{"product_id":"20pcs-micro-limit-switch-3pin-push-button-1a-125v-ac-13-5mm","title":"20PCS 3-Pin Micro Limit Switch 1A 125V AC Push Button 13.5mm","description":"\n\u003ch2\u003e20-Pack Micro Limit Switch — 3-Pin Push Button, 1A 125V AC, 13.5mm Stalk\u003c\/h2\u003e\n\u003cp\u003eStock up your workbench with this convenient 20-piece set of compact micro limit switches. Rated at 1A \/ 125V AC with a 13.5mm actuator stalk length and a reliable 3-pin configuration, these push button switches are a go-to choice for electronics repairs, DIY projects, robotics, automation, and control-circuit builds. Made from durable plastic, they deliver consistent, snap-action performance in a small, easy-to-mount footprint.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePack Size:\u003c\/strong\u003e 20 pieces — great value for prototyping and repairs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical Rating:\u003c\/strong\u003e 1A, 125V AC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePin Count:\u003c\/strong\u003e 3 pins (Common, Normally Open, Normally Closed)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActuator Stalk Length:\u003c\/strong\u003e 13.5mm for precise triggering\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSwitch Action:\u003c\/strong\u003e Snap-action push button (momentary)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Sturdy plastic housing for lightweight durability\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e Mouse button replacement, limit sensing, CNC machines, 3D printers, conveyor controls, robotics, and more\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n    \u003cth style=\"text-align:left; padding:8px; border:1px solid #ddd;\"\u003eSpecification\u003c\/th\u003e\n    \u003cth style=\"text-align:left; padding:8px; border:1px solid #ddd;\"\u003eDetail\u003c\/th\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eQuantity\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e20 PCS\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eRated Current\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1A\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eRated Voltage\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e125V AC\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003ePin Configuration\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e3 Pins (COM \/ NO \/ NC)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eStalk Length\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e13.5mm\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eHousing Material\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003ePlastic\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eCountry of Origin\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMade in Mainland China\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eWhether you're a maker, hobbyist, electrical engineer, or repair technician, this 20-pack of micro switches provides the quantity you need at a budget-friendly price. They're especially popular as mouse-click button replacements, end-stop sensors in 3D printers and CNC routers, and general-purpose position-detection switches in automation setups.\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 is the difference between the NO and NC terminals on a 3-pin micro switch?\u003c\/h4\u003e\n\u003cp\u003eA: A 3-pin micro switch has three terminals: COM (Common), NO (Normally Open), and NC (Normally Closed). When the actuator is not pressed, the circuit between COM and NC is closed (current flows), while the circuit between COM and NO is open (no current). Pressing the actuator reverses this — COM–NO closes and COM–NC opens. Use NO for circuits you want active only when the button is pressed, and NC for circuits you want active by default.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these micro limit switches suitable for 3D printer end stops?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! These 3-pin, 1A 125V AC micro switches are widely used as end-stop limit switches in 3D printers. The 13.5mm actuator stalk provides reliable triggering at consistent positions, and the snap-action mechanism ensures precise, repeatable signals for your printer's control board.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use these switches to replace mouse click buttons?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. These are a common replacement part for computer mouse buttons. The compact footprint and standard 3-pin layout make them compatible with many mouse PCB designs. Always confirm the physical dimensions and pin spacing match your specific mouse model before soldering.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What projects can I use this 20-pack of micro switches for?\u003c\/h4\u003e\n\u003cp\u003eA: These micro limit switches are versatile components suitable for CNC machine end stops, robotic arm position sensing, conveyor belt control systems, arcade joystick buttons, DIY electronics prototyping, appliance repairs, and any project that requires momentary push-button switching up to 1A \/ 125V AC.\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 difference between the NO and NC terminals on a 3-pin micro switch?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 3-pin micro switch has three terminals: COM (Common), NO (Normally Open), and NC (Normally Closed). When the actuator is not pressed, the circuit between COM and NC is closed (current flows), while the circuit between COM and NO is open (no current). Pressing the actuator reverses this — COM–NO closes and COM–NC opens. 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