{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3TK2851-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3TK2851-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3TK2851-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3TK2851-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"SIRIUS safety relay with contactor relay enabling circuits (EC) 24 V DC, 90 mm Screw terminal EC instantaneous: 2 NO EC delayed: 0 SC: 1NC Autostart/monitored start Basic device Maximum achieved SIL: 2, PL: d","salesMarkdown":null,"metaTitle":null,"metaDescription":null,"metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Safety Relays"],"specifications":{"Depth":"108 mm","Solid":"2x (24 ... 18)","Width":"90 mm","at DC":"0.85 ... 1.1","Height":"132 mm","Maximum":"120 ms","Typical":"100 ms","at 24 V":"10 A","Stranded":"2x (24 ... 18)","at 115 V":"6 A","at 230 V":"6 A","Start Input":"Yes","UL approval":"Yes","Safety Switch":"Yes","at DC maximum":"200 ms","During Storage":"-40 ... +80 °C","Feedback Input":"Yes","Automatic Start":"Yes","BG BIA approval":"Yes","lifecycle_stage":"mature","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting","Shock Resistance":"5g / 11 ms","Valve Monitoring":"No","Delayed Switching":"0","Mounting Position":"any","at DC rated value":"24 V","Monitored Start-Up":"Yes","Product Brand Name":"SIRIUS","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 5 mA)","Product Designation":"safety relays","Design Of The Product":"for EMERGENCY-STOP and safety doors","Instantaneous Contact":"0","Standstill Monitoring":"No","1-Channel Or 2-Channel":"1","EMERGENCY OFF function":"Yes","Light Array Monitoring":"No","according to IEC 61508":"2","Safety-Related Circuits":"Yes","EMC emitted interference":"IEC 60947-5-1, IEC 60000-4-3, IEC 60000-4-5, IEC 60000-4-6","Laser Scanner Monitoring":"No","Light Barrier Monitoring":"No","With Core End Processing":"1x (0.25 ... 2.5 mm²), 2x (0.25 ... 1.0 mm²)","Rotation Speed Monitoring":"No","Tactile Sensor Monitoring":"No","Position Switch Monitoring":"Yes","Protective Door Monitoring":"Yes","Of The Sensor Input Minimum":"20 ms","Operating Frequency Maximum":"1 000 1/h","Type Of Electrical Connection":"screw-type terminals","Insulation Voltage Rated Value":"690 V","Monitoring Of Floating Sensors":"Yes","Of The Cascading Input Minimum":"0.02 s","EMERGENCY-OFF circuit monitoring":"Yes","Safety-Related Delayed Switching":"0","Pressure-Sensitive Mat Monitoring":"No","DC resistance of the cable maximum":"250 Ω","Monitoring Of Non-Floating Sensors":"No","Relative Humidity During Operation":"10 ... 95 %","air pressure according to SN 31205":"90 ... 106 kPa","of the ON pushbutton input minimum":"0.02 s","Product Feature Cross-Circuit-Proof":"Yes","protection class IP of the terminal":"IP20","Cascading Input/Functional Switching":"No","Safety-Related Instantaneous Contact":"2","Surge Voltage Resistance Rated Value":"6 000 V","category according to EN ISO 13849-1":"3","protection class IP of the enclosure":"IP20","stop category according to EN 60204-1":"0","installation environment regarding EMC":"This product is suitable for Class A environments only. In household environments, this device can cause unwanted radio interference. The user is required to implement appropriate measures in this case.","reference code according to EN 61346-2":"F","Magnetically Operated Switch Monitoring":"No","Contact Reliability Of Auxiliary Contacts":"< 1 error per 100 million operating cycles","Recovery Time After Power Failure Typical":"0.02 s","Suitability For Interaction Press Control":"No","Touch Protection Against Electrical Shock":"finger-safe","safety device type according to IEC 61508-2":"Type B","For Signaling Function Instantaneous Contact":"1","Type Of Electrical Connection Plug-In Socket":"Yes","Type Of Voltage Of The Control Supply Voltage":"DC","magnetically operated switch monitoring NC-NC":"Yes","magnetically operated switch monitoring NC-NO":"No","Type Of The Safety-Related Wiring Of The Inputs":"single-channel and two-channel","hardware fault tolerance according to IEC 61508":"1","vibration resistance according to IEC 60068-2-6":"5 ... 500 Hz: 0,075 mm","PFHD with high demand rate according to EN 62061":"1.1E-8 1/h","SIL Claim Limit (subsystem) according to EN 62061":"2","Mechanical Service Life (Operating Cycles) Typical":"30 000 000","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Recovery Time After Opening Of The Safety Circuits Typical":"20 ms","Backslide Delay Time After Opening Of The Safety Circuits Typical":"30 ms","design of the fuse link for short-circuit protection of the NO contacts of the relay outputs required":"gL/gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3TK2851-1BB40/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3TK2851-1BB40","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3TK2851-1BB40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}