{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2DA11","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2DA11","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2DA11","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2DA11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH1921-2DA11, first laterally mountable, snap-on for S0 contactors, spring-loaded terminals, 10 A at 24 V, IP20 front.","salesMarkdown":"The Siemens 3RH1921-2DA11 is a SIRIUS auxiliary switch designed for lateral snap-on mounting to S0-frame contactors and contactor relays. It adds one instantaneous normally-open contact to the switching block, letting you pick up status feedback or interlock signals without extra wiring layers. Rated for 10 A at 24 V (AC-12) and 6 A at 24 V for general-purpose switching, with derated curves up to 400 V at 3 A. The spring-loaded terminals accept 2x (0.5 to 2.5 mm²) solid or stranded, or 2x (20 to 14 AWG) — no screwdriver needed for the control-circuit connections. The 3RH1921-2DA11 is listed as current production.","metaTitle":"Siemens 3RH1921-2DA11 SIRIUS Auxiliary Switch, 10 A, 24 V, s","metaDescription":"Siemens 3RH1921-2DA11 SIRIUS auxiliary switch, 10 A at 24 V, snap-on for S0 contactors. IP20 front. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"71 mm","Width":"10 mm","Height":"72.5 mm","at 24 V":"6 A","at 48 V":"2 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"0.9 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"0.3 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 Category":"Auxiliary switch","Size Of Contactor":"S0","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch","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","Design Of The Product":"first laterally mountable","Instantaneous Contact":"1","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes; with 3RT1","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","operational current of auxiliary contacts at AC-12 maximum":"10 A","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","number of CO contacts of auxiliary contacts instantaneous contact":"0","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"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=224621&mlfb=3RH1921-2DA11","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2DA11/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH1921-2DA11 drop into a panel that was specified around 3RH2122-2AV60 without rewiring?","answer":"No — the 3RH2122-2AV60 is a different frame size (S2/S3) with a different mounting footprint and terminal layout. The 3RH1921-2DA11 is sized for S0 contactors only and will not mechanically fit an S2/S3 panel cutout without adapter hardware."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2DA11","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 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}}