{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF1234-1LC05-1BA1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF1234-1LC05-1BA1","canonicalUrl":"https://aoctrl.com/siemens/3SF1234-1LC05-1BA1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF1234-1LC05-1BA1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS mechanical safety switch, 3SF1234-1LC05-1BA1, block narrow plastic housing, 24 V LED, IP65, M12 plug, 2 NC safety contacts, positive opening, ASIsafe.","salesMarkdown":"The Siemens SIRIUS 3SF1234-1LC05-1BA1 is a mechanical safety switch with positive opening contacts — the kind you wire into a guard-door circuit so that when the door opens, the NC contacts physically break before the actuator reaches the safe position. Two safety-related NC contacts give you a redundant pair for SIL/PL-rated stop circuits; no NO auxiliary contacts on this variant. The 24 V LED gives a quick visual on the AS-Interface bus power without needing a multimeter. Mounts in any position via screw fixing. The block narrow plastic housing is 31 mm wide — fits a standard 30 mm cutout or DIN-rail adapter plate. IP65 means it handles washdown spray; fine for food or packaging lines where you hose down the guard enclosure. The M12 plug carries AS-Interface and ASIsafe on pins 1 and 3; pin 2 and 4 are unused, so a standard 4-pin M12 cordset works but you only need a 2-wire ASi cable if you're running the bus separately. Surge voltage resistance is 0.8 kV, so it's not for direct mains switching but fine for the 24 V control circuit it's designed for. Mechanical life is 15 million cycles typical — that's a lot of guard-door openings before the spring wears out. Repeat accuracy of 0.1 mm matters when the actuator position needs to be consistent cycle to cycle.","metaTitle":"Siemens 3SF1234-1LC05-1BA1 SIRIUS Safety Switch, 24 V LED, I","metaDescription":"Siemens SIRIUS 3SF1234-1LC05-1BA1 mechanical safety switch with 24 V LED, IP65, positive opening contacts, ASIsafe interface. Current lifecycle stage. Sourced 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":"31 mm","protection class IP":"IP65","Length Of The Sensor":"89.7 mm","Design Of The Housing":"block, narrow","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":"3SF1234-1LC05-1BA1","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":"Yes","Number Of Switching Contacts Safety-Related":"2","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","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/3SF1234-1LC05-1BA1/alternatives.json"},"ai":{"faq":[{"question":"What is the LED supply voltage for this switch?","answer":"The of LED is rated at 24 V. This powers the status indicator on the AS-Interface bus connection."},{"question":"What is the ID1 code on this AS-Interface safety switch?","answer":"The ID1 code is F in hex, variable 0...F. This sets the slave address on the AS-Interface bus."},{"question":"Where can I buy 3SF1234-1LC05-1BA1 and how is it quoted?","answer":"This part is sourced to order against an RFQ through independent industrial automation distribution. Availability and current pricing are confirmed at the time of quotation — submit an RFQ for a firm price and lead time."},{"question":"Does 3SF1234-1LC05-1BA1 have positive opening contacts?","answer":"Yes, the switching function is designed as positive opening. The NC contacts mechanically force open even if they weld, which is the requirement for safety guard-door switches per IEC 60947-5-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF1234-1LC05-1BA1","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/3SF1234-1LC05-1BA1 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}}