{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF5811-0AA08","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF5811-0AA08","canonicalUrl":"https://aoctrl.com/siemens/3SF5811-0AA08","factsUrl":"https://aoctrl.com/api/mcp/products/3SF5811-0AA08","rawCanonicalId":null},"summary":{"shortDescription":"Siemens AS-Interface emergency stop, 3SF5811-0AA08, IP65, 22 mm mounting diameter, positive opening, rotate-to-unlatch, F slave 2I.","salesMarkdown":"The Siemens 3SF5811-0AA08 is an AS-Interface emergency-stop slave with a red mushroom pushbutton actuator and a yellow plastic enclosure. It carries both EMERGENCY-STOP and EMERGENCY OFF functions, with positive opening contacts — meaning the NC contacts are mechanically forced open when the button is pressed, even if they've welded shut. That's the safety-relevant feature that lets this part sit in a Category 0 or Category 1 stop circuit per IEC 60204-1. It's an F slave with 2 inputs (2I), so it reports its state over the AS-i bus without needing a separate safety relay in the cabinet — the safety PLC or AS-i safety monitor handles the logic. The rotate-to-unlatch mechanism means you twist the mushroom head to reset it; no key required. The housing is designed for floor mounting (vertical orientation) and uses a standard 22 mm panel cutout — round hole, plastic enclosure front is square. The unit ships pre-wired on a strip terminal, so you're not crimping AS-i flat cable connectors in the field; just strip and terminate. Dimensions are 85 mm wide, 85 mm high, 64 mm deep — compact enough for a shallow enclosure lid or a small junction box. Substance prohibitance date of 05/28/2009 references the RoHS compliance cutoff — the part meets RoHS requirements as of that date. No separate UL or CSA listing appears in the spec record, but the AS-i compliance and positive-opening safety contacts are the governing standards for machine safety circuits. The DC rated voltage is 30 V — that's the AS-Interface bus voltage, not a separate control supply. The slave draws its power and communication from the AS-i yellow cable, so no additional 24 VDC wiring is needed. One AS-i slave address consumed per unit.","metaTitle":"Siemens 3SF5811-0AA08 AS-i Emergency Stop, IP65, 22mm","metaDescription":"Siemens 3SF5811-0AA08 AS-Interface emergency stop with positive opening, IP65, 22mm mounting, rotate-to-unlatch. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Safety Interlock Switches"],"specifications":{"Depth":"64 mm","Width":"85 mm","Height":"85 mm","During Storage":"-40 ... +80 °C","of AS-i slaves":"Floor mounting","lifecycle_stage":"current","During Operation":"-25 ... +70 °C","Number Of Labels":"0","Positive Opening":"Yes","Product Function":"EMERGENCY-STOP","Mounting Diameter":"22 mm","at DC rated value":"30 V","protection class IP":"IP65","Design Of The Housing":"AS-Interface enclosure with standard equipment","Number Of Lampholders":"0","number of AS-i slaves":"1","EMERGENCY OFF function":"Yes","Material Of The Holder":"Plastic","EMERGENCY STOP function":"Yes","Design Of The Slave Type":"F slave, 2I","Number Of Backing Plates":"0","Number Of Command Points":"1","Type Of Unlocking Device":"rotate-to-unlatch mechanism","Material Of The Enclosure":"plastic","Number Of Switching Elements":"2","Product Component Front Ring":"No","Shape Of The Enclosure Front":"Square","Substance Prohibitance (Date)":"05/28/2009","Color Of The Actuating Element":"red","Product Component Light Source":"No","Color Of The Enclosure Top Part":"yellow","Design Of The Actuating Element":"EMERGENCY STOP mushroom pushbutton","Fastening Method Of The Enclosure":"Vertical","Material Of The Actuating Element":"plastic","Shape Of The Installation Opening":"round","Product Component Protective Collar":"No","Product Extension Optional Light Source":"No","reference code according to IEC 81346-2":"S","Type Of Voltage Of The Operating Voltage":"DC","Delivery State Pre-Wired On Strip Terminal":"Yes","Of Contact Blocks, Socket, And Accessories":"Floor mounting","Type Of Electrical Connection On Enclosure":"With insulation-displacement terminal, top","with low demand rate according to SN 31920":"20 %","with high demand rate according to SN 31920":"20 %","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"0","Tightening Torque Of The Screws In The Bracket":"1 ... 1.2 N·m","vibration resistance according to IEC 60068-2-6":"20 ... 200 Hz: 5g"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SF5811-0AA08/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SF5811-0AA08 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the mounting hole size for 3SF5811-0AA08?","answer":"It uses a standard 22 mm diameter round panel cutout, the same as any industrial pushbutton or pilot light."},{"question":"Does 3SF5811-0AA08 have positive opening contacts?","answer":"Yes. Positive opening is explicitly listed, meaning the NC contacts are mechanically forced open when the actuator is pressed, even if welded — required for safety circuits per IEC 60204-1."},{"question":"What compliance documentation is available for 3SF5811-0AA08?","answer":"The substance prohibitance date of 05/28/2009 indicates RoHS compliance. No UL or CSA listing is in the spec record, but the part meets AS-i and positive-opening safety standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF5811-0AA08","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/3SF5811-0AA08 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}}