{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF5811-0AB08","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF5811-0AB08","canonicalUrl":"https://aoctrl.com/siemens/3SF5811-0AB08","factsUrl":"https://aoctrl.com/api/mcp/products/3SF5811-0AB08","rawCanonicalId":null},"summary":{"shortDescription":"Siemens AS-Interface emergency-stop, 22 mm mounting diameter, IP65, plastic enclosure, rotate-to-unlatch, 1 slave, F slave 2I, positive opening, 2 switching elements, red mushroom pushbutton, yellow enclosure top.","salesMarkdown":"The Siemens 3SF5811-0AB08 is an AS-Interface emergency-stop slave with a 22 mm mushroom pushbutton and positive-opening contact block. The slave type is F slave, 2I, reporting E-stop state as two input bits over the AS-i bus. Mounts in a standard 22 mm round panel cutout. The enclosure is square-fronted, 85 mm wide by 85 mm tall by 106 mm deep. Fastening is vertical or horizontal, and the delivery state is pre-wired on a strip terminal — no separate wiring of the AS-i flat cable required; the slave clips directly onto the yellow AS-i cable. The rotate-to-unlatch mechanism means the operator twists the mushroom head to release it after an emergency stop, not a key or a pull. A protective collar is included to prevent accidental actuation from side impact. ## What the 2 Switching Elements Give You Two switching elements means the contact block provides two independent NC contacts. In a safety circuit, one NC contact typically goes to the AS-i slave input, and the other can be wired in series with a hardwired safety relay or PLC input for redundancy. The DC rated voltage for the contacts is 30 V — consistent with the AS-i bus voltage (typically 30 VDC). No light source or lamp holder is included — this is a pure pushbutton, not an illuminated E-stop.","metaTitle":"Siemens 3SF5811-0AB08 AS-i E-Stop, 22mm, IP65, 2NC","metaDescription":"Siemens 3SF5811-0AB08 AS-Interface emergency stop with positive opening, IP65, 22mm mount, 2 switching elements. Current production, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Safety Interlock Switches"],"specifications":{"Depth":"106 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 / horizontal","Material Of The Actuating Element":"plastic","Shape Of The Installation Opening":"round","Product Component Protective Collar":"Yes","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/3SF5811-0AB08/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for 3SF5811-0AB08?","answer":"It is an AS-Interface emergency-stop slave with a 22 mm mounting diameter, IP65 protection, positive-opening NC contacts, 2 switching elements rated at 30 VDC, and an operating temperature range of -25 to +70 °C."},{"question":"Does 3SF5811-0AB08 have positive opening?","answer":"Yes, positive opening is confirmed — the NC contacts are mechanically forced open when the actuator is pressed, even if the contacts have welded. This is the safety-critical feature required for emergency-stop devices per IEC 60947-5-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF5811-0AB08","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/3SF5811-0AB08 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}}