{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG5512-2BR21","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG5512-2BR21","canonicalUrl":"https://aoctrl.com/siemens/3UG5512-2BR21","factsUrl":"https://aoctrl.com/api/mcp/products/3UG5512-2BR21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG5 monitoring relay, 3UG5512-2BR21, phase failure / phase sequence / asymmetry monitoring, 3x 160-690 V AC, 15-70 Hz, 2 changeover contacts, spring-loaded terminals.","salesMarkdown":"The Siemens 3UG5512-2BR21 is a line-monitoring relay that watches three-phase supplies for phase failure, incorrect phase sequence, and asymmetry. It operates across 160-690 V AC at 15-70 Hz, covering the common 50/60 Hz industrial mains and the wider frequency range found on generator or variable-frequency feeds. Two changeover contacts give you independent signalling paths — one to a PLC input, another to a local alarm or contactor coil. The 160-690 V AC range means this relay can be wired directly across most low-voltage three-phase systems without an external potential transformer — 400 V, 480 V, and 690 V line-to-line are all within its direct measurement window. The 15-70 Hz bandwidth catches not just the standard 50/60 Hz but also variable-frequency drives running at low output frequencies or emergency generators that droop below 50 Hz. RoHS compliant since 01 June 2023.","metaTitle":"Siemens 3UG5512-2BR21 monitoring relay, phase failure/sequen","metaDescription":"Siemens 3UG5512-2BR21 monitoring relay for phase failure, sequence, and asymmetry. 3x 160-690 V AC, 15-70 Hz, 2 changeover contacts, spring-loaded terminals. Active production, RoH","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"title":"3UG5512-2BR21","Group Code":"R711","description":"monitoring relay phase failure, phase sequence and asymmetry monitoring 3x 160-690 V AC, 15-70 Hz 2 changeover contacts spring-loaded terminal SIL 1/PL c","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":"Line monitoring","lifecycle_stage":"current","Packaging Quantity":"1","Export Control Regulations":"AL : N / ECCN : N","Packaging dimensions (L x W x H)":"131.00 x 112.00 x 33.00 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/a6dc320f09031e396e2ed0edc61e2aa0.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3UG5512-2BR21?tree=CatalogTree"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for this relay?","answer":"RoHS compliance is confirmed since 01 June 2023. The part contains lead above 0.1% w/w, triggering REACH Article 33 duty-to-inform. Export control is AL: N / ECCN: N."},{"question":"What are the key ratings of the 3UG5512-2BR21?","answer":"It monitors three-phase supplies from 160-690 V AC at 15-70 Hz, with two changeover contacts and spring-loaded terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG5512-2BR21","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/3UG5512-2BR21 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}}