{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1XA22-0MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1XA22-0MA0","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1XA22-0MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1XA22-0MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH1921-1XA22-0MA0, 2 NC, snap-on mounting for S0 contactors, AC-15 10 A at 230 V, 6 kV surge voltage resistance.","salesMarkdown":"It carries 2 normally-closed (NC) instantaneous contacts and is rated for AC-15 duty at 10 A at 230 V, with a surge voltage resistance of 6 kV. The snap-on fastening method means it mounts directly onto the contactor without tools, saving DIN-rail space and panel wiring time. The AC-15 rating of 10 A at 230 V is the key switching capacity for solenoid and contactor coil loads — typical in control circuits. The 6 kV surge voltage resistance means it withstands transient overvoltages common in industrial panels without flashover. The mirror contact function per IEC 60947-4-1 (when paired with 3RT1 contactors) provides a positively driven NC contact that reflects the main contact position, critical for safety circuits where you need to detect welding or sticking of power contacts. ## Integration notes Snaps onto the front of any S0-size Siemens contactor or contactor relay (e.g., 3RT10 series). Dimensions are 44 mm wide, 38 mm high, 51 mm deep — it adds only 51 mm to the contactor depth. Wiring accepts 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) with ferrules; AWG equivalents are 2x (20 to 16) and 2x (18 to 14).","metaTitle":"Siemens 3RH1921-1XA22-0MA0 SIRIUS Auxiliary Switch, 2 NC, sn","metaDescription":"Siemens 3RH1921-1XA22-0MA0 SIRIUS auxiliary switch, 2 NC contacts, snap-on for S0 contactors. AC-15 10 A at 230 V, 6 kV surge. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"51 mm","Width":"44 mm","Height":"38 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","at 600 V rated value":"0.26 A","Design Of The Product":"for snapping onto the front, with SUVA approval","Instantaneous Contact":"2","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","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/eabefdd5a140be325d39b13ced46045a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=286042&mlfb=3RH1921-1XA22-0MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1XA22-0MA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source or alternate?","answer":"The 3RH1921-1XA22-0MA0 is a snap-on auxiliary switch for S0 contactors. The closest functional peer is the 3RT1015-1BB42 contactor (which accepts this same auxiliary switch), but that is a different component — a contactor, not an accessory. For a direct drop-in replacement of the auxiliary switch itself, there is no exact second-source; the part is Siemens-specific for the SIRIUS family."},{"question":"Will 3RH1921-1XA22-0MA0 drop into a panel specified around 3RT1015-1BB42?","answer":"Yes — the 3RT1015-1BB42 is an S0-size contactor, and this auxiliary switch is designed to snap onto the front of S0 contactors. No rewiring of the contactor power circuit is needed; the auxiliary switch adds its own terminals for the control circuit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1XA22-0MA0","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/3RH1921-1XA22-0MA0 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}}