{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK1111-2AW20","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK1111-2AW20","canonicalUrl":"https://aoctrl.com/siemens/3SK1111-2AW20","factsUrl":"https://aoctrl.com/api/mcp/products/3SK1111-2AW20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SK1111-2AW20 safety relay, SIL 3 (IEC 61508, IEC 62061), rated 110-240 V AC/DC, 22.5 mm width, screw and snap-on mounting.","salesMarkdown":"## Safety relay for enabling circuits — SIL 3 rated That SIL 3 rating means it meets the highest single-device safety integrity level for machinery guarding — suitable for applications where a single fault cannot lead to loss of the safety function, such as emergency stop circuits, light curtain monitoring, and two-hand control stations. Rated 110-240 V AC/DC with an operating range of 0.85 to 1.1 times rated voltage at both 50 Hz and 60 Hz. Response time is 200 ms typical, 300 ms maximum; AC and DC dropout both cap at 130 ms maximum. That 200 ms window is fast enough for most machine-guarding circuits but not for high-speed press applications that demand sub-50 ms reaction — those need a dedicated safety controller. ## Mounting and wiring — 22.5 mm DIN-rail footprint Width is 22.5 mm, height 100 mm, depth 121.6 mm — the standard single-module footprint that snaps onto a DIN rail (screw and snap-on mounting) and fits any position. Terminals accept solid wire 1x (20-16 AWG) or 2x (20-16 AWG), and stranded wire the same. With ferrules, capacity is 1x (0.5-1.0 mm²) or 2x (0.5-1.0 mm²). The spring-cage or screw terminals (fastening method is screw and snap-on) handle the typical 0.75 mm² control wiring used in safety circuits. ## Functional inputs and ratings Includes a start input and a feedback input, so it supports monitored start (automatic or manual) and external contactor feedback for cross-monitoring of the power contacts downstream. The safety switch input is present, meaning it can directly read a guard door switch without an intermediate interface. Total current maximum through the enabling circuits is 12 A. At 24 V the relay contacts are rated 1 A, at 115 V and 230 V they are rated 1.5 A — these are the thermal current limits for the safety contacts, not motor-starting ratings. Power loss is 2.5 W maximum, negligible for panel thermal budgeting. Shock resistance is 10 g / 11 ms. EMC emitted interference meets IEC 60947-5-1, Class A (industrial environment).","metaTitle":"Siemens 3SK1111-2AW20 SIRIUS Safety Relay, SIL 3, 110-240V","metaDescription":"Siemens 3SK1111-2AW20 SIRIUS safety relay, SIL 3 per IEC 61508/62061, rated 110-240 V AC/DC, 22.5 mm wide. Active production. Quoted 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 ... 16), 2x (20 ... 16)","Width":"22.5 mm","at DC":"0.85 ... 1.1","Height":"100 mm","Maximum":"300 ms","Typical":"200 ms","at 24 V":"1 A","Stranded":"1x (20 ... 16), 2x (20 ... 16)","at 115 V":"1.5 A","at 230 V":"1.5 A","at 50 Hz":"0.85 ... 1.1","at 60 Hz":"0.85 ... 1.1","Rated Value":"110 ... 240 V","Start Input":"Yes","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","Safety Switch":"Yes","at AC maximum":"130 ms","at DC maximum":"130 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":"Relay enabling circuits","Total Current Maximum":"12 A","according to IEC 61508":"3","according to IEC 62061":"3","power loss [W] maximum":"2.5 W","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":"150 ms","Operating Frequency Maximum":"360 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":"300 V","Monitoring Of Floating Sensors":"Yes","Product Function Parameterizable":"Sensor floating / monitored start / automatic start","Safety-Related Delayed Switching":"0","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":"0.015 s","Product Feature Cross-Circuit-Proof":"Yes","operational current at 17 V minimum":"5 mA","Cascading Input/Functional Switching":"No","Safety-Related Instantaneous Contact":"3","Surge Voltage Resistance Rated Value":"4 000 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":"No","reference code according to IEC 81346-2":"F","Recovery Time After Power Failure Typical":"0.32 s","Suitability For Interaction Press Control":"No","Touch Protection Against Electrical Shock":"finger-safe","safety device type according to IEC 61508-2":"Type A","For Signaling Function Instantaneous Contact":"1","Type Of Electrical Connection Plug-In Socket":"No","Type Of Voltage Of The Control Supply Voltage":"AC/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":"No","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","PFDavg with low demand rate according to IEC 61508":"1E-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":"10 ms","Thermal Current Of The Switching Element With Contacts Maximum":"5 A","Backslide Delay Time After Opening Of The Safety Circuits Typical":"10 ms","design of the fuse link for short circuit protection of the NC contacts of the relay outputs required":"Diazed or Neozed fuses, operating class gL/gG: 6 A or MCB type A: 2 A or MCB type B: 2 A or MCB type C: 1 A","design of the fuse link for short-circuit protection of the NO contacts of the relay outputs required":"gL/gG: 6A or circuit breaker type A: 3A or circuit breaker type B: 2A or circuit breaker type C: 1A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SK1111-2AW20/alternatives.json"},"ai":{"faq":[{"question":"What is the response time of 3SK1111-2AW20?","answer":"Typical response time is 200 ms; maximum is 300 ms. AC and DC dropout both have a maximum of 130 ms."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK1111-2AW20","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/3SK1111-2AW20 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}}