{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK2942-2AA11","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK2942-2AA11","canonicalUrl":"https://aoctrl.com/siemens/3SK2942-2AA11","factsUrl":"https://aoctrl.com/api/mcp/products/3SK2942-2AA11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS Safety Relay, PROFINET starter kit, 3SK2942-2AA11, 7 A total current, IP20, snap-on DIN rail.","salesMarkdown":"The Siemens 3SK2942-2AA11 is a SIRIUS safety relay delivered as a PROFINET starter kit. It comprises the 3SK2122-2AA10 basic unit, the 3SK2511-2FA10 PROFINET interface module, the SIRIUS Safety Professional TIA configuration software, and all required cables — everything needed to commission a safety application on PROFINET out of one box. The total current maximum of 7 A governs the load side — this is the aggregate current through the safety outputs, not per-channel. For a typical guard-door or two-hand control circuit with contactors and indicator loads, 7 A covers most single-zone safety cells. The 2 non-safety-related auxiliary contacts handle status feedback to a PLC without eating into the safety-rated current budget. Snap-mounted to DIN rail, or screw-mounted with an additional push-in lug. The 45 mm width and 124.5 mm depth mean it occupies a standard 45 mm slot on the rail — same footprint as a slimline contactor or a 4-pole relay base. IP20 on the enclosure and the terminal — finger-safe, not washdown. This is a panel-inside component; it needs an enclosure rated for the environment. Input delay time adjustable from 0 to 150 ms. This is the debounce or filter window for the safety input signals — set it short (0 ms) for fast-reacting light curtains, longer for mechanical interlock switches that bounce on closure. The readback time maximum of 400 ms governs how quickly the safety relay detects a feedback-loop fault from the downstream contactors. Valve monitoring is built in — the relay checks the state of a downstream valve (typically a pneumatic safety valve) before allowing the safety outputs to enable. Monitored start-up means the relay verifies that all inputs and feedback loops are in their safe state before it will start; this is standard for category 3 / PL d safety circuits. ## Fieldbus and communication PROFINET IO protocol is supported when using the included PN interface module, with 64-bit cyclic data. PROFIBUS DP is also an option with the DP interface module, also 64-bit cyclic. The starter kit ships with the PROFINET variant, so if your line runs PROFIBUS you need the DP interface module separately.","metaTitle":"Siemens 3SK2942-2AA11 SIRIUS Safety Relay Starter Kit, PROFI","metaDescription":"Siemens 3SK2942-2AA11 SIRIUS safety relay starter kit with PROFINET interface. 7 A total current, IP20 enclosure. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Safety Relays"],"specifications":{"Depth":"124.5 mm","Solid":"20 ... 16","Width":"45 mm","Height":"100 mm","Maximum":"0.1 mA","at 24 V":"1 ms","Stranded":"20 ... 16","2-Channel":"0","During Storage":"-40 ... +80 °C","Safety-Related":"20","Single Channel":"0","Of The Terminal":"IP20","Type Of Voltage":"DC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Snap-mounted to DIN rail or screw-mounted with additional push-in lug","Input Delay Time":"0 ... 150 ms","Of The Enclosure":"IP20","Product Category":"Safety relay","Shielded Maximum":"1 000 m","Shock Resistance":"15g / 11 ms","Valve Monitoring":"Yes","Light Test Period":"3 ms","Mounting Position":"any","at DC rated value":"24 V","Monitored Start-Up":"Yes","Non-Safety-Related":"2","Product Brand Name":"SIRIUS","Unshielded Maximum":"600 m","Degree Of Pollution":"3","Product Designation":"PROFINET starter kit","protection class IP":"IP20","PROFIBUS DP protocol":"Yes; when using the DP interface module; 64 bit cyclical data","PROFINET IO protocol":"Yes; when using the PN interface module; 64-bit cyclic data","for AWG cables solid":"1x (20 ... 16), 2x (20 ... 16)","for signal <1> at DC":"15 ... 30","Design Of The Product":"comprises 3SK2122-2AA10 basic unit, PROFINET 3SK2511-2FA10 interface module, SIRIUS Safety Professional TIA and required cables","Readback Time Maximum":"400 ms","Total Current Maximum":"7 A","with signal <0> at DC":"-3 ... +5 V","For Signal <1> Typical":"2.6 mA","Parameterizable Inputs":"Yes","according to IEC 61508":"3","according to IEC 62061":"3","EMERGENCY STOP function":"Yes","Parameterizable Outputs":"Yes","Safety-Related Circuits":"Yes","for AWG cables stranded":"1x (20 ... 16), 2x (20 ... 16)","Safety-Related 2-Channel":"4","Muting, 2 Sensor-Parallel":"Yes","Muting, 4 Sensor-Parallel":"Yes","Monitoring Parameterizable":"Yes","Position Switch Monitoring":"Yes","Protective Door Monitoring":"Yes","Evaluation: Enabling Switch":"Yes","Evaluation: Selector Switch":"Yes","Muting, 4 Sensor-Sequential":"Yes","Operating Frequency Maximum":"2 000 1/h","Operating Power Rated Value":"4.5 W","Proximity Switch Monitoring":"Yes","Substance Prohibitance (Date)":"07/01/2006","Type Of Electrical Connection":"spring-loaded terminal (push-in)","Insulation Voltage Rated Value":"50 V","Monitoring Of Floating Sensors":"Yes","Configuration Software Required":"Yes; Safety ES V1.0 and higher","EMERGENCY-OFF circuit monitoring":"Yes","Dark Period Of The Common Drivers":"3 ms","For Testing Contact-Based Sensors":"4","Number Of Function Blocks Typical":"50","Pressure-Sensitive Mat Monitoring":"Yes","Recovery Time Of The Safe Outputs":"0 ms","Control Supply Voltage Rated Value":"24 V","Monitoring Of Non-Floating Sensors":"Yes","Relative Humidity During Operation":"10 ... 95 %","air pressure according to SN 31205":"90 ... 106 kPa","Evaluation: Two-Hand Operator Panel":"Yes","Product Function Removable Terminal":"Yes","Surge Voltage Resistance Rated Value":"800 V","category according to EN ISO 13849-1":"4","two-hand control according to EN 574":"Yes","stop category according to EN 60204-1":"0 / 1","Magnetically Operated Switch Monitoring":"Yes","Protective Door Monitoring With Tumbler":"Yes","due to burst according to IEC 61000-4-4":"2 kV (power ports) / 1 kV (signal ports)","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"1x (0.5 ... 1.0 mm²), 2x (0.5 ... 1.0 mm²)","At Digital Output With Signal <0> Maximum":"0.1 mA","Input Delay Time At Digital Input Maximum":"150 ms","Touch Protection Against Electrical Shock":"finger-safe","product function suitable for AS-i Power24V":"No","protocol is supported AS-Interface protocol":"No","Opto-Electronic Protection Device Monitoring":"Yes","product function diagnostics with CTT2 slave":"No","At The Digital Outputs Short-Circuit Protection":"Yes","hardware fault tolerance according to IEC 61508":"1","performance level (PL) according to ISO 13849-1":"e","type of digital inputs according to IEC 60947-1":"Type 1","vibration resistance according to IEC 60068-2-6":"5 ... 500 Hz: 0.75 mm","Ingress Aquisition Time At Digital Input Maximum":"60 ms","PFHD with high demand rate according to EN 62061":"1.2E-8 1/h","EMC emitted interference according to IEC 60947-1":"class A","SIL Claim Limit (subsystem) according to EN 62061":"3","Evaluation: Electro-Sensitive Protective Equipment":"Yes","PFDavg with low demand rate according to IEC 61508":"1.8E-5","electrostatic discharge according to IEC 61000-4-2":"4 kV contact discharge / 8 kV air discharge","Installation Altitude At Height Above Sea Level Maximum":"4 000 m; Derating, see Product Notification 109792701","protocol is supported ASIsafe (Safety at work) protocol":"No","Design Of The Contactless Switching Element Safety-Related":"P potential","Diagnostics Test Interval By Internal Test Function Maximum":"1 000 s","switching capacity current of semiconductor outputs at DC-13 at 24 V":"4 A","Connectable Conductor Cross-Section Finely Stranded With Core End Processing":"0.5 ... 1 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SK2942-2AA11/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SK2942-2AA11?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment."},{"question":"What is 3SK2942-2AA11's listed depth?","answer":"The depth is 124.5 mm. Combined with the 45 mm width and 100 mm height, it fits a standard 45 mm DIN-rail slot."},{"question":"What fieldbus protocols does the 3SK2942-2AA11 support?","answer":"PROFINET IO with 64-bit cyclic data when using the included PN interface module; PROFIBUS DP with 64-bit cyclic data when using the DP interface module (sold separately)."},{"question":"What compliance documentation is available for 3SK2942-2AA11?","answer":"The product carries IP20 enclosure and terminal protection, degree of pollution 3, and is part of the Siemens SIRIUS family. Standard Siemens declarations (CE, UKCA, RoHS, REACH) are available on request. The evidence does not list specific certificates; request the manufacturer's declaration of conformity with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK2942-2AA11","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/3SK2942-2AA11 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}}