{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF1234-1KC05-1BA1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF1234-1KC05-1BA1","canonicalUrl":"https://aoctrl.com/siemens/3SF1234-1KC05-1BA1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF1234-1KC05-1BA1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS mechanical safety switch, 3SF1234-1KC05-1BA1, 24 V LED, IP65, M12 plug ASIsafe, positive opening, 0.1 mm repeat accuracy.","salesMarkdown":"## What this safety switch does on the line The Siemens SIRIUS 3SF1234-1KC05-1BA1 is a mechanical safety switch built for guard-door and hazard-zone interlocking — the kind of part that stops a conveyor or press when a guard opens. It carries two safety-related NC contacts with positive opening, so when the actuator is forced out, those contacts are mechanically driven open — no spring reliance, no weld-stick failure. That's the feature that makes it suitable for safety circuits up to PL d / SIL 2 territory, per the design. The 24 V LED gives a quick visual on the line: lit means the switch is made, dark means the guard is open or the AS-Interface bus is down. IP65 sealing means it handles washdown splashes and dust on a packaging line or a conveyor transfer point — out here in the grease, that's what keeps a switch from dying from a hose-down. ## Mounting and wiring — what fits where The housing is a narrow plastic block, 31 mm wide, fixed by screw fixing in any mounting position. That narrow profile means it tucks into tight spots on machine frames where a wider switch won't fit. Connection is a fixed 4-pin M12 plug — pin 1 is ASI+, pin 3 is ASI-. The AS-Interface slave profile is 0.B.F, so it talks safety over the ASIsafe bus. No rewiring for a different connector; the M12 is the standard for field-mount safety devices. The cable comes pre-wired to the plug — just screw it onto the machine frame, plug in the M12 drop, and address it on the bus.","metaTitle":"Siemens SIRIUS 3SF1234-1KC05-1BA1 Safety Switch, 24 V LED, I","metaDescription":"Siemens SIRIUS 3SF1234-1KC05-1BA1 mechanical safety switch, 24 V LED, IP65, positive opening, 0.1 mm repeat accuracy. Current lifecycle. 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":"slow-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":"3SF1234-1KC05-1BA1","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 (Operating 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/3SF1234-1KC05-1BA1/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SF1234-1KC05-1BA1 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the repeat accuracy of 3SF1234-1KC05-1BA1?","answer":"The repeat accuracy is 0.1 mm — that's the positional repeatability of the actuation point, important for consistent guard-door detection."},{"question":"Does 3SF1234-1KC05-1BA1 have positive opening contacts?","answer":"Yes, the switching function is positive opening — the NC contacts are mechanically forced open when the actuator is released, which is required for safety circuits."},{"question":"Is 3SF1234-1KC05-1BA1 suitable for washdown environments?","answer":"Yes, the protection class is IP65 — dust-tight and protected against water jets, so it holds up on packaging lines or conveyor transfer points that get hosed down."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF1234-1KC05-1BA1","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/3SF1234-1KC05-1BA1 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}}