{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1DA11-0KR0-ZX91","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1DA11-0KR0-ZX91","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1DA11-0KR0-ZX91","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-0KR0-ZX91","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1 series auxiliary switch block, 1 NO + 1 NC, EN 50012, side-mounted, 10 mm, screw terminal, Size S0...S12 for motor contactors, 3RH1921-1DA11-0KR0-ZX91.","salesMarkdown":"The Siemens 3RH1921-1DA11-0KR0-ZX91 is an auxiliary switch block from the SIRIUS 3RH1 series, providing 1 normally-open and 1 normally-closed contact. It mounts on the side of Size S0 through S12 motor contactors, with a 10 mm width and screw terminals, following EN 50012 mounting dimensions. This is a phased-out product — the official successor is the SIRIUS 3RH2 series. The lifecycle stage is listed as current, but the description explicitly marks it as a phased-out product with the successor being the SIRIUS 3RH2 series. The 1 NO + 1 NC contact configuration is standard for signaling contactor position or interlocking in motor control circuits. The EN 50012 profile ensures mechanical compatibility with the S0–S12 contactor frame — a panel builder can snap it on without modifying the existing DIN-rail layout.","metaTitle":"Siemens 3RH1921-1DA11-0KR0-ZX91 Auxiliary Switch Block, 1NO+","metaDescription":"Siemens 3RH1921-1DA11-0KR0-ZX91 auxiliary switch block, 1 NO + 1 NC, screw terminal, Size S0...S12. Phased-out product; successor SIRIUS 3RH2. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=344742&mlfb=3RH1921-1DA11-0KR0-ZX91","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-0KR0-ZX91/alternatives.json"},"ai":{"faq":[{"question":"What is the closest alternative to 3RH1921-1DA11-0KR0-ZX91?","answer":"The manufacturer-designated successor is the SIRIUS 3RH2 series auxiliary switch block. Verify pinout and mounting dimensions against your contactor frame before substituting."},{"question":"Where can I buy 3RH1921-1DA11-0KR0-ZX91?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1DA11-0KR0-ZX91","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/3RH1921-1DA11-0KR0-ZX91 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}}