{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RQ4052-2SM50","brand":"Siemens","brandSlug":"siemens","productSlug":"3RQ4052-2SM50","canonicalUrl":"https://aoctrl.com/siemens/3RQ4052-2SM50","factsUrl":"https://aoctrl.com/api/mcp/products/3RQ4052-2SM50","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RQ4 coupling relay, output optocoupler, 24 V DC, 1 NO contact, spring-loaded push-in terminal, width 6.2 mm, thermal current 2 A.","salesMarkdown":"The Siemens 3RQ4052-2SM50 is an output optocoupler from the SIRIUS 3RQ4 series of coupling relays in the narrow 6.2 mm housing. It switches a single normally-open contact rated for a thermal current of 2 A, controlled by a 24 V DC input. At 6.2 mm wide, this coupling relay occupies minimal DIN-rail space — useful when isolating a PLC digital output from a downstream load or signal conditioning in a crowded control cabinet. The 24 V DC coil side is optically isolated from the contact side, so it can separate control and power circuits within the same enclosure without shared ground loops. ## What the 2 A rating means The 2 A thermal current (Ith) is the continuous carry rating at ambient temperature — it governs the maximum steady-state load through the contact. For switching inductive loads like small relays or solenoid valves, derate below that figure; the optocoupler's semiconductor output handles the switching, not a mechanical contact, so no arc-erosion wear to track over cycles.","metaTitle":"Siemens 3RQ4052-2SM50 SIRIUS Coupling Relay, 24 V DC, 2 A","metaDescription":"Siemens 3RQ4052-2SM50 SIRIUS 3RQ4 output optocoupler, 24 V DC, 1 NO, 2 A thermal current, push-in terminals, 6.2 mm wide. Active production, RoHS compliant since 26-09-24.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Control Accessories"],"specifications":{"title":"3RQ4052-2SM50","Group Code":"R711","description":"output optocoupler, 24 V DC, 1 NO contact, spring-loaded terminal (push-in), width 6.2 mm, thermal current 2 A","Product Group":"4950","Product class":"A: Standard product which is a stock item could be returned within the returns guidelines/period.","Quantity Unit":"1 Piece","Product Family":"SIRIUS 3RQ4 coupling relays, narrow design","lifecycle_stage":"current","Packaging Quantity":"1","Export Control Regulations":"AL : N / ECCN : EAR99","Packaging dimensions (L x W x H)":"95.00 x 93.00 x 65.00 mm","Compliance with the substance restrictions according to RoHS directive":"Since: 26-09-24","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/3a6920082a6868b614a38082a88a96e4.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3RQ4052-2SM50?tree=CatalogTree"},"ai":{"faq":[{"question":"What compliance documentation is available for this coupling relay?","answer":"RoHS compliance is declared effective 26 September 2024. Under REACH Article 33, the part contains lead (CAS 7439-92-1) above 0.1% w/w. No UL or IEC certification numbers appear in the available spec record."},{"question":"What are the key ratings for the 3RQ4052-2SM50?","answer":"24 V DC control input, one normally-open output contact rated for 2 A thermal current, housed in a 6.2 mm wide package with push-in spring-loaded terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RQ4052-2SM50","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/3RQ4052-2SM50 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}}