"\u003ch2\u003e10Pcs KW12-3 Micro Roller Lever Arm Limit Switch – PCB Microswitch\u003c\/h2\u003e\n\u003cp\u003eGet reliable, snap-action switching in a compact package. This pack of \u003cstrong\u003e10 KW12-3 micro roller lever limit switches\u003c\/strong\u003e delivers fast, precise open\/close triggering for a wide range of electronics, automation, and DIY projects. Built with PCB-mount terminals, these microswitches are easy to integrate into circuit boards and deliver consistent performance across thousands of cycles.\u003c\/p\u003e\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoller Lever Actuator:\u003c\/strong\u003e Smooth, consistent actuation via the roller lever arm for accurate positional triggering\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSnap-Action Mechanism:\u003c\/strong\u003e Instantaneous contact make\/break action ensures fast, clean switching with minimal bounce\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePCB Terminal Design:\u003c\/strong\u003e Solder-ready PCB terminals for straightforward circuit board integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature:\u003c\/strong\u003e Rated for -40°C to 70°C — suitable for demanding environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAC Rated:\u003c\/strong\u003e Handles AC 125V–250V at up to 5A current for versatile use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Measures just 20 × 10 × 6 mm (L × W × H) — fits tight enclosures with ease\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValue Pack:\u003c\/strong\u003e Comes with 10 switches so you always have spares on hand\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eKW12-3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActuator Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRoller Lever Arm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePCB \/ Circuit Board Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 125V – 250V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40°C to 70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 × 10 × 6 mm (L × W × H)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePVC Housing\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 pieces per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eThe KW12-3 uses a spring-loaded reed mechanism. When an external mechanical force (via roller, lever, or pin) acts on the actuator and reaches its critical travel point, the reed snaps instantaneously — making or breaking the circuit contact in a fraction of a second. When the force is removed, the spring reverses the action, resetting the switch. This snap-action design provides short stroke actuation, small contact spacing, and fast switching performance.\u003c\/p\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eComputer mice and pointing devices\u003c\/li\u003e\n  \u003cli\u003eAutomotive and vehicle electronics\u003c\/li\u003e\n  \u003cli\u003eCommunications and test equipment\u003c\/li\u003e\n  \u003cli\u003eSmall home appliances (microwave ovens, rice cookers)\u003c\/li\u003e\n  \u003cli\u003eGas water heaters and gas burners\u003c\/li\u003e\n  \u003cli\u003eFloating ball and fluid-level equipment\u003c\/li\u003e\n  \u003cli\u003eMedical and laboratory instruments\u003c\/li\u003e\n  \u003cli\u003eBuilding automation and control systems\u003c\/li\u003e\n  \u003cli\u003eElectric power tools\u003c\/li\u003e\n  \u003cli\u003e3D printers and CNC machines (end-stop switches)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\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\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the KW12-3 micro roller lever limit switch used for?\u003c\/h4\u003e\n\u003cp\u003eA: The KW12-3 PCB microswitch is widely used as a position\/limit sensor in electronics, automation systems, home appliances, 3D printers, CNC machines, and more. Its roller lever arm detects mechanical movement and triggers an instantaneous open or close circuit action.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these switches compatible with 3D printer end-stops?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The KW12-3 roller lever microswitch is one of the most popular choices for 3D printer end-stop and homing switches. Its compact size and PCB-mount terminals make it straightforward to install on most printer control boards.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What voltage and current do these microswitches support?\u003c\/h4\u003e\n\u003cp\u003eA: Each KW12-3 switch is rated for AC 125V–250V at up to 5A. This makes them suitable for a broad range of low-to-medium power electronic and automation applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I mount the KW12-3 microswitch?\u003c\/h4\u003e\n\u003cp\u003eA: The KW12-3 features PCB (printed circuit board) terminals, meaning you can solder them directly onto a circuit board. The compact 20 × 10 × 6 mm body also allows panel or bracket mounting using the pre-drilled holes on the switch body.\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 is the KW12-3 micro roller lever limit switch used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The KW12-3 PCB microswitch is widely used as a position\/limit sensor in electronics, automation systems, home appliances, 3D printers, CNC machines, and more. Its roller lever arm detects mechanical movement and triggers an instantaneous open or close circuit action.\"}}, {\"@type\": \"Question\", \"name\": \"Are these switches compatible with 3D printer end-stops?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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