{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH6921-1DA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH6921-1DA20","canonicalUrl":"https://aoctrl.com/siemens/3RH6921-1DA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH6921-1DA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH6921-1DA20, 2 NO contacts, 10 A rated operational current, snap-on mounting for S0 contactor relays and power contactors, IP20 front protection.","salesMarkdown":"The mirror contact design per IEC 60947-4-1 ensures the NC contact reflects the main contact state — critical for safety circuits where a welded main contact must not go undetected. Width of 10 mm and depth of 66 mm keep the auxiliary block compact on the DIN rail. Snap-on fastening means no tools for initial mount — press onto the contactor side until the latch engages. The IP20 front protection is standard for enclosed panels; no washdown rating here, so keep it behind a gland plate or cabinet door. Rated operational current varies by voltage: 6 A at 24 V and 230 V, 3 A at 400 V, 1 A at 690 V AC-15. For DC switching, the block handles 6 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220/250 V.","metaTitle":"Siemens 3RH6921-1DA20 SIRIUS Auxiliary Switch, 2 NO, 10 A, s","metaDescription":"Siemens SIRIUS 3RH6921-1DA20 auxiliary switch, 2 NO contacts, 10 A rated, snap-on mounting for S0 contactors. IP20 front, mirror contact per IEC 60947-4-1. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"66 mm","Width":"10 mm","title":"3RH6921-1DA20","Height":"57.4 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","description":"Lateral AUX. switch block, for motor contactors 2 NO, size S0, screw terminal EN 50005","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"0","Size Of Contactor":"S0","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 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","at 600 V rated value":"0.26 A","Design Of The Product":"first laterally mountable","Instantaneous Contact":"2","Substance Prohibitance (Date)":"05/01/2012","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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","operational current at AC-15 at 690 V rated value":"1 A","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":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e4484d403a5997ea6d72ce632a4c9717.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=641409&mlfb=3RH6921-1DA20"},"ai":{"faq":[{"question":"Where can I buy 3RH6921-1DA20 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"Will 3RH6921-1DA20 drop into a panel that was specified around 3RH2122-1BA40 without rewiring?","answer":"Both are SIRIUS auxiliary switches for S0 contactors with snap-on mounting, but the 3RH2122-1BA40 has a different contact arrangement and ratings. The 3RH6921-1DA20 provides 2 NO contacts; the 3RH2122-1BA40 may have a different NO/NC mix. Check the contact configuration of the existing panel before swapping — the mechanical footprint (width, depth, snap-on rail) is the same, but the wiring may need adjustment if the contact count differs."},{"question":"What compliance documentation does Siemens provide for 3RH6921-1DA20?","answer":"The part carries a substance prohibition date of 05/01/2012, indicating RoHS compliance. The mirror contact design meets IEC 60947-4-1. Standard documentation includes the declaration of conformity and the product datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH6921-1DA20","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/3RH6921-1DA20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}