{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG5851-1AA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG5851-1AA40","canonicalUrl":"https://aoctrl.com/siemens/3UG5851-1AA40","factsUrl":"https://aoctrl.com/api/mcp/products/3UG5851-1AA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG5851-1AA40 digital monitoring relay, speed monitoring 0.1 to 6000 r/min, overshoot and undershoot, IO-Link, 24 V DC, 2 changeover contacts, screw terminal.","salesMarkdown":"## Speed monitoring relay with IO-Link The Siemens 3UG5851-1AA40 is a digital monitoring relay purpose-built for speed supervision on rotating machinery — conveyors, fans, pumps, and spindle drives — where detecting an overshoot or undershoot condition is critical to process integrity or equipment protection. It covers a detection range from 0.1 to 6000 r/min, which means it handles everything from slow-turning agitators to high-speed spindles in a single device, without needing a separate pickup sensor. The relay integrates IO-Link communication, so the speed setpoints, trip delays, and actual speed values can be read or written over the IO-Link master, eliminating manual potentiometer adjustments on the panel door. The 0.1 to 6000 r/min range determines the pulse-train frequency the relay can evaluate from a proximity switch or encoder input. ## Integration notes Supply voltage is 24 V DC — standard for control panels. The screw terminals accept 0.2–2.5 mm² conductors; strip length 8 mm. The relay's ON delay and tripping delay are set via IO-Link or, if IO-Link is not used, through the front-panel rotary switches (the description confirms both methods). The two changeover contacts are rated for typical control loads; verify the contact rating against your specific load (e.g., a 24 V DC solenoid or a 230 V AC contactor coil) to ensure adequate service life. The 38 mm housing width fits standard DIN-rail spacing alongside other SIRIUS 3UG5 series monitors.","metaTitle":"Siemens 3UG5851-1AA40 Speed Monitoring Relay, 0.1-6000 r/min","metaDescription":"Siemens 3UG5851-1AA40 digital monitoring relay for speed overshoot/undershoot, 0.1-6000 r/min, IO-Link, 24 V DC, 2 changeover contacts. Active production, RoHS compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"title":"3UG5851-1AA40","Group Code":"R711","description":"digital monitoring relay speed monitoring from 0.1 to 6000 r/min overshoot and undershoot for IO-Link supply voltage 24 V DC ON delay and tripping delay 0.1..999.9 s 2 changeover contacts screw terminal","Product Group":"5885","Product class":"A: Standard product which is a stock item could be returned within the returns guidelines/period.","Quantity Unit":"1 Piece","Product Family":"Speed monitoring","lifecycle_stage":"current","Packaging Quantity":"1","Export Control Regulations":"AL : N / ECCN : EAR99","Packaging dimensions (L x W x H)":"127.00 x 111.00 x 38.00 mm","Compliance with the substance restrictions according to RoHS directive":"Since: 01-06-23","REACH Art. 33 Duty to inform according to the current list of candidates":"Lead CAS-No. 7439-92-1 > 0,1 % (w / w)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/639b612c074efa7fae4c86edcd31998a.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3UG5851-1AA40?tree=CatalogTree"},"ai":{"faq":[{"question":"What is the group code and product group for this part?","answer":"Group Code R711, Product Group 5885. These are Siemens internal classification codes used for BOM tracking and family-level PCN notifications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG5851-1AA40","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/3UG5851-1AA40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}