{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF1244-1KC05-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF1244-1KC05-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3SF1244-1KC05-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3SF1244-1KC05-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SF1244-1KC05-1BA2, mechanical safety switch, block design, plastic enclosure, 24 V LED, IP66/IP67, M12 plug-in, ASIsafe interface, positive opening contacts.","salesMarkdown":"## Safety switch with ASIsafe and positive opening — what ships in the box The Siemens 3SF1244-1KC05-1BA2 is a SIRIUS mechanical safety switch in a compact block-style plastic housing (50 mm wide, 60.7 mm long) with screw fixing and any-position mounting. It carries one safety-related switching contact with positive opening (the NC contacts physically force the contacts apart, even if welded) and two auxiliary NC contacts — zero NO auxiliary contacts on this variant. The 24 V LED signals the AS-Interface bus status, and the ID1 code is set to F (hex, variable 0…F) for slave addressing. Rated for IP66/IP67, the enclosure handles washdown environments — suitable for food-and-bev or wet-area guard doors. The M12 plug, 4-pole, fixed connection uses pin 1 for ASI+, pin 3 for ASI-; pins 2 and 4 are unassigned. ## ASIsafe loop-through and safety circuit integration Safety-related communication runs over ASIsafe via the M12 plug, with channel 2 looped through to an M12 socket on the right side of the housing. This daisy-chain design means you don't break the ASI bus when you unplug the switch — the loop-through keeps the downstream devices online. The slave profile is 0.B.F. Slow-action contacts (not snap-action) and mechanical active principle with 15 million typical mechanical switching cycles. Repeat accuracy is 0.1 mm.","metaTitle":"Siemens 3SF1244-1KC05-1BA2 SIRIUS Safety Switch, 24 V LED, I","metaDescription":"Siemens 3SF1244-1KC05-1BA2 SIRIUS mechanical safety switch with 24 V LED, positive opening contacts, IP66/IP67, ASIsafe interface. Current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Safety Interlock Switches"],"specifications":{"of LED":"24 V","ID1 code":"F (hex, variable 0...F)","During Storage":"-40 ... +80 °C","Repeat Accuracy":"0.1 mm","lifecycle_stage":"current","Active Principle":"mechanical","During Operation":"-25 ... +60 °C","Fastening Method":"screw fixing","Circuit Principle":"slow-action contacts","Mounting Position":"any","Product Brand Name":"SIRIUS","Degree Of Pollution":"class 3","Product Designation":"Mechanical safety switches","Width Of The Sensor":"50 mm","protection class IP":"IP66/IP67","Length Of The Sensor":"60.7 mm","Design Of The Housing":"block, wide","Material Of The Enclosure":"plastic","AS-Interface slave profile":"0.B.F","Design Of Plug-In Connection":"M12 plug, 4-pole: Pin 1 = ASI+ , Pin 2 = not assigned, Pin 3= ASI-, Pin 4 = not assigned","Of The Supplied Basic Switch":"3SF1244-1KC05-1BA2","Substance Prohibitance (Date)":"03/01/2017","Type Of Electrical Connection":"M12 plug, fixed, 4-pole","Insulation Voltage Rated Value":"30 V","Design Of The Actuating Element":"Other, without, ASi_basic switch with plug","Design Of The Switching Contact":"mechanical","Design Of The Switching Function":"positive opening","Product Function Positive Opening":"Yes","Suitability For Use Safety Switch":"Yes","Surge Voltage Resistance Rated Value":"0.8 kV","reference code according to IEC 81346-2":"B","Design Of The Housing According To Standard":"No","Number Of Switching Contacts Safety-Related":"1","number of NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"0","shock resistance according to IEC 60068-2-27":"30g / 11 ms","vibration resistance according to IEC 60068-2-6":"0.35 mm/5g","Mechanical Service Life (Switching Cycles) Typical":"15 000 000","Minimum Actuating Force In Directions Of Actuation":"20 N","Design Of The Interface For Safety-Related Communication":"ASIsafe via M12 plug, channel 2 looped through to M12 socket on the right","type of voltage of the supply voltage of the optional LED display":"DC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SF1244-1KC05-1BA2/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3SF1244-1KC05-1BA2?","answer":"Submit an RFQ against this order code. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What is the 24 V LED on this safety switch for?","answer":"The 24 V LED indicates AS-Interface bus status on the switch — it lights when the ASI bus voltage is present and the slave is communicating. The LED is powered from the ASI bus itself (24 V via pins 1 and 3 of the M12 connector)."},{"question":"What compliance documentation does Siemens provide for 3SF1244-1KC05-1BA2?","answer":"The part carries a substance prohibitance date of 03/01/2017, aligning with RoHS compliance. The reference code per IEC 81346-2 is B. For full declarations (REACH, UL, IEC), request the manufacturer's compliance package with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF1244-1KC05-1BA2","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/3SF1244-1KC05-1BA2 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}}