{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1KA02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1KA02","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1KA02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1KA02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH1921-1KA02, for S0 contactors, 10 A AC-12, 6 kV surge, IP20, screw terminals, snap-on mounting.","salesMarkdown":"It adds one normally-open mirror contact per IEC 60947-4-1, rated for 10 A in AC-12 duty and carrying a 6 kV surge voltage rating. The 10 mm width means it tucks into a tight DIN-rail row without crowding adjacent devices. Snap-on mounting to the contactor's front or side; a second unit can be mounted laterally, so you can stack two auxiliary blocks on one S0 base without extra brackets. Screw-type terminals accept 2x (0.5…1.5 mm²) solid or 2x (0.75…2.5 mm²) stranded, or 2x (20…16) and 2x (18…14) AWG. Strip length is standard for the terminal — no special tooling needed.","metaTitle":"Siemens 3RH1921-1KA02 SIRIUS Auxiliary Switch, 10 A AC-12, s","metaDescription":"Siemens 3RH1921-1KA02 SIRIUS auxiliary switch for S0 contactors. 10 A AC-12, 6 kV surge, IP20, screw terminals. Snap-on mounting. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"71 mm","Width":"10 mm","Height":"80 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 ... 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","Design Of The Product":"second can be mounted laterally","Instantaneous Contact":"0","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 ... 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; with 3RT1","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":"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":"https://cdn.aoctrl.com/8632ae4f3944cf9847414e51a4353392.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=84198&mlfb=3RH1921-1KA02","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1KA02/alternatives.json"},"ai":{"faq":[{"question":"What is the width of 3RH1921-1KA02?","answer":"10 mm wide, which fits the S0 contactor profile and allows lateral stacking of a second block."},{"question":"What compliance documentation is available for 3RH1921-1KA02?","answer":"RoHS compliance with a substance prohibitance date of 07/01/2006, IP20 protection on the front, and a 6 kV surge voltage rating. The mirror contact meets IEC 60947-4-1 requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1KA02","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/3RH1921-1KA02 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}}