{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2DA11-ZX90","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2DA11-ZX90","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2DA11-ZX90","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2DA11-ZX90","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS first lateral auxiliary switch, 1 NO + 1 NC, spring-loaded terminals, 10 A rated, for 3RT1 contactors, 3RH1921-2DA11-ZX90.","salesMarkdown":"It is designed to snap onto 3RT1 contactors, adding auxiliary signaling or control feedback directly on the contactor's side. Rated at 10 A maximum, this block handles 10 A at 24 V DC and 6 A at 24 V AC, with derated switching capacity at higher voltages: 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and 0.5 A at 440 V. The 6 kV surge voltage resistance and 500 V insulation rating (pollution degree 3) mean it holds up in industrial panels with transient-heavy loads. The mechanical service life of 10 million switching cycles aligns with the contactor it mounts on. Snap-on mounting to the 3RT1 contactor frame — no tools, no DIN rail. The 10 mm width keeps the assembly compact; the 71 mm depth and 72.5 mm height match the contactor envelope so the auxiliary block does not protrude beyond the contactor's own footprint. Spring-loaded terminals accept 2x (0.5 to 2.5 mm²) without ferrules, or 2x (0.5 to 1.5 mm²) with ferrules, plus 2x (20 to 14 AWG).","metaTitle":"Siemens 3RH1921-2DA11-ZX90 SIRIUS Auxiliary Switch, 1NO+1NC,","metaDescription":"Siemens SIRIUS 3RH1921-2DA11-ZX90 first lateral auxiliary switch, 1 NO + 1 NC, spring-loaded terminals, 10 A rated, for 3RT1 contactors. Active production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT1","Depth":"71 mm","Width":"10 mm","Height":"72.5 mm","Maximum":"10 A","at 24 V":"6 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"6 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"6 A","at 400 V":"3 A","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Brand Name":"SIRIUS","Suitability For Use":"Contactor relay and power contactor","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 440 V rated value":"0.5 A","Instantaneous Contact":"1","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Without Core End Processing":"2x (0.5 ... 2.5 mm²)","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Mechanical Service Life (Switching Cycles) Typical":"10 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals","insulation voltage with degree of pollution 3 at AC rated value":"500 V"}},"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=499486&mlfb=3RH1921-2DA11-ZX90","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2DA11-ZX90/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1921-2DA11-ZX90 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing."},{"question":"What does the 'with 3RT1' note on this auxiliary switch mean?","answer":"The note indicates this auxiliary switch block is designed to mount laterally on Siemens 3RT1 contactors, adding one NO and one NC contact directly to the contactor assembly."},{"question":"What are the key switching ratings for 3RH1921-2DA11-ZX90?","answer":"Rated 10 A maximum. At 24 V it switches 10 A DC or 6 A AC; at 60 V it handles 4.7 A; at 110 V it handles 3 A; at 220 V it handles 1.2 A; at 440 V it handles 0.5 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2DA11-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/3RH1921-2DA11-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}}