{"product_id":"kw12-micro-limit-switch-ts-1d3-16mm-lever-10-pack","title":"KW12 Micro Limit Switch TS-1D3 — 16 mm Straight Lever, 3-Pin SPDT, 5 A 250 V, Copper Contacts (10-Pack)","description":"\u003cp\u003e\u003cstrong\u003eA micro limit switch is a small snap-action switch with a lever that changes state when a moving part touches it. The TS-1D3 (KW12 family) has SPDT copper contacts rated 5 A at 250 V, a 16 mm straight lever and three pins, so it can be wired normally-open or normally-closed without changing the part.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe plain, dependable micro limit switch that ends up in every machine you build. SPDT copper contacts rated 5 A at 250 V, a 16 mm straight lever for a generous actuation arc, and three pins so you can wire it normally-open or normally-closed without changing parts.\n\nSold in packs of ten, because in practice you never need just one — a three-axis machine wants three for homing, and the spares live in the drawer until the next build.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e3D printer X\/Y\/Z endstops and filament runout detection\u003c\/li\u003e\n\u003cli\u003eCNC router, laser and plotter axis limits and homing switches\u003c\/li\u003e\n\u003cli\u003eRobot arm and linear actuator end-of-travel protection\u003c\/li\u003e\n\u003cli\u003eDoor, guard and drawer interlocks on machines and enclosures\u003c\/li\u003e\n\u003cli\u003eGeneral DIY detection — lid open, tray present, arm at rest\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003e3D printer and CNC builders, robotics hobbyists, makerspaces and maintenance technicians who go through limit switches in quantity and want a known 5 A copper-contact part rather than the cheapest unmarked one.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eControllers: Marlin, Klipper, GRBL, RepRap boards, Arduino, Raspberry Pi and PLC digital inputs\u003c\/li\u003e\n\u003cli\u003eWiring: three pins — COM, NO and NC — so the same switch serves normally-open or normally-closed logic\u003c\/li\u003e\n\u003cli\u003eRating: 5 A at 250 V AC; for low-voltage logic inputs add the usual pull-up or pull-down in your controller\u003c\/li\u003e\n\u003cli\u003eLever: 16 mm straight lever; the same KW12 family also offers roller, bent and no-lever versions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eTS-1D3 (KW12 family), 16 mm straight lever, 3 solder\/quick-connect pins\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContacts\u003c\/th\u003e\n\u003ctd\u003eSPDT (COM \/ NO \/ NC), copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRating\u003c\/th\u003e\n\u003ctd\u003e5 A 250 V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody\u003c\/th\u003e\n\u003ctd\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCertification\u003c\/th\u003e\n\u003ctd\u003eCCC, certificate 2020970304002085\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e10 switches per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical use\u003c\/th\u003e\n\u003ctd\u003e3D-printer and CNC endstops, machine travel limits, door and guard interlocks, robot axis homing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003e10 × TS-1D3, 16 mm straight lever, 3-pin:\u003c\/strong\u003e 10 × TS-1D3 micro limit switches\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eShipping and returns\u003c\/h2\u003e\u003cp\u003eShips from our warehouse in Singapore with tracking. Parts and accessories: free standard shipping on orders over $25 ($4.99 below) to Canada, the UK, EU, Japan, Korea, Australia and most other countries, 5–15 days; to the United States at carrier cost from $27.99 (SingPost) or $109.99 (DHL Express). Assembled robot-arm kits over 2 kg are built and calibrated to order in Singapore (dispatch in 7–10 business days) and ship worldwide at carrier cost: SingPost Speedpost Priority from $124.99 (10–14 business days) or DHL Express from $229.99 (3–5 business days), shown at checkout. 7-day returns; defective items are replaced or refunded with shipping covered. Import duties, where charged by your country, are paid by the recipient.\u003c\/p\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eHow do I wire this as a normally-closed endstop?\u003c\/h3\u003e\u003cp\u003eUse the COM pin and the NC pin. The circuit is closed at rest and opens when the lever is pressed, which is the safer choice for machine limits because a broken wire also trips the limit.\u003c\/p\u003e\u003ch3\u003eCan I use these as 3D printer endstops?\u003c\/h3\u003e\u003cp\u003eYes. They are the standard mechanical endstop type for Marlin, Klipper and GRBL machines. Wire COM and NC to your board's endstop header and set the endstop logic to match.\u003c\/p\u003e\u003ch3\u003eWhat is the difference between KW12 and TS-1D3?\u003c\/h3\u003e\u003cp\u003eKW12 is the family name for this small micro-switch format; TS-1D3 is the specific model — three pins with a 16 mm straight lever. They share the same body and mounting holes.\u003c\/p\u003e\u003ch3\u003eIs 5 A 250 V the real rating?\u003c\/h3\u003e\u003cp\u003eThat is the contact rating for AC mains switching, with copper contacts and a CCC certificate (2020970304002085). In typical endstop use you switch only a few milliamps at 3.3–5 V, far below the rating.\u003c\/p\u003e\u003ch3\u003eWhy buy ten?\u003c\/h3\u003e\u003cp\u003eA three-axis machine needs at least three for homing, and lever switches are a wear part. In practice a pack of ten covers a build plus spares.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"10 × TS-1D3, 16 mm straight lever, 3-pin","offer_id":50824103559407,"sku":"KW12-TS1D3-16-10","price":20.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_d5856357-0924-49e9-9449-47b0b2107bce.jpg?v=1789745414","url":"https:\/\/armdojo.com\/products\/kw12-micro-limit-switch-ts-1d3-16mm-lever-10-pack","provider":"ArmDojo","version":"1.0","type":"link"}