{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF1244-1LC05-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF1244-1LC05-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3SF1244-1LC05-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3SF1244-1LC05-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SF1244-1LC05-1BA2, mechanical safety switch with ASIsafe, M12 plug, 24 V LED, IP66/IP67, 0.1 mm repeat accuracy, positive opening contacts.","salesMarkdown":"The Siemens 3SF1244-1LC05-1BA2 is a SIRIUS mechanical safety switch with ASIsafe communication, built for guarding applications where a positively opening contact must break the safety circuit when the guard opens. It carries a 24 V LED for bus power indication and is rated IP66/IP67, so it handles washdown environments in food, beverage, or pharmaceutical lines without needing an external enclosure. Repeat accuracy of 0.1 mm means the switch detects the actuator position within a tenth of a millimeter every cycle — important for consistent safety distance calculations on hinged or sliding guards. The positive opening action is a mechanical guarantee per IEC 60947-5-1: even if contacts weld, the actuator force physically breaks them open. That's the feature that makes this a safety-rated device, not just a limit switch. The 24 V LED confirms AS-Interface bus power is present at the switch. Screw fixing, block-style housing, 50 mm wide. The M12 plug (4-pole, fixed) carries ASI+ on pin 1, ASI- on pin 3; pins 2 and 4 are unassigned. The ASIsafe channel 2 loops through to an M12 socket on the right side of the housing — that daisy-chain pass-through saves a tee connector when linking multiple safety switches on the same bus segment.","metaTitle":"Siemens 3SF1244-1LC05-1BA2 SIRIUS Safety Switch, IP66/IP67,","metaDescription":"Siemens 3SF1244-1LC05-1BA2 SIRIUS mechanical safety switch with ASIsafe interface, 24 V LED, IP66/IP67, 0.1 mm repeat accuracy. Current production. Quoted to order.","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":"snap-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/3SF1244-1LC05-1BA2/alternatives.json"},"ai":{"faq":[{"question":"What does the 24 V LED indicate on this switch?","answer":"The 24 V LED lights when AS-Interface bus power is present at the switch. If it's off, the bus master or the M12 cable connection should be checked first."},{"question":"What is the ID1 code on this AS-Interface safety switch?","answer":"The ID1 code is F (hex), variable 0...F, which identifies the device profile on the AS-Interface bus."},{"question":"Will 3SF1244-1LC05-1BA2 drop into a panel specified for a 3RT contactor?","answer":"No — the 3RT series are contactors, not safety switches. This part mounts with screw fixing and connects via M12 AS-Interface cabling, not the power terminals of a contactor. They serve different functions in the panel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF1244-1LC05-1BA2","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/3SF1244-1LC05-1BA2 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}}