{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2FE22","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2FE22","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2FE22","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2FE22","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1921-2FE22 auxiliary switch block, 1 NO + 1 NC, spring-loaded terminals, snap-on mounting for 3RT1 contactors, 5 million mechanical cycles, IP20 front.","salesMarkdown":"It provides one normally-open and one normally-closed instantaneous contact, wired through spring-loaded terminals that accept 2x (0.5... 1.5 mm²) with ferrule or 2x (0.5... 2.5 mm²) solid/stranded, plus 2x (20... 14) AWG. Rated at 0.3 A at both 24 V and 60 V, this switch is sized for low-current control signals — think PLC inputs, contactor coils, or indicator lamps. Mechanical life is 5 million switching cycles typical, so in a conveyor line cycling once every 10 seconds it'll outlast the machine's overhaul interval. Snap-on mounting onto the contactor's front face — no tools, no DIN rail. The block measures 44 mm wide, 38 mm high, and 51 mm deep, so it adds minimal depth to the contactor stack. Spring-loaded terminals mean no screw tightening; strip to 8 mm, push the wire in.","metaTitle":"Siemens 3RH1921-2FE22 SIRIUS Auxiliary Switch, 1 NO + 1 NC,","metaDescription":"Siemens 3RH1921-2FE22 SIRIUS auxiliary switch block, 1 NO + 1 NC, spring-loaded terminals, 5M mechanical cycles. Phased out; successor is 3RH2 series. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RT1","Depth":"51 mm","Width":"44 mm","Height":"38 mm","at 24 V":"0.3 A","at 60 V":"0.3 A","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Brand Name":"SIRIUS","Suitability For Use":"Contactor relay and power contactor","Instantaneous Contact":"2","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Without Core End Processing":"2x (0.5 ... 2.5 mm²)","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Mechanical Service Life (Switching Cycles) Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"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=38012&mlfb=3RH1921-2FE22","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2FE22/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1921-2FE22 and get a price?","answer":"We source this part to order through independent distribution. Submit an RFQ; availability and current pricing are confirmed at quote time."},{"question":"What is the note 'with 3RT1' on this component?","answer":"It means the 3RH1921-2FE22 is designed to mount onto Siemens 3RT1 contactors and contactor relays as a front-mounted auxiliary switch block."},{"question":"What is the depth of 3RH1921-2FE22?","answer":"The depth is 51 mm, with a width of 44 mm and height of 38 mm."},{"question":"Will 3RH1921-2FE22 drop into a panel built around 3RT5056-8AP38-0PR0?","answer":"No. The 3RT5056-8AP38-0PR0 is a SIRIUS power contactor of a different frame size and series. The 3RH1921-2FE22 is designed for 3RT1 contactors, not the 3RT5 series. Check the 3RH2 successor block for compatibility with newer contactor frames."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2FE22","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/3RH1921-2FE22 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}}