{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK3131-2AC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK3131-2AC10","canonicalUrl":"https://aoctrl.com/siemens/3RK3131-2AC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RK3131-2AC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS modular safety system central unit, 3RK3131-2AC10, 4/8 F-DI, 1 F-RO, 1 F-DO, SIL CL 3, PROFIBUS DP, IP20, snap-on DIN rail.","salesMarkdown":"## Safety-rated central unit for modular guarding The Siemens SIRIUS 3RK3131-2AC10 is a modular safety system central unit, configured as 4/8 fail-safe digital inputs, 1 fail-safe relay output, and 1 fail-safe digital output. Its SIL CL 3 rating per IEC 61508 means it is qualified for safety functions up to that integrity level — suitable for EMERGENCY STOP circuits and valve monitoring in a guarded zone. Snap-mounted onto a DIN rail or screw-mounted with an additional push-in lug, the unit sits inside a standard IP20 enclosure — typical for a control cabinet where the safety logic lives separate from the field I/O. Input delay is parameterizable from 0 to 150 ms, allowing the designer to filter out contact bounce on safety gates without adding external timers. ## PROFIBUS DP integration and data width When paired with the DP interface module, the central unit communicates over PROFIBUS DP with 64-bit cyclical data. This allows the safety CPU to read all input states and output commands in a single bus cycle, keeping the safety reaction time predictable. The unit supports parameterizable inputs and outputs, so the safety logic can be tuned per machine zone without firmware changes. Rated for operation from -20 to +60 °C and storage from -40 to +85 °C, with a shock resistance of 15g / 11 ms. Mounting position is vertical only — horizontal installation is not supported per the spec.","metaTitle":"Siemens 3RK3131-2AC10 SIRIUS Central Unit, SIL CL 3, 4/8 F-D","metaDescription":"Siemens 3RK3131-2AC10 SIRIUS modular safety system central unit. SIL CL 3 per IEC 61508, 4/8 F-DI, 1 F-RO, 1 F-DO. PROFIBUS DP. Current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Safety Relays"],"specifications":{"Depth":"124 mm","Solid":"24 ... 16","Width":"45 mm","title":"3RK3131-2AC10","Height":"113 mm","at 24 V":"1 ms","Stranded":"24 ... 16","2-Channel":"1","description":"SIRIUS, Central unit 3RK3 Advanced for modular Safety system 3RK3 4/8 F-DI,1F-RO,1 F-DO,24 V DC Monitoring of ASI slaves Control of 12 safe outputs on AS-Interface bus parameterizable using software Safety ES 45 mm overall width Spring-type terminal Up to SIL3 (IEC 61508) Up to Performance Level E (ISO 13849-1) 9 extension modules connectable","During Storage":"-40 ... +85 °C","Safety-Related":"8","Single Channel":"0","Of The Terminal":"IP20","Type Of Voltage":"DC","at 30 V maximum":"45 mA","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-40 ... +85 °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":"Modular Safety System","Shock Resistance":"15g / 11 ms","Valve Monitoring":"Yes","Mounting Position":"vertical","Monitored Start-Up":"Yes","Non-Safety-Related":"0","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Central unit","at AWG cables solid":"2x (24 ... 16)","protection class IP":"IP20","PROFIBUS DP protocol":"Yes; when using the DP interface module; 64 bit cyclical data","Design Of The Product":"4/8 F-DI, 1 F-RO, 1 F-DO","Parameterizable Inputs":"Yes","according to IEC 61508":"SIL CL 3","according to IEC 62061":"3","at AWG cables stranded":"2x (24 ... 16)","EMERGENCY STOP function":"Yes","Parameterizable Outputs":"Yes","Safety-Related Circuits":"Yes","Safety-Related 2-Channel":"1","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":"1 000 1/h","Operating Power Rated Value":"4.5 W","Proximity Switch Monitoring":"Yes","Substance Prohibitance (Date)":"05/28/2009","Type Of Electrical Connection":"spring-loaded terminals","Insulation Voltage Rated Value":"300 V","Monitoring Of Floating Sensors":"Yes","category according to EN 954-1":"4","EMERGENCY-OFF circuit monitoring":"Yes","Dark Period Of The Common Drivers":"1 ms","For Testing Contact-Based Sensors":"2","Number Of Function Blocks Typical":"300","Pressure-Sensitive Mat Monitoring":"Yes","Recovery Time Of The Safe Outputs":"420 ms","Control Supply Voltage Rated Value":"24 V","DC resistance of the cable maximum":"100 Ω","Monitoring Of Non-Floating Sensors":"Yes","air pressure according to SN 31205":"70 ... 106 kPa","at 24 V with AS-i Power24V maximum":"45 mA","Evaluation: Two-Hand Operator Panel":"Yes","Product Function Removable Terminal":"Yes","Surge Voltage Resistance Rated Value":"2 500 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","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.","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":"K","Finely Stranded With Core End Processing":"2x (0.25 ... 1 mm²)","Input Delay Time At Digital Input Maximum":"150 ms","Touch Protection Against Electrical Shock":"finger-safe","product function suitable for AS-i Power24V":"Yes","protocol is supported AS-Interface protocol":"Yes","Opto-Electronic Protection Device Monitoring":"Yes","product function diagnostics with CTT2 slave":"Yes","hardware fault tolerance according to IEC 61508":"1","performance level (PL) according to ISO 13849-1":"e","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":"7E-9 1/h","SIL Claim Limit (subsystem) according to EN 62061":"Kat. 4 / SIL3 / Ple","Consumed Current For Rated Value Of Supply Voltage":"1.685 A","Evaluation: Electro-Sensitive Protective Equipment":"Yes","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","electrostatic discharge according to IEC 61000-4-2":"4 kV contact discharge / 8 kV air discharge","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","protocol is supported ASIsafe (Safety at work) protocol":"Yes","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":"1.5 A","Connectable Conductor Cross-Section Finely Stranded With Core End Processing":"0.25 ... 1.5 mm²","number of safe signals for remote shutdown or cross traffic by means of AS-interface":"12","Pulse Duration Of The Contactless Semiconductor Contact Block For Switching Off Safety-Related Maximum":"1 ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$802.39","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5da34deeff9961fe6d4d84f3999970cf.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=3874&mlfb=3RK3131-2AC10"},"ai":{"faq":[{"question":"What is the depth of the 3RK3131-2AC10?","answer":"The depth is 124 mm, with a width of 45 mm and height of 113 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK3131-2AC10","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/3RK3131-2AC10 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:41:02.429Z","lastPublished":"2026-07-20T14:41:02.429Z","indexable":true}}