{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG5618-2CR21","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG5618-2CR21","canonicalUrl":"https://aoctrl.com/siemens/3UG5618-2CR21","factsUrl":"https://aoctrl.com/api/mcp/products/3UG5618-2CR21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG5 line monitoring relay, 3UG5618-2CR21, digitally adjustable, 3x 90-690 V AC, 15-70 Hz, 2 changeover contacts, spring-loaded terminals, SIL 1/PL c.","salesMarkdown":"## Digitally Adjustable Line Monitor for Phase and Voltage Integrity The Siemens 3UG5618-2CR21 is a digitally adjustable monitoring relay covering phase failure, phase sequence, asymmetry, frequency, and over- and under-voltage on three-phase supplies from 90 to 690 V AC at 15–70 Hz. Two changeover contacts with spring-loaded terminals give you a clean break for control logic, and the SIL 1/PL c rating means it slots into safety-related signal paths without a separate safety relay for basic fault detection. The 90–690 V AC input range covers standard low-voltage motor feeds (400 V, 480 V, 575 V) without a separate PT. Phase asymmetry detection is adjustable, letting you set the trip threshold to match motor sensitivity—tight for critical spindles, looser for general pump duty. The phase sequence correction feature means the relay can swap its own internal logic to maintain correct output signaling even if the incoming phase rotation is reversed, saving a panel rewire.","metaTitle":"Siemens 3UG5618-2CR21 Line Monitoring Relay, 90-690 VAC, 2 C","metaDescription":"Active digitally adjustable monitoring relay for phase failure, sequence, asymmetry, frequency, over/under-voltage. 3x 90-690 VAC, 15-70 Hz, 2 C/O spring terminals. SIL 1/PL c. RFQ","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"title":"3UG5618-2CR21","Group Code":"R711","description":"digitally adjustable monitoring relay phase failure, phase sequence, asymmetry, frequency, over- and under-voltage monitoring with phase sequence correction 3x 90-690 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)":"125.00 x 109.00 x 36.00 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/09fb07c19c619ab8e35f5a8697be7e1b.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3UG5618-2CR21?tree=CatalogTree"},"ai":{"faq":[{"question":"What compliance documentation is available for this relay?","answer":"RoHS compliance is declared effective 01 June 2023. REACH Article 33 declares lead (CAS 7439-92-1) above 0.1% w/w. No export control restrictions (AL: N, ECCN: N)."},{"question":"What are the key ratings of the 3UG5618-2CR21?","answer":"It monitors 3-phase supplies from 90 to 690 V AC, 15–70 Hz, for phase failure, sequence, asymmetry, over- and under-voltage, and frequency. It has two changeover contacts with spring-loaded terminals and is rated SIL 1/PL c."},{"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 catalog sorting and cross-referencing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG5618-2CR21","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/3UG5618-2CR21 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}}