{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK1122-2CB41","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK1122-2CB41","canonicalUrl":"https://aoctrl.com/siemens/3SK1122-2CB41","factsUrl":"https://aoctrl.com/api/mcp/products/3SK1122-2CB41","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS safety relay, 3SK1122-2CB41, 24 VDC, solid-state enabling circuits, spring-loaded push-in terminals, SIL 3 / PL e.","salesMarkdown":"The Siemens 3SK1122-2CB41 is a SIRIUS safety relay with solid-state enabling circuits, designed for safety-related applications where you need reliable monitoring of emergency stops, safety gates, and light curtains. It's rated for 24 VDC supply and carries SIL 3 per IEC 61508 and PL e per ISO 13849-1 — that's the top performance level for most machinery safety circuits. The safe failure fraction sits at 99%, meaning the relay can detect nearly every internal fault that could compromise safety. It can mount in any orientation, which helps when you're squeezing it into a crowded enclosure. The push-in terminals accept solid wire from 20 AWG to 16 AWG (single or doubled up) and stranded wire the same range. If you're using ferruled ends, the range drops to 0.5 to 1.0 mm². Strip length and ferrule size matter with spring clamps — use the recommended core-end processing to avoid terminal damage. Depth of 121.6 mm means it'll stick out a bit from the rail — check your enclosure depth if you're using shallow boxes. Height of 100 mm and width of 22.5 mm keep the footprint manageable. The degree of pollution 3 rating means it's suitable for industrial atmospheres with conductive or dry non-conductive pollution — typical for control cabinets near machining or assembly areas. Power loss maxes out at 2 W, so heat buildup in a dense row of relays is manageable. Shock resistance is 10g for 11 ms, which covers most vibration scenarios in industrial equipment. EMC emitted interference meets IEC 60947-5-1, Class A — that's the industrial limit. In residential or light commercial zones you might need additional filtering or shielding, but in a factory it's fine as-is. ## Safety logic and timing The relay has two instantaneous safety contacts and two delayed switching contacts. Start input and feedback input are both present, so you can wire up external start buttons and monitor contactors or valves downstream. The cascading design lets you link multiple 3SK1 relays for expanded safety zones without extra logic modules. Sensor input minimum off-time is 60 ms — important when you're using light curtains or two-hand controls that need a defined off-before-on sequence. Maximum response time is 85 ms, and the typical off-delay is 6500 ms (6.5 seconds), which is the time the safety outputs stay on after the input signal drops. Operating frequency maxes at 2000 cycles per hour, so it's not for high-speed cycling but fine for normal machine guarding.","metaTitle":"Siemens 3SK1122-2CB41 SIRIUS Safety Relay, 24 VDC, SIL 3/PL","metaDescription":"Siemens 3SK1122-2CB41 SIRIUS safety relay with solid-state enabling circuits. 24 VDC rated, SIL 3 (IEC 61508) and PL e (ISO 13849-1). Spring-loaded push-in terminals. Active produc","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":"0.05 ... 3","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/3SK1122-2CB41/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes fit the spring-loaded terminals on this relay?","answer":"The push-in terminals accept solid wire 1x or 2x (20 to 16 AWG) and stranded wire the same. With ferruled ends, the range is 1x or 2x (0.5 to 1.0 mm²). Without ferrules, stranded goes up to 1.5 mm² single or 1.0 mm² doubled."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK1122-2CB41","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/3SK1122-2CB41 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}}