{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1FA22-ZW98","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1FA22-ZW98","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1FA22-ZW98","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1FA22-ZW98","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1921-1FA22-ZW98, 4-pole 2 NO + 2 NC, 10 A, snap-on mounting, phased out with successor 3RH2.","salesMarkdown":"The Siemens SIRIUS 3RH1921-1FA22-ZW98 is an attachable auxiliary switch block designed to snap onto 3RT1 series power contactors and contactor relays. It adds four poles of auxiliary contacts — 2 normally open and 2 normally closed — to the base contactor, following the EN 50005 terminal numbering standard. Rated for a maximum current of 10 A, the auxiliary contacts carry a range of switching capacities across different voltage levels: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, 3 A at 400 V, and 0.3 A at 220 V. The contacts are rated for AC-15 duty at 690 V at 1 A, which covers solenoid and electromagnetic load switching typical in control circuits. This part is a phased-out product. The manufacturer lists it as current but with a clear successor: the SIRIUS 3RH2 series. The 3RH1921-1FA22-ZW98 is sold in multi-unit packaging of 40 pieces. For new designs or BOM lines that need a long-term supply commitment, the 3RH2 series is the official replacement path. The block snaps onto the front of a 3RT1 contactor and also onto the DIN rail via the contactor's own mounting foot. Dimensions are 44 mm wide, 51 mm deep, and 38 mm high — it adds minimal depth to the contactor assembly. Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or 2x (20 to 16) and 2x (18 to 14) AWG.","metaTitle":"Siemens 3RH1921-1FA22-ZW98 SIRIUS Auxiliary Switch Block, 10","metaDescription":"Siemens SIRIUS 3RH1921-1FA22-ZW98 attachable auxiliary switch block, 4-pole 2 NO+2 NC, 10 A max, snap-on mount. Phased out; successor is SIRIUS 3RH2. 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","Maximum":"10 A","at 24 V":"6 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"6 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"6 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 Brand Name":"SIRIUS","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","Instantaneous Contact":"2","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","at AC-15 at 690 V rated value":"1 A","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)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Mechanical Service Life (Switching Cycles) Typical":"10 000 000","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"}},"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=412640&mlfb=3RH1921-1FA22-ZW98","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1FA22-ZW98/alternatives.json"},"ai":{"faq":[{"question":"What replaces the 3RH1921-1FA22-ZW98?","answer":"The official successor is the SIRIUS 3RH2 series auxiliary switch block. The 3RH2 is the form-fit-function replacement for the 3RH1921-1FA22-ZW98 when used with 3RT1 contactors."},{"question":"What does the note 'with 3RT1' mean?","answer":"It means this auxiliary switch block is designed to attach directly to Siemens SIRIUS 3RT1 series power contactors and contactor relays. It snaps onto the front of the contactor and shares the same DIN-rail mounting."},{"question":"What are the key ratings for the 3RH1921-1FA22-ZW98?","answer":"Maximum current is 10 A. Contact configuration is 2 NO + 2 NC. AC-15 rating at 690 V is 1 A. Mechanical life is 10 million cycles typical. Operating temperature range is -25 to +60 °C. Insulation voltage is 690 V at pollution degree 3. Surge voltage resistance is 6 kV."},{"question":"How do I source the 3RH1921-1FA22-ZW98?","answer":"This phased-out part is sourced through the surplus and broker channel. It is quoted to order against an RFQ — not stocked as a production-run item. Submit an RFQ for current availability and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1FA22-ZW98","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/3RH1921-1FA22-ZW98 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}}