{"product_id":"3tk2821-1cb30-siemens-safety-relay","title":"3TK2821-1CB30 | Siemens Safety Relay","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003eThe Siemens 540-155 is a protective enclosure for terminal equipment controllers, offering secure mounting and environmental shielding in HVAC and building automation systems.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable width=\"100%\" style=\"height: 335px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 22.4px;\"\u003e\n\u003cth style=\"width: 20.8737%; text-align: left; height: 22.4px;\" class=\"text-left text-body1 text-bold py-10 pr-10 desktop:pr-[10rem] desktop:text-nowrap\"\u003eCondition\u003c\/th\u003e\n\u003ctd style=\"width: 78.9569%; height: 22.4px;\" class=\"text-left text-body1 py-10 desktop:w-[60%]\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 20.8737%; text-align: left; height: 19.6px;\" class=\"text-left text-body1 text-bold py-10 pr-10 desktop:pr-[10rem] desktop:text-nowrap\"\u003eBrand\u003c\/th\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\" class=\"text-left text-body1 py-10 desktop:w-[60%]\"\u003e\u003cspan data-sheets-root=\"1\"\u003eSiemens\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 20.8737%; text-align: left; height: 19.6px;\"\u003eCategory\u003c\/th\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003eSafety Systems\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 20.8737%; text-align: left; height: 19.6px;\"\u003ePart Number\u003c\/th\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan data-sheets-root=\"1\"\u003e3TK2821-1CB30\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 20.8737%; text-align: left; height: 19.6px;\"\u003eSubcategory\u003c\/th\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003eSafety Relay\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 19.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eSeries\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003eSIRIUS\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 19.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eControl Voltage\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003e24 VAC\/DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 39.2px;\"\u003e\u003cstrong\u003e\u003cspan\u003eOutput Configuration\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 39.2px;\"\u003e\u003cspan\u003e Normally Open (N\/O), 1 Normally Closed (N\/C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 19.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eStart Function\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003eAutomatic or Manual Start selectable\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 19.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eOutput Type\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003eRelay enabling circuits\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 19.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eSafety Level\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003eSuitable for applications up to SIL 3 \/ PL e (with proper wiring)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 19.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eTerminal Type\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003eScrew terminals\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 19.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eHousing Width\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 19.6px;\"\u003e\u003cspan\u003e22.5 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 39.2px;\"\u003e\u003cstrong\u003e\u003cspan\u003eProtection Feature\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 39.2px;\"\u003e\u003cspan\u003eFinger-safe terminals\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18.6px;\"\u003e\n\u003ctd style=\"width: 20.8737%; height: 18.6px;\"\u003e\u003cstrong\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 78.9569%; height: 18.6px;\"\u003e\u003cspan\u003e0.247 kgs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003cspan style=\"font-size: 0.875rem;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About 3TK2821-1CB30\u003c\/h4\u003e\n\u003cp data-start=\"0\" data-end=\"317\"\u003eThe\u003cstrong\u003e \u003c\/strong\u003eSiemens 3TK2821-1CB30 is a compact safety relay from the SIRIUS series, designed for monitoring emergency stop and safety circuits in industrial automation systems. It ensures dependable shutdown of hazardous operations, meeting stringent safety requirements in manufacturing and machine control applications.\u003c\/p\u003e\n\u003ch4 data-start=\"0\" data-end=\"317\"\u003eKey Features:\u003c\/h4\u003e\n\u003cul data-start=\"347\" data-end=\"946\"\u003e\n\u003cli data-start=\"347\" data-end=\"422\"\u003e\n\u003cp data-start=\"349\" data-end=\"422\"\u003eProduct Type: Safety relay for emergency stop and safety monitoring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"423\" data-end=\"445\"\u003e\n\u003cp data-start=\"425\" data-end=\"445\"\u003eSeries: SIRIUS\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"446\" data-end=\"480\"\u003e\n\u003cp data-start=\"448\" data-end=\"480\"\u003eControl Voltage: 24 VAC\/DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"481\" data-end=\"590\"\u003e\n\u003cp data-start=\"483\" data-end=\"590\"\u003eOutput Configuration: 3 Normally Open (N\/O) enabling outputs, 1 Normally Closed (N\/C) feedback output\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"591\" data-end=\"650\"\u003e\n\u003cp data-start=\"593\" data-end=\"650\"\u003eStart Options: Selectable automatic or manual start\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"651\" data-end=\"695\"\u003e\n\u003cp data-start=\"653\" data-end=\"695\"\u003eOutput Type: Relay enabling circuits\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"696\" data-end=\"734\"\u003e\n\u003cp data-start=\"698\" data-end=\"734\"\u003eTerminal Type: Screw terminals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"735\" data-end=\"786\"\u003e\n\u003cp data-start=\"737\" data-end=\"786\"\u003eHousing Width: 22.5 mm (DIN-rail mountable)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"787\" data-end=\"866\"\u003e\n\u003cp data-start=\"789\" data-end=\"866\"\u003eSafety Certification: SIL 3 (IEC 61508), PL e (ISO 13849-1), Category 4\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"867\" data-end=\"946\"\u003e\n\u003cp data-start=\"869\" data-end=\"946\"\u003eProtection Features: Finger-safe terminals for enhanced operator safety\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"953\" data-end=\"1263\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eThis safety relay is ideal for use in e-stop circuits, safety door monitoring, and other safety-critical applications in machine and process control. Its compact design, reliable switching performance, and compliance with international safety standards make it a key component in industrial automation systems.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":49105333616896,"sku":"3TK2821-1CB30","price":432.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/shopping_78_120cd275-baed-4781-aa70-81447db3290f.webp?v=1785545094","url":"https:\/\/alotechparts.com\/products\/3tk2821-1cb30-siemens-safety-relay","provider":"Alo Tech Solutions","version":"1.0","type":"link"}