{"product_id":"kw11-3z-micro-limit-switch-with-lever-3-pin-spdt-5a-250vac","title":"SC7301 Micro Limit Switch with Lever – 3-Pin SPDT 5A 250VAC","description":"\u003cstyle\u003e\n.nznpd{--o:#F57C00;--od:#E65100;--ink:#0F172A;--mut:#5b6573;--line:#E8ECF0;--soft:#F7F8FA;max-width:1120px;margin:0 auto;color:var(--ink);font-family:inherit;line-height:1.6}\n.nznpd,.nznpd *{box-sizing:border-box}\n.nznpd p{margin:0;color:var(--mut);font-size:15px;line-height:1.65}\n.nznpd strong{color:var(--ink)}\n.nznpd__intro{font-size:16px;color:var(--ink);font-weight:500;line-height:1.6}\n.nznpd__checks{list-style:none;padding:0;margin:22px 0 0;column-count:2;column-gap:26px}\n.nznpd__checks li{display:flex;gap:11px;align-items:flex-start;font-size:15px;color:var(--ink);line-height:1.45;break-inside:avoid;-webkit-column-break-inside:avoid;margin-bottom:13px}\n.nznpd__checks li::before{content:\"\\2713\";flex:0 0 auto;width:21px;height:21px;margin-top:1px;border-radius:999px;background:#FFF3E8;color:var(--o);font-size:12px;font-weight:900;line-height:21px;text-align:center}\n.nznpd__qs{background:linear-gradient(170deg,#FFF9F3,#FFF1E6);border:2px solid #FCE0C6;border-radius:16px;padding:22px}\n.nznpd__qs h3{margin:0 0 16px;font-size:12px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--od)}\n.nznpd__steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;gap:14px}\n.nznpd__steps li{display:grid;grid-template-columns:27px 1fr;gap:12px}\n.nznpd__steps li::before{counter-increment:s;content:counter(s);width:27px;height:27px;border-radius:999px;background:#fff;border:2px solid #FCE0C6;color:var(--od);font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center}\n.nznpd__steps strong{display:block;font-size:14px}\n.nznpd__steps p{font-size:13px;margin-top:2px;line-height:1.45}\n.nznpd__block{margin-top:36px;padding-top:30px;border-top:1px solid var(--line)}\n.nznpd__h{margin:0 0 28px;font-size:1.15rem;font-weight:800;letter-spacing:-.02em;color:var(--ink);display:flex;align-items:center;gap:10px}\n.nznpd__h::before{content:\"\";flex:0 0 auto;width:20px;height:3px;border-radius:2px;background:var(--o)}\n.nznpd__specs{border:2px solid var(--line);border-radius:12px;overflow:hidden}\n.nznpd__spec{display:grid;grid-template-columns:minmax(150px,.7fr) 1fr;gap:18px;padding:12px 16px;font-size:14px}\n.nznpd__spec:nth-child(odd){background:var(--soft)}\n.nznpd__spec span{color:var(--mut)}\n.nznpd__spec strong{font-weight:700}\n.nznpd__included{display:flex;gap:16px;align-items:center;border:2px solid var(--line);border-radius:16px;background:var(--soft);padding:18px 20px}\n.nznpd__qty{flex:0 0 auto;width:46px;height:46px;border-radius:12px;background:#FFF3E8;color:var(--o);font-weight:800;display:flex;align-items:center;justify-content:center}\n.nznpd__included strong{display:block;font-size:15px;margin-bottom:3px}\n.nznpd__uses{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}\n.nznpd__use{padding:13px 14px;background:var(--soft);border-left:3px solid var(--o);border-radius:0 10px 10px 0;font-size:14px;color:var(--ink);line-height:1.4}\n.nznpd__faqs{display:grid;gap:10px}\n.nznpd__faq{border:2px solid var(--line);border-radius:12px;background:#fff;padding:0 16px;transition:border-color .18s ease}\n.nznpd__faq[open]{border-color:#FCE0C6}\n.nznpd__faq summary{list-style:none;cursor:pointer;padding:15px 0;font-weight:700;font-size:14px;color:var(--ink);display:flex;justify-content:space-between;align-items:center;gap:12px}\n.nznpd__faq summary::-webkit-details-marker{display:none}\n.nznpd__faq summary::after{content:\"\\203A\";flex:0 0 auto;color:var(--o);font-weight:800;font-size:20px;line-height:1;display:inline-block;transform:rotate(90deg);transition:transform .22s ease}\n.nznpd__faq[open] summary::after{transform:rotate(-90deg)}\n.nznpd__faq p{padding:0 0 16px;font-size:14px}\n.nznpd__faq[open] p{animation:nznpdReveal .24s ease}\n@keyframes nznpdReveal{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}\n.nznpd p.nznpd__note{margin-top:16px;background:var(--soft);border:2px solid var(--line);border-radius:12px;padding:14px 16px;font-size:13.5px;color:var(--mut);line-height:1.55}\n@media(prefers-reduced-motion:reduce){.nznpd__faq summary::after{transition:none}.nznpd__faq[open] p{animation:none}}\n@media(max-width:749px){.nznpd__checks{column-count:1}.nznpd__uses{grid-template-columns:1fr}.nznpd__spec{grid-template-columns:1fr;gap:2px}}\n\u003c\/style\u003e\n\u003cdiv class=\"nznpd\"\u003e\n\u003cdiv class=\"nznpd__lead\"\u003e\n\u003cp class=\"nznpd__intro\"\u003eThe SC7301 is a compact 3-pin SPDT micro limit switch fitted with a sprung lever arm, rated 5A at 250VAC. It's the lever-arm switch in the popular KW11-3Z endstop family — a go-to position sensor for 3D printers, CNC machines, laser cutters and DIY automation. The lever gives smooth, low-force triggering as a cam, carriage, gantry or door sweeps past, and its three terminals (common, normally-open and normally-closed) let you wire it as either a normally-open or normally-closed trigger. A snap-action mechanism delivers a crisp, repeatable click every time.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cul class=\"nznpd__checks\"\u003e\n\u003cli\u003eSPDT contacts — one common (C), one normally-open (NO) and one normally-closed (NC) terminal\u003c\/li\u003e\n\u003cli\u003eSprung lever arm — smooth, low-force triggering as a target sweeps past\u003c\/li\u003e\n\u003cli\u003eRated 5A at 250VAC — handles mains or low-voltage DC switching\u003c\/li\u003e\n\u003cli\u003eSnap-action mechanism for a sharp, repeatable trigger point\u003c\/li\u003e\n\u003cli\u003eLong life — rated for over 1,000,000 operating cycles\u003c\/li\u003e\n\u003cli\u003eLow contact resistance — ≤50 mΩ\u003c\/li\u003e\n\u003cli\u003eHigh insulation resistance — ≥100 MΩ\u003c\/li\u003e\n\u003cli\u003eDielectric strength ≥1000VAC for 1 minute\u003c\/li\u003e\n\u003cli\u003eKW11-3Z-style body and mounting — drops into standard endstop brackets\u003c\/li\u003e\n\u003cli\u003eIdeal as a 3D printer \/ CNC endstop or door \/ limit sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eSpecifications\u003c\/h3\u003e\n\u003cbr\u003e\n\u003cdiv class=\"nznpd__specs\"\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eModel\u003c\/span\u003e\u003cstrong\u003eSC7301\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eType\u003c\/span\u003e\u003cstrong\u003e3-pin SPDT lever micro limit switch\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eCompatibility\u003c\/span\u003e\u003cstrong\u003eKW11-3Z-style endstop mounts\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eContact Form\u003c\/span\u003e\u003cstrong\u003eSPDT — 1 common, 1 NO, 1 NC\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eTerminals\u003c\/span\u003e\u003cstrong\u003e3 pins (C \/ NO \/ NC) — solder or spade\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eActuator\u003c\/span\u003e\u003cstrong\u003eSprung lever arm\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eRated Current \/ Voltage\u003c\/span\u003e\u003cstrong\u003e5A 250VAC\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eContact Resistance\u003c\/span\u003e\u003cstrong\u003e≤50 mΩ\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eInsulation Resistance\u003c\/span\u003e\u003cstrong\u003e≥100 MΩ\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eDielectric Strength\u003c\/span\u003e\u003cstrong\u003e≥1000VAC for 1 minute\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eMechanical \/ Electrical Life\u003c\/span\u003e\u003cstrong\u003e≥1,000,000 cycles\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eMounting\u003c\/span\u003e\u003cstrong\u003e2 × mounting holes\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eWhat's in the pack\u003c\/h3\u003e\n\u003cbr\u003e\n\u003cdiv class=\"nznpd__included\"\u003e\n\u003cdiv class=\"nznpd__qty\"\u003e×\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSC7301 Lever Micro Limit Switches\u003c\/strong\u003e\n\u003cp\u003eQuantity as selected. Ready to wire — no extra components required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eGreat for\u003c\/h3\u003e\n\u003cbr\u003e\n\u003cdiv class=\"nznpd__uses\"\u003e\n\u003cdiv class=\"nznpd__use\"\u003e3D printer X \/ Y \/ Z endstops\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eCNC and laser-cutter travel limits\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eDoor, lid and drawer detection\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eRobotics bump and contact sensors\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eConveyor and gantry end-of-travel limits\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eGeneral DIY automation and Arduino projects\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003cdiv class=\"nznpd__qs\"\u003e\n\u003ch3\u003eGetting started\u003c\/h3\u003e\n\u003col class=\"nznpd__steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eIdentify the three terminals\u003c\/strong\u003e\n\u003cp\u003eThe pins are common (C), normally-open (NO) and normally-closed (NC). On most SC7301 \/ KW11-3Z bodies the centre pin is the common; check the moulded markings or test with a multimeter in continuity mode.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eChoose NO or NC\u003c\/strong\u003e\n\u003cp\u003eWire C + NO for a circuit that closes (turns on) when the lever is pressed, or C + NC for one that opens (turns off) when pressed. For 3D printer \/ CNC endstops, NC wiring is often preferred so a broken wire reads as triggered.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eMount the switch\u003c\/strong\u003e\n\u003cp\u003eFix it through the two mounting holes so the lever arm meets your moving part right at the travel limit. Leave a little over-travel so the switch fully actuates without bottoming out.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eTest the click\u003c\/strong\u003e\n\u003cp\u003eActuate the lever by hand — you should feel a firm snap and hear a distinct click as the contacts change over. Confirm the switching with a multimeter before wiring it into your machine.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eCommon questions\u003c\/h3\u003e\n\u003cbr\u003e\n\u003cdiv class=\"nznpd__faqs\"\u003e\n\u003cdetails class=\"nznpd__faq\" open\u003e\n\u003csummary\u003eWhen should I choose the lever version?\u003c\/summary\u003e\n\u003cp\u003eThe sprung lever arm is ideal where a cam, carriage, gantry or door sweeps past the switch — it gives smooth, low-force triggering and a bit of stand-off from the moving part. If your target presses the switch straight on in a tight space, the plain no-lever KW11-3Z is the better fit.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"nznpd__faq\"\u003e\n\u003csummary\u003eWhat do the three pins do?\u003c\/summary\u003e\n\u003cp\u003eThis is an SPDT (single-pole double-throw) switch. The common terminal (C) connects to the normally-closed (NC) contact when the switch is at rest, and to the normally-open (NO) contact when pressed. You only ever use two of the three pins for a given circuit — C plus whichever of NO or NC you need.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"nznpd__faq\"\u003e\n\u003csummary\u003eCan I use it as a 3D printer or CNC endstop?\u003c\/summary\u003e\n\u003cp\u003eYes — the SC7301 is the lever version of the hugely popular KW11-3Z endstop, used across 3D printers, CNC machines and laser cutters. Wire C + NC (or C + NO to match your board's logic) and connect to your controller's endstop input.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"nznpd__faq\"\u003e\n\u003csummary\u003eHow much can it switch?\u003c\/summary\u003e\n\u003cp\u003eIt's rated 5A at 250VAC, so it comfortably handles low-voltage logic signals (3.3V \/ 5V), DC loads and mains-voltage switching within that limit. Stay within the rating and observe normal mains-voltage safety practice when switching AC.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003cp class=\"nznpd__note\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e Two of the three terminals are used per circuit — common (C) plus either NO or NC. For machine endstops, NC wiring is commonly preferred so a damaged wire fails safe as \"triggered\". The switch is rated to 5A \/ 250VAC; keep within that limit and follow standard mains-voltage safety practice when switching AC.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"NZN Electronics","offers":[{"title":"Default","offer_id":42896612655200,"sku":"SW-KW11-3Z-3PIN-LV","price":1.75,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/SC7301Topdowntopdown.png?v=1782280231","url":"https:\/\/www.nznelectronics.co.nz\/products\/kw11-3z-micro-limit-switch-with-lever-3-pin-spdt-5a-250vac","provider":"NZN Electronics","version":"1.0","type":"link"}