{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF3257-6XX40-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF3257-6XX40-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3SF3257-6XX40-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3SF3257-6XX40-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3SF3257-6XX40-0BA2, communication-capable position switch, mechanical, IP65, block housing EN 50047, AS-i insulation displacement, 1 NC, positive opening.","salesMarkdown":"The Siemens 3SF3257-6XX40-0BA2 is a communication-capable position switch — a mechanical limit switch with an integrated AS-i (Actuator-Sensor Interface) adapter, so it reports its state directly onto the AS-i bus without a separate I/O block. The housing follows the EN 50047 block form factor, screw-fixed, molded-plastic, rated IP65 for washdown or dusty environments. It carries one NC contact with positive opening operation, meaning the NC is mechanically forced open when the actuator is tripped — that's the safety-relevant feature that makes it suitable for guard-door monitoring or position confirmation on a machine where a stuck-welded contact can't be tolerated. ## AS-i connection and wiring reality Connection is via AS-i insulation displacement method — the flat cable pierces into the AS-i ribbon, no separate M12 cordset needed for the bus. The actuator is separate (not integrated into the switch body), so you mount the switch body on the frame and the actuator on the guard or moving part. The switch uses a separate actuator design, so verify the actuating travel matches your door or slide geometry before panel assembly.","metaTitle":"Siemens 3SF3257-6XX40-0BA2 AS-i Position Switch, IP65, 1NC","metaDescription":"Siemens 3SF3257-6XX40-0BA2 communication-capable position switch with AS-i adapter. IP65, positive opening 1NC, screw fixing, EN 50047 block housing. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Safety Interlock Switches"],"specifications":{"lifecycle_stage":"current","Active Principle":"mechanical","Fastening Method":"screw fixing","Product Designation":"communication-capable position switch","protection class IP":"IP65","Design Of The Housing":"block, EN 50047","Material Of The Enclosure":"molded-plastic","Type Of Electrical Connection":"AS-i insulation displacement method","Design Of The Actuating Element":"separate actuator","Design Of The Switching Function":"positive opening","Product Function Positive Opening":"Yes","Ambient Temperature During Operation":"-25 ... +60 °C","reference code according to IEC 81346-2":"B","Design Of The Housing According To Standard":"Yes","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SF3257-6XX40-0BA2/alternatives.json"},"ai":{"faq":[{"question":"What does positive opening mean on this switch?","answer":"Positive opening means the NC contact is mechanically forced open when the actuator is operated, regardless of whether the contacts have welded. This is a safety feature required for guard-door monitoring per IEC 60947-5-1."},{"question":"How is this switch connected to the AS-i network?","answer":"It uses AS-i insulation displacement connection — the flat AS-i cable pierces directly into the switch body, eliminating the need for a separate bus tap or M12 cordset."},{"question":"Where can I buy 3SF3257-6XX40-0BA2 and how is it quoted?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF3257-6XX40-0BA2","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/3SF3257-6XX40-0BA2 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}}