{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK1122-2CB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK1122-2CB44","canonicalUrl":"https://aoctrl.com/siemens/3SK1122-2CB44","factsUrl":"https://aoctrl.com/api/mcp/products/3SK1122-2CB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS safety relay, 3SK1122-2CB44, solid-state enabling circuits, 24 VDC, push-in terminals, 22.5 mm width, SIL 3 / PL e.","salesMarkdown":"## Safety relay with solid-state enabling circuits The Siemens 3SK1122-2CB44 is a SIRIUS safety relay designed with solid-state enabling circuits, rated for 24 VDC control voltage. It carries a SIL 3 rating per IEC 61508 and IEC 62061, and PL e per ISO 13849-1, with a safe failure fraction of 99%. This means it is certified for use in safety functions up to the highest performance level for non-servo, electromechanical guarding applications — emergency stop circuits, light curtain monitoring, and two-hand control stations. The 22.5 mm width and screw-and-snap-on mounting mean it fits a standard DIN-rail enclosure without crowding adjacent devices. The push-in spring terminals accept solid wire 1x (20…16 AWG) or 2x (20…16 AWG), and stranded wire with or without ferrules up to 1.5 mm². That is a typical control-panel wiring range — no special crimp tools needed for the push-in termination. The relay includes a start input and a feedback input, plus two instantaneous contacts and two delayed-switching contacts (the delayed switching is rated at 2). The minimum sensor input pulse is 60 ms, and the maximum response time is 85 ms at DC. That 85 ms window is the time from sensor activation to output state change — fast enough for most machine-guarding circuits, but verify it against your safety PLC scan cycle if you are coordinating multiple devices. The 10g / 11 ms shock resistance covers vibration from contactors and motor starters in the same cabinet. ## Integration into a safety circuit The cascading design (yes) allows multiple 3SK1 relays to be linked for expanded safety zones without additional logic modules. The EMC emitted interference is Class A per IEC 60947-5-1, which is standard for industrial environments — not for residential or light-commercial without additional filtering. Maximum operating frequency is 2000 cycles per hour, adequate for most machine-cycle applications but not for high-speed press or stamping lines running above that rate.","metaTitle":"Siemens 3SK1122-2CB44 SIRIUS Safety Relay, SIL 3/PL e, 24 VD","metaDescription":"Siemens 3SK1122-2CB44 SIRIUS safety relay with solid-state enabling circuits, SIL 3 (IEC 61508), PL e (ISO 13849-1), 24 VDC, push-in terminals, 22.5 mm wide. Current lifecycle stag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Safety Relays"],"specifications":{"Depth":"121.6 mm","Solid":"1x (20 ... 16), 2x (20 ... 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","Delayed Switching":"2","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 ... 1.0 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 %","Without Core End Processing":"1x (0.5 ... 1.5 mm²), 2x (0.5 ... 1.5 mm²)","Type Of Electrical Connection":"spring-loaded terminal (push-in)","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, antivalent sensors, 2-hand switches, time delay","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 / 1","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":"Yes","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","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":"1.5E-9 1/h","suitability for operation device connector 3ZY12":"Yes","PFDavg with low demand rate according to IEC 61508":"7E-6","for delayed release circuit according to IEC 61508":"SIL3","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","adjustable OFF-delay time after opening of the safety circuits":"5 ... 300","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/3SK1122-2CB44/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3SK1122-2CB44?","answer":"Pricing and availability are confirmed at quote time. Submit an RFQ against the 3SK1122-2CB44 order code; the quote will reflect current landed cost and lead time through independent distribution."},{"question":"What compliance documentation does Siemens provide for 3SK1122-2CB44?","answer":"The relay carries SIL 3 certification per IEC 61508 and IEC 62061, and PL e per ISO 13849-1. EMC compliance is to IEC 60947-5-1 Class A. Standard Siemens declarations for RoHS and REACH are available on request."},{"question":"What is the depth of the 3SK1122-2CB44?","answer":"The depth is 121.6 mm. Combined with the 22.5 mm width and 100 mm height, the relay occupies a compact DIN-rail footprint."},{"question":"What wire sizes does the push-in terminal accept?","answer":"Solid wire: 1x (20…16 AWG) or 2x (20…16 AWG). Stranded with ferrule: 1x (0.5…1.0 mm²) or 2x (0.5…1.0 mm²). Stranded without ferrule: 1x (0.5…1.5 mm²) or 2x (0.5…1.5 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK1122-2CB44","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/3SK1122-2CB44 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}}