{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SK2112-1AA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3SK2112-1AA10","canonicalUrl":"https://aoctrl.com/siemens/3SK2112-1AA10","factsUrl":"https://aoctrl.com/api/mcp/products/3SK2112-1AA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SK2112-1AA10 safety relay base unit, 10 F-DI, 2 F-DQ, 1 DQ, 24 V DC, IP20, 22.5 mm wide.","salesMarkdown":"The Siemens 3SK2112-1AA10 is a SIRIUS safety relay base unit — the core of a modular fail-safe control system. It carries 10 fail-safe digital inputs (F-DI), 2 fail-safe digital outputs (F-DQ), and 1 standard digital output (DQ), all running on 24 V DC. That means it handles the safety logic for a machine zone: e-stop circuits, light curtains, two-hand controls, and guard door monitoring, with the F-DQ driving the safety contactors that drop the power. The 22.5 mm width and snap-on DIN rail mounting (or screw-mount with the push-in lug) let it fit tight panels without eating up rail space. Mounting position is unrestricted, so it works in any orientation the cabinet layout demands. The input delay is adjustable from 0 to 150 ms. That's the debounce window for the safety inputs — set it short (0 ms) for fast light curtains, longer for mechanical switch contacts that bounce. The readback time on the outputs caps at 400 ms, which is the window the base unit waits for the external contactors to confirm they've opened. If the feedback doesn't arrive in time, the relay faults and holds the safe state. Valve monitoring is built in — the base unit checks the position of downstream safety valves, not just contactors. That matters on hydraulic or pneumatic guarding circuits where a stuck spool can defeat the safety function. The light test period is 3 ms, meaning the unit strobes the output test pulses fast enough to detect a welded contactor without dropping the load. The IP20 enclosure and terminal protection mean it's not for wet environments, but it's fine inside a clean, dry cabinet. Shock resistance at 15g / 11 ms means it survives the vibration and shock of a machine cycling hard. The shielded sensor cable can run up to 1000 m, unshielded 600 m — that's plenty for most plant layouts, but if you're running sensor lines across a building, keep the shield grounded at the panel end only. Terminals accept solid or stranded wire from 20 to 14 AWG (1x 20-14, 2x 18-16 for solid). The spring-cage clamping holds the wire without screw tightening — strip to the right length, push in, done. The 124.5 mm depth is standard for the SIRIUS safety relay family, so it aligns with adjacent modules on the DIN rail. The base unit can be expanded with PROFIBUS DP or PROFINET IO interface modules for 64-bit cyclic data exchange with a safety PLC. That gives you diagnostics and parameterization over the fieldbus — useful for a line that needs remote fault logging or speed changes to the safety configuration. Total current draw is capped at 6.5 A across all outputs. That's the package limit, not per-channel — if you're driving multiple contactors or solenoid valves, sum the loads and stay under 6.5 A or add an external interposing relay.","metaTitle":"Siemens 3SK2112-1AA10 SIRIUS Safety Relay, 10 F-DI 2 F-DQ","metaDescription":"Siemens 3SK2112-1AA10 SIRIUS safety relay base unit, 10 fail-safe digital inputs, 2 fail-safe digital outputs, 1 standard DQ. IP20, 22.5 mm wide. Current lifecycle. Sourced to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Safety Relays"],"specifications":{"Depth":"124.5 mm","Solid":"20 ... 14","Width":"22.5 mm","Height":"100 mm","Maximum":"0.1 mA","at 24 V":"1 ms","Stranded":"20 ... 14","2-Channel":"0","During Storage":"-40 ... +80 °C","Safety-Related":"10","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":"1","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 ... 14), 2x (18 ... 16)","for signal <1> at DC":"15 ... 30","Design Of The Product":"10 F-DI, 2 F-DQ, 1 DQ","Readback Time Maximum":"400 ms","Total Current Maximum":"6.5 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 ... 14), 2x (18 ... 16)","Safety-Related 2-Channel":"2","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":"2.5 W","Proximity Switch Monitoring":"Yes","Substance Prohibitance (Date)":"05/28/2009","Type Of Electrical Connection":"screw-type terminals","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":"2","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 ... 2.5 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":"1E-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":"1.5E-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 ... 2.5 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SK2112-1AA10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SK2112-1AA10 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote and we'll confirm availability and current pricing at that time."},{"question":"What are the key specifications of 3SK2112-1AA10?","answer":"It's a SIRIUS safety relay base unit with 10 fail-safe digital inputs, 2 fail-safe digital outputs, and 1 standard DQ, operating on 24 V DC. It measures 22.5 mm wide, 100 mm high, 124.5 mm deep, and mounts on DIN rail or with screws. Input delay is adjustable 0–150 ms, readback time max 400 ms, total output current max 6.5 A."},{"question":"Does 3SK2112-1AA10 support PROFINET or PROFIBUS?","answer":"Yes, when used with the respective interface module, the base unit supports PROFINET IO and PROFIBUS DP with 64-bit cyclic data exchange."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SK2112-1AA10","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/3SK2112-1AA10 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}}