{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG5842-2AA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG5842-2AA40","canonicalUrl":"https://aoctrl.com/siemens/3UG5842-2AA40","factsUrl":"https://aoctrl.com/api/mcp/products/3UG5842-2AA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG5842-2AA40 digital monitoring relay, current/active current/voltage/cos-phi/power monitoring with IO-Link, up to 690 V AC/DC, up to 10 A, 24 V DC supply, spring-loaded terminals.","salesMarkdown":"The Siemens 3UG5842-2AA40 is a digital monitoring relay that tracks current, active current, voltage, power factor (cos-phi), and power — all through a single device with IO-Link communication. The ON-delay and tripping-delay are independently adjustable from 0.1 to 999.9 seconds, giving you fine control over nuisance trips versus real faults. Output is a single changeover contact, terminated via spring-loaded terminals — no screw torque to verify, just strip and push. The 690 V AC/DC rated supply means this relay can be wired directly into 400 V line-to-line panels without a step-down transformer — common in European and IEC distribution. The 10 A measurement path is the through-conductor rating; the relay itself draws only its 24 V DC control supply from a separate source. IO-Link gives you parameterization and diagnostics over a single M12 cable — no analog scaling or threshold pots to set at the panel. The package dimensions are 127 x 111 x 38 mm — a compact footprint for a multi-parameter relay. It is part of the SIRIUS 3UG monitoring relay family, designed for DIN-rail mounting in control cabinets. The spring-loaded terminals reduce wiring time and eliminate the risk of loose connections from vibration. The IO-Link interface means the relay can be configured and monitored from a PLC or IO-Link master without opening the panel door — useful for remote or hard-to-access installations.","metaTitle":"Siemens 3UG5842-2AA40 Monitoring Relay, IO-Link, 690 VAC/DC","metaDescription":"Siemens 3UG5842-2AA40 digital monitoring relay for current, voltage, power factor, and power. IO-Link, 690 VAC/DC, 10 A, 24 VDC supply, spring-cage terminals. Active production. RF","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"Group Code":"R711","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":"Current, active current, voltage, power factor and power 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/899a57f245dd37c868989514a212183b.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3UG5842-2AA40?tree=CatalogTree","alternativesUrl":"https://aoctrl.com/api/mcp/products/3UG5842-2AA40/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation is available for this relay?","answer":"RoHS compliance is confirmed effective June 1, 2023. REACH Article 33 declares lead (CAS 7439-92-1) above the 0.1% threshold. Export control classification is AL N / ECCN EAR99."},{"question":"What are the key ratings for the 3UG5842-2AA40?","answer":"Supply voltage up to 690 V AC/DC, measurement path up to 10 A, control supply 24 V DC. ON-delay and tripping-delay adjustable 0.1–999.9 seconds. One changeover contact, spring-loaded terminals. IO-Link communication for parameterization and diagnostics."},{"question":"How do I source the 3UG5842-2AA40?","answer":"This is a current-production, stock-item class part. Submit an RFQ for lead time and pricing. It is available through standard Siemens distribution channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG5842-2AA40","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/3UG5842-2AA40 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}}