{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK1112-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK1112-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3SK1112-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3SK1112-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SK1112-1BB40 safety relay, solid-state enabling circuits, SIL 3 / PL e, 24 V DC, screw terminals, 22.5 mm width.","salesMarkdown":"The SIL 3 / PL e rating means this relay can be used in safety functions up to the highest performance level for single-channel architectures — suitable for guarding applications like light curtains, two-hand controls, and emergency stop circuits where the required safety integrity demands a proven component. The safe failure fraction (SFF) of 99 % indicates that over 99 % of dangerous failures are detected by the internal diagnostics, a key figure for achieving SIL 3 without redundancy. The 24 V DC coil is the standard control voltage for industrial safety circuits. The relay includes both a start input and a feedback input, allowing monitored manual or automatic start and external contactor monitoring — typical for E-stop and guard door circuits that need to detect welded contacts downstream. Screw-type terminals accept solid wire 1x (20…14 AWG) or 2x (18…16 AWG), and stranded wire 1x (20…16 AWG) or 2x (20…16 AWG). With ferrule, the range is 1x (0.5…2.5 mm²) or 2x (0.5…1.0 mm²). This covers most panel wiring up to 2.5 mm² without special tools. Shock resistance is 10g / 11 ms, and mounting position is any, giving flexibility in cabinet layout. The maximum operating frequency is 2000 switching cycles per hour.","metaTitle":"Siemens 3SK1112-1BB40 SIRIUS Safety Relay, SIL 3/PL e, 24 V","metaDescription":"Siemens 3SK1112-1BB40 SIRIUS safety relay. SIL 3 (IEC 61508), PL e (ISO 13849-1). 24 V DC, 22.5 mm wide, screw terminals. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Safety Relays"],"specifications":{"Depth":"91.6 mm","Solid":"1x (20 ... 14), 2x (18 ... 16)","Width":"22.5 mm","at DC":"0.8 ... 1.2","Height":"100 mm","Maximum":"85 ms","Typical":"6 500 ms","Stranded":"1x (20 ... 16), 2x (20 ... 16)","Rated Value":"24 V","Start Input":"Yes","Safety Switch":"Yes","at DC maximum":"85 ms","During Storage":"-40 ... +80 °C","Feedback Input":"Yes","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting","Product Category":"Safety relays","Shock Resistance":"10g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"safety relays","Overvoltage Category":"3","Design Of The Product":"Solid-state enabling circuits","Instantaneous Contact":"2","according to IEC 61508":"3","according to IEC 62061":"3","power loss [W] maximum":"2 W","Design Of The Cascading":"yes","Safety-Related Circuits":"Yes","EMC emitted interference":"IEC 60947-5-1, Class A","With Core End Processing":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.0 mm²)","according to ISO 13849-1":"e","Of The Sensor Input Minimum":"60 ms","Operating Frequency Maximum":"2 000 1/h","Safe failure fraction (SFF)":"99 %","Type Of Electrical Connection":"screw-type terminals","Insulation Voltage Rated Value":"50 V","Monitoring Of Floating Sensors":"Yes","Product Function Parameterizable":"sensor floating / sensor non-floating, monitored start-up / automatic start, 1-channel / 2-channel sensor connection, cross-circuit detection, startup testing","Safety-Related Delayed Switching":"0","Monitoring Of Non-Floating Sensors":"Yes","Relative Humidity During Operation":"10 ... 95 %","air pressure according to SN 31205":"90 ... 106 kPa","of the ON pushbutton input minimum":"0.15 s","Product Feature Cross-Circuit-Proof":"Yes","Cascading Input/Functional Switching":"Yes","Safety-Related Instantaneous Contact":"0","Surge Voltage Resistance Rated Value":"800 V","category according to EN ISO 13849-1":"4","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.","Magnetically Operated Switch Monitoring":"Yes","reference code according to IEC 81346-2":"F","Recovery Time After Power Failure Typical":"6.5 s","Suitability For Interaction Press Control":"No","Touch Protection Against Electrical Shock":"finger-safe","of semiconductor outputs at DC-13 at 24 V":"2 A","safety device type according to IEC 61508-2":"Type B","For Signaling Function Instantaneous Contact":"1","Type Of Electrical Connection Plug-In Socket":"No","Type Of Voltage Of The Control Supply Voltage":"DC","Number Of Sensor Inputs 1-Channel Or 2-Channel":"1","Required Spacing For Grounded Parts At The Side":"5 mm","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: 0.75 mm","PFHD with high demand rate according to EN 62061":"1E-9 1/h","suitability for operation device connector 3ZY12":"No","PFDavg with low demand rate according to IEC 61508":"7E-6","Installation Altitude At Height Above Sea Level Maximum":"4 000 m; Derating, see Product Notification 109792701","Recovery Time After Opening Of The Safety Circuits Typical":"30 ms","Backslide Delay Time After Opening Of The Safety Circuits Typical":"40 ms","design of the fuse link for short-circuit protection of the NO contacts of the relay outputs required":"not required"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SK1112-1BB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SK1112-1BB40 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing — no stock or price figures are published here."},{"question":"What is the depth of 3SK1112-1BB40?","answer":"The depth is 91.6 mm, with a width of 22.5 mm and height of 100 mm."},{"question":"What solid wire sizes does the 3SK1112-1BB40 accept?","answer":"Screw terminals accept solid wire 1x (20…14 AWG) or 2x (18…16 AWG). Stranded wire 1x (20…16 AWG) or 2x (20…16 AWG). With ferrule: 1x (0.5…2.5 mm²) or 2x (0.5…1.0 mm²)."},{"question":"What compliance documentation does Siemens provide for 3SK1112-1BB40?","answer":"The relay is certified to IEC 61508 (SIL 3), IEC 62061 (SIL 3), and ISO 13849-1 (PL e). EMC emitted interference meets IEC 60947-5-1, Class A. The product is part of the SIRIUS brand from Siemens."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK1112-1BB40","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/3SK1112-1BB40 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}}