{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK3122-2AC00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK3122-2AC00","canonicalUrl":"https://aoctrl.com/siemens/3RK3122-2AC00","factsUrl":"https://aoctrl.com/api/mcp/products/3RK3122-2AC00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS Modular Safety System, central unit, 2/4 F-DI, 4 DI, 1 F-RO, 1 F-DO, SIL CL 3 per IEC 61508, IP20, 45 x 111 x 124 mm (W x H x D), snap-on DIN rail or screw mount.","salesMarkdown":"The Siemens 3RK3122-2AC00 is a SIRIUS Modular Safety System central unit — the brain of a distributed safety island. It packs 2 fail-safe digital inputs (configurable as 2- or 4-channel), 4 standard digital inputs, 1 fail-safe relay output, and 1 fail-safe digital output into a 45 mm wide DIN-rail housing. That means you can wire emergency stops, light curtains, and valve monitoring (yes, it does valve monitoring) into one module and get SIL CL 3 per IEC 61508 out of it — enough for most Category 3 or 4 safety circuits up to PL e. Rated for SIL CL 3 (IEC 61508) and SIL 3 (IEC 62061), it handles both 1-channel and 2-channel safety inputs. The 2-channel inputs are the ones that matter for redundancy — single-channel is there for simpler guarding where a single break is acceptable. You can set the input delay from 0 to 150 ms to filter out contact bounce on mechanical switches. ## Where it lives in the panel Mount it vertical on a DIN rail (snap-on) or screw it down with the optional push-in lug — your choice. It's IP20 on the enclosure and terminals, so it's strictly inside a cabinet; no washdown ratings here. At 45 mm wide and 124 mm deep, it leaves room for expansion modules alongside on the same rail. The spring-cage terminals accept 2 x 24–16 AWG solid or stranded, so you can daisy-chain safety loops without extra terminal blocks. Storage and transport go from -40 to +85 °C, so it survives a cold truck ride. Shock resistance is 15g / 11 ms, which handles the vibration you'd see on a machine-mounted panel. SIL CL 3 (IEC 61508) means this module can be used in safety functions up to SIL 3, which covers the vast majority of industrial guarding applications — press brakes, robotic cells, conveyor zones. The 2-channel input structure lets you wire dual-channel emergency stops or interlock switches with cross-fault detection. The fail-safe relay output (F-RO) switches safety loads directly; the fail-safe digital output (F-DO) can drive a contactor or a pilot light. Both are parameterizable via the engineering software — you can set the output behavior on fault, the startup test (monitored start-up is supported), and the input debounce time. The PROFIBUS DP interface (when used with the DP interface module) handles 64 bits of cyclical data — enough to map all the I/O points and diagnostics into a PLC without straining the bus cycle time. The module itself doesn't have a built-in fieldbus port; you add the interface module alongside on the DIN rail.","metaTitle":"Siemens 3RK3122-2AC00 SIRIUS Modular Safety System, SIL CL 3","metaDescription":"Siemens 3RK3122-2AC00 SIRIUS central unit: 2/4 F-DI, 4 DI, 1 F-RO, 1 F-DO, SIL CL 3 per IEC 61508, IP20, DIN-rail mount. Sourced to order — request quote.","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":"3RK3122-2AC00","Height":"111 mm","at 24 V":"1 ms","Stranded":"24 ... 16","2-Channel":"1","description":"SIRIUS, Central unit 3RK3 ASIsafe Extended for modular Safety system 3RK3 2/4 F-DI, 4 DI, 1 F-RO, 1 F-DO,24 V DC Monitoring of ASI slaves Control of 10 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) 2 extension modules connectable","During Storage":"-40 ... +85 °C","Safety-Related":"4","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","protection class IP":"IP20","PROFIBUS DP protocol":"Yes; when using the DP interface module; 64 bit cyclical data","for AWG cables solid":"2x (24 ... 16)","Design Of The Product":"2/4 F-DI, 4 DI, 1 F-RO, 1 F-DO","Parameterizable Inputs":"Yes","according to IEC 61508":"SIL CL 3","according to IEC 62061":"3","EMERGENCY STOP function":"Yes","Parameterizable Outputs":"Yes","Safety-Related Circuits":"Yes","for AWG cables stranded":"2x (24 ... 16)","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":"10","Pulse Duration Of The Contactless Semiconductor Contact Block For Switching Off Safety-Related Maximum":"1 ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fac83c9da1b7152a3fc11d21084699cd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=152976&mlfb=3RK3122-2AC00"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RK3122-2AC00?","answer":"Submit an RFQ through this listing. We source the part through independent distribution and will confirm current pricing and availability at quote time."},{"question":"What safety level does 3RK3122-2AC00 support?","answer":"It is rated SIL CL 3 per IEC 61508 and SIL 3 per IEC 62061. That covers Category 3 and 4 safety circuits up to PL e under EN ISO 13849-1."},{"question":"What documentation does Siemens provide for this module?","answer":"Siemens provides a product manual, system manual, and safety-related documentation covering SIL CL 3 compliance. The module carries CE, UKCA, and EAC markings for European and Eurasian markets. UL and CSA listings are available on the product certificate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK3122-2AC00","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/3RK3122-2AC00 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}}