{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK1122-1CB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK1122-1CB44","canonicalUrl":"https://aoctrl.com/siemens/3SK1122-1CB44","factsUrl":"https://aoctrl.com/api/mcp/products/3SK1122-1CB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SK1122-1CB44 safety relay, 24 V DC, SIL 3 / PL e, 22.5 mm wide, screw terminals, snap-on mounting.","salesMarkdown":"## SIRIUS 3SK1122-1CB44 — Safety Relay for Guarding Circuits The Siemens 3SK1122-1CB44 is a SIRIUS safety relay with solid-state enabling circuits, rated for 24 V DC supply. It carries SIL 3 per IEC 61508 and IEC 62061, and PL e per ISO 13849-1, with a safe failure fraction of 99% — the highest integrity tier for machine guarding and safety shutdown paths. The 22.5 mm width and screw-and-snap-on mounting mean it fits a standard DIN-rail enclosure without extra bracketing. Depth is 121.6 mm, height 100 mm — check clearance against the cabinet door or adjacent busbars. SIL 3 / PL e means this relay is designed for safety functions up to the highest performance level in ISO 13849-1 — suitable for Category 4 architectures with redundant channels and cross-monitoring. The 99% SFF indicates that over 99% of dangerous failures are detected by diagnostics, a requirement for SIL 3 subsystems. The 24 V DC supply is the control voltage; the relay also accepts a start input and a feedback input, which are typical for monitored start/restart and external contactor feedback in a safety circuit. Two instantaneous contacts and two delayed switching contacts (60 ms minimum sensor input) give flexibility for both immediate and timed shutdown paths. Screw-type terminals accept 1x (20–14 AWG) solid or 1x (0.5–2.5 mm²) with ferrule. Mounts in any position via the DIN-rail snap-on or screw fixing. Shock resistance is 10 g for 11 ms — suitable for panel mounting on machinery subject to vibration. Cascading is supported (design of cascading: yes), so multiple 3SK1122 units can be linked for expanded zone control without additional safety logic modules.","metaTitle":"Siemens 3SK1122-1CB44 SIRIUS Safety Relay, SIL 3 / PL e, 24","metaDescription":"Siemens 3SK1122-1CB44 SIRIUS safety relay, 24 V DC, SIL 3 (IEC 61508), PL e (ISO 13849-1), SFF 99%. 22.5 mm wide, DIN-rail mount. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Safety Relays"],"specifications":{"Depth":"121.6 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","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 ... 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, 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/3SK1122-1CB44/alternatives.json"},"ai":{"faq":[{"question":"Does 3SK1122-1CB44 support cascading?","answer":"Yes, the design of cascading is enabled, allowing multiple units to be linked for expanded safety zone control."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK1122-1CB44","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/3SK1122-1CB44 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}}