{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK2122-2AA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK2122-2AA10","canonicalUrl":"https://aoctrl.com/siemens/3SK2122-2AA10","factsUrl":"https://aoctrl.com/api/mcp/products/3SK2122-2AA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SK2122-2AA10 safety relay base unit, 20 F-DI, 4 F-DQ, 2 DQ, snap-on DIN rail, 45 x 100 x 124.5 mm, IP20.","salesMarkdown":"The Siemens 3SK2122-2AA10 is a SIRIUS safety relay base unit — the control backbone for a fail-safe I/O block on a machine safety circuit. This is the piece that sits between your safety-rated sensors (light curtains, e-stops, interlock switches) and the contactors or motor starters that drop power. The 20 F-DI count means it can handle a decent-sized guarding zone without needing a second node. At 45 mm wide and 124.5 mm deep, it fits a standard DIN-rail footprint — plan for about 4.5 cm of rail per unit. The IP20 enclosure means it belongs inside a panel, not out on the machine frame where washdown or dust would get to it. Input delay is adjustable from 0 to 150 ms, which lets you tune out nuisance trips from vibration or brief sensor shadows without slowing the safety reaction below what the risk assessment demands. Monitored start-up and valve monitoring are built in — the unit checks that the start button circuit and any downstream valve feedback are healthy before it lets the outputs energize. That's a standard feature on SIRIUS safety relays, but worth confirming if your BOM was carrying a separate monitoring module. It supports PROFIBUS DP and PROFINET IO when paired with the respective interface module, passing 64 bits of cyclic data. That lets the safety I/O talk to the standard PLC without a separate safety controller, as long as the CPU handles PROFIsafe.","metaTitle":"Siemens 3SK2122-2AA10 SIRIUS Safety Relay, 20 F-DI, 4 F-DQ","metaDescription":"Siemens 3SK2122-2AA10 SIRIUS safety relay base unit. 20 fail-safe digital inputs, 4 F-DQ, 2 DQ. Snap-on DIN rail. 45 mm wide, 124.5 mm deep. Sourced to order.","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":"Base-Unit","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":"20 F-DI, 4 F-DQ, 2 DQ","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)":"05/28/2009","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/3SK2122-2AA10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SK2122-2AA10 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"What is the depth of 3SK2122-2AA10?","answer":"The depth is 124.5 mm."},{"question":"What wire sizes does 3SK2122-2AA10 accept?","answer":"Solid and stranded wire from 20 AWG to 16 AWG (1x or 2x conductors)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK2122-2AA10","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/3SK2122-2AA10 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}}