{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RQ4128-2AB30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RQ4128-2AB30","canonicalUrl":"https://aoctrl.com/siemens/3RQ4128-2AB30","factsUrl":"https://aoctrl.com/api/mcp/products/3RQ4128-2AB30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RQ4 coupling relay, 3RQ4128-2AB30, 24 V AC/DC coil, 1 changeover contact, 6 A thermal current, spring-loaded push-in terminals, 6.2 mm width, with H-0-A switch.","salesMarkdown":"The Siemens 3RQ4128-2AB30 is a SIRIUS 3RQ4 coupling relay in the narrow 6.2 mm housing, designed for isolating and switching control signals in industrial panels. It carries a 24 V AC/DC coil and one changeover contact rated at 6 A thermal current, with an integrated H-0-A (Hand-Off-Auto) switch for local override during commissioning or maintenance. The 6.2 mm width saves rail space compared to conventional 14 mm or 17.5 mm relay sockets — useful when packing multiple signal isolators into a control cabinet. RoHS compliance is confirmed effective 26 September 2024, and REACH candidate-list information is available from Siemens. No UL or CSA listing is stated in the product record, so verify site-specific approval requirements before specifying for a UL 508A panel. ## Integration notes The H-0-A switch protrudes slightly from the face; allow clearance for the switch lever when mounted next to other relays or terminal blocks. Packaged singly (1 piece per unit). Shipping dimensions are 95 x 93 x 65 mm — small enough for consolidated orders with other SIRIUS control gear.","metaTitle":"Siemens 3RQ4128-2AB30 SIRIUS 3RQ4 Coupling Relay, 24 V AC/DC","metaDescription":"Siemens 3RQ4128-2AB30 SIRIUS 3RQ4 coupling relay with H-0-A switch, 24 V AC/DC coil, 1 changeover contact, 6 A thermal current, push-in terminals. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Control Accessories"],"specifications":{"title":"3RQ4128-2AB30","Group Code":"R711","description":"H-0-A coupler with plug-in relay, 24 V AC/DC, 1 change-over contact, spring-loaded terminal (push-in), width 6.2 mm, thermal current 6 A, with H-0-A switch","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 : N","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":"Reach Information"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/334560fce68ab2ab962b90c797e183d4.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3RQ4128-2AB30?tree=CatalogTree"},"ai":{"faq":[{"question":"What compliance documentation is available for this part?","answer":"RoHS compliance is confirmed from 26 September 2024. REACH Article 33 duty-to-inform data is available from Siemens. No UL, CSA, or IEC certification is listed in the product record."},{"question":"What are the key ratings for the 3RQ4128-2AB30?","answer":"24 V AC/DC coil voltage, 1 changeover contact rated at 6 A thermal current, with a push-in spring-loaded terminal system. The housing is 6.2 mm wide for high-density DIN-rail mounting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RQ4128-2AB30","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/3RQ4128-2AB30 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}