{"product_id":"10pcs-kw12-3-micro-roller-lever-limit-switch-pcb-mount","title":"10Pcs KW12-3 Micro Roller Lever Limit Switch PCB Mount","description":"\n\u003ch2\u003e10-Pack KW12-3 Micro Roller Lever Arm Limit Switch — PCB Mount\u003c\/h2\u003e\n\u003cp\u003eGet reliable, snap-action switching performance with this set of \u003cstrong\u003e10 KW12-3 Micro Roller Lever Limit Switches\u003c\/strong\u003e. Compact, fast-acting, and rated for a wide range of voltages and temperatures, these PCB-mount micro switches are a go-to choice for electronics engineers, hobbyists, and DIY builders alike. Whether you're building automation systems, repairing appliances, or prototyping robotics, these switches deliver consistent open\/close actuation every time.\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\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\u003eTerminal Type:\u003c\/strong\u003e PCB (Printed Circuit Board) terminals\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActuator:\u003c\/strong\u003e Roller lever arm for precise mechanical triggering\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable plastic housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eThe KW12-3 uses a proven snap-action reed mechanism. An external mechanical force — applied via the roller lever arm — acts on the internal spring reed. At a critical actuation point, the reed snaps instantaneously, rapidly opening or closing the contact circuit. When the force is removed, the reed reverses and resets with equal speed. This snap-action design ensures:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMinimal contact gap with \u003cstrong\u003eshort, precise travel\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast-break\/fast-make\u003c\/strong\u003e switching action\u003c\/li\u003e\n  \u003cli\u003eLow actuation force requirement\u003c\/li\u003e\n  \u003cli\u003eConsistent and repeatable performance across many cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWide Range of Applications\u003c\/h3\u003e\n\u003cp\u003eThese versatile micro switches are suitable for use in:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComputer mice and peripheral devices\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 household appliances (microwave ovens, rice cookers, etc.)\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\u003eDIY robotics and 3D printers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\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: The KW12-3 limit switches are rated for AC 125V to 250V with a current rating of 5A, making them compatible with a broad range of low-to-mid voltage electronic applications including appliances, automation systems, and DIY electronics projects.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these KW12-3 micro switches suitable for PCB mounting?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The KW12-3 switches feature PCB terminal connections, designed to be soldered directly onto a printed circuit board. Their compact 20 × 10 × 6 mm footprint makes them ideal for space-constrained board layouts.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can these limit switches be used in extreme temperature environments?\u003c\/h4\u003e\n\u003cp\u003eA: These micro switches have an operating temperature range of -40°C to 70°C, making them suitable for both cold-storage automation and moderately high-heat environments such as appliance interiors or outdoor enclosures.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many switches are included in the pack?\u003c\/h4\u003e\n\u003cp\u003eA: Each order includes 10 individual KW12-3 micro roller lever limit switches, giving you spares for prototyping, repairs, or multi-unit builds at an excellent value.\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\": \"The KW12-3 limit switches are rated for AC 125V to 250V with a current rating of 5A, making them compatible with a broad range of low-to-mid voltage electronic applications including appliances, automation systems, and DIY electronics projects.\"}}, {\"@type\": \"Question\", \"name\": \"Are these KW12-3 micro switches suitable for PCB mounting?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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