{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1DA11-ZX90","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1DA11-ZX90","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1DA11-ZX90","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-ZX90","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, first lateral auxiliary switch, 1 NO + 1 NC, screw terminal, for 3RT1 contactors, 10 A at 24 V, snap-on mounting.","salesMarkdown":"The Siemens 3RH1921-1DA11-ZX90 is a first lateral auxiliary switch from the SIRIUS family, designed to snap onto 3RT1 contactors. With a mechanical service life of 10 million switching cycles, it's built for high-throughput panel applications where the main contactor's auxiliary contacts are already consumed or you need additional isolated feedback. Snap-on mounting means this block clips directly onto the front of a 3RT1 contactor without tools — no extra DIN rail space, no brackets. The 10 mm width matches the contactor's profile, so it doesn't widen the footprint. Screw terminals accept 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) with core-end processing, or 2x (20...16) and 2x (18...14) AWG. Strip length is standard; a 6 kV surge voltage resistance covers most industrial environments. Current ratings are given per the contact duty: 10 A at 24 V, 6 A at 125 V, 6 A at 230 V, 3 A at 400 V. The DC curve drops faster — 6 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. That's typical for a general-purpose auxiliary switch; if you're switching a DC solenoid at 110 V, the 1 A limit is the one that governs.","metaTitle":"Siemens 3RH1921-1DA11-ZX90 SIRIUS Auxiliary Switch, 1NO+1NC,","metaDescription":"Siemens SIRIUS 3RH1921-1DA11-ZX90 first lateral auxiliary switch, 1 NO + 1 NC, screw terminals, for 3RT1 contactors. Rated 10 A at 24 V. Active, available to order against RFQ.","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":"80 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), 2x (0.75 ... 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 ... 16), 2x (18 ... 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":"screw-type 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=471976&mlfb=3RH1921-1DA11-ZX90","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-ZX90/alternatives.json"},"ai":{"faq":[{"question":"What contactors does 3RH1921-1DA11-ZX90 mount on?","answer":"It is designed for the 3RT1 contactor series — snaps onto the front without extra DIN rail."},{"question":"What are the key ratings of 3RH1921-1DA11-ZX90?","answer":"Rated 10 A at 24 V AC/DC, with a 6 kV surge voltage resistance and a mechanical life of 10 million switching cycles. Wire range 0.5...2.5 mm² screw terminals."},{"question":"Where can I buy 3RH1921-1DA11-ZX90?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. 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-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-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}}