{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1DA11-0KR0-ZX90","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1DA11-0KR0-ZX90","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1DA11-0KR0-ZX90","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-0KR0-ZX90","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1921-1DA11-0KR0-ZX90, auxiliary switch block, 1 NO + 1 NC, EN 50012, side-mounted, 10 mm, screw terminal, Size S0 to S12, phased-out product.","salesMarkdown":"The Siemens 3RH1921-1DA11-0KR0-ZX90 is a side-mounted auxiliary switch block for motor contactors in the S0 through S12 frame sizes. It provides one normally-open and one normally-closed contact, wired via screw terminals on a 10 mm pitch per EN 50012. This is a special-purpose device, and the manufacturer has designated it as a phased-out product. ## Lifecycle and Replacement The lifecycle stage for this order code is listed as current, but the description explicitly states it is a phased-out product. The official successor is the SIRIUS 3RH2 series. ## Sourcing For new designs or long-term BOM stability, the SIRIUS 3RH2 successor is the recommended specification.","metaTitle":"Siemens 3RH1921-1DA11-0KR0-ZX90 Auxiliary Switch Block, 1NO+","metaDescription":"Siemens 3RH1921-1DA11-0KR0-ZX90 auxiliary switch block, 1 NO + 1 NC, screw terminal, 10 mm, for S0-S12 contactors. Phased-out product; successor is SIRIUS 3RH2. Sourced to order ag","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=359991&mlfb=3RH1921-1DA11-0KR0-ZX90","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-0KR0-ZX90/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 3RH1921-1DA11-0KR0-ZX90?","answer":"The official replacement is the SIRIUS 3RH2 series auxiliary switch block. It is the manufacturer-designated successor and should be evaluated for pin-compatibility and mounting dimensions against the specific contactor frame."},{"question":"Where can I buy 3RH1921-1DA11-0KR0-ZX90?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and pricing are confirmed at quote time. Submit an RFQ for current sourcing options."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1DA11-0KR0-ZX90","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-ZX90 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}}