{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH6921-1DA02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH6921-1DA02","canonicalUrl":"https://aoctrl.com/siemens/3RH6921-1DA02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH6921-1DA02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary switch, 3RH6921-1DA02, snap-on mounting, S0 size, 10 mm width, IP20, 6 A at 24 V, AC-15 1 A at 690 V.","salesMarkdown":"It snaps onto the DIN rail alongside the main contactor, adding auxiliary contact blocks without increasing the panel's vertical height — the 10 mm width is the only added DIN rail footprint. Rated operational currents vary by voltage: 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V and 250 V, 6 A at 230 V, and 3 A at 400 V. For AC-15 inductive loads at 690 V, it carries 1 A — this is the rating that governs switching of contactor coils and solenoid valves in a 690 V panel. The 3RH6921-1DA02 is a mirror contact per IEC 60947-4-1, meaning its normally closed (NC) contacts mechanically mirror the main contactor's state — essential for safety circuits that must detect a welded contactor. The IP20 front protection means it's safe from finger contact in an enclosed panel but not washdown-rated. Wire termination accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or finely stranded with ferrule — or 2x (20 to 16) and 2x (18 to 14) AWG.","metaTitle":"Siemens 3RH6921-1DA02 SIRIUS Auxiliary Switch, 10 mm, snap-o","metaDescription":"Siemens SIRIUS auxiliary switch 3RH6921-1DA02 for contactor relay S0. Snap-on mounting, IP20, 10 mm wide. AC-15 1 A at 690 V. Current production. Sourced 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":"3RH6921-1DA02","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 NC, size S0, screw terminal DIN EN 50012 and DIN 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":"0","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/94aaf6a6c4d81a0de5f0c70bae2ae6a0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=641407&mlfb=3RH6921-1DA02"},"ai":{"faq":[{"question":"What is 3RH6921-1DA02's listed depth (66 mm) on this component line?","answer":"The depth is 66 mm. Combined with a width of 10 mm and height of 57.4 mm, it fits the standard S0 contactor footprint and adds minimal DIN rail space."},{"question":"Will 3RH6921-1DA02 drop into a panel that was specified around 3RH6140-1BF40 without rewiring?","answer":"Both are S0-size auxiliary switches with snap-on mounting, so the physical fit and DIN rail footprint are identical. The 3RH6921-1DA02 is a laterally mountable design; the 3RH6140-1BF40 is a different block type. Verify the contact configuration and terminal layout against your existing wiring diagram before substitution — the terminal assignments may differ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH6921-1DA02","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/3RH6921-1DA02 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}}