{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1FA22-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1FA22-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1FA22-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1FA22-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 4-pole 2 NO + 2 NC, 10 A, snap-on mounting, screw terminals, 44 x 38 x 51 mm.","salesMarkdown":"The Siemens 3RH1921-1FA22-ZX95 is a 4-pole auxiliary switch block from the SIRIUS family, designed for snap-on mounting alongside 3RT1 contactors and contactor relays. It provides 2 normally-open and 2 normally-closed instantaneous contacts, rated for a maximum of 10 A, with screw-type terminals for the auxiliary and control circuit wiring. The 3RH1921-1FA22-ZX95 is a phased-out product. The manufacturer's official successor is the SIRIUS 3RH2 series. ## Panel Integration Snap-on mounting onto a DIN rail is the intended fastening method, matching the footprint of the 3RT1 contactor it attaches to. Dimensions are 44 mm wide, 38 mm high, and 51 mm deep. The screw-type terminals accept two conductors per clamp: 0.5 to 1.5 mm² or 0.75 to 2.5 mm² with core end processing, or 20 to 16 AWG and 18 to 14 AWG for solid/stranded wire.","metaTitle":"Siemens 3RH1921-1FA22-ZX95 SIRIUS Auxiliary Switch Block, 10","metaDescription":"Siemens SIRIUS 3RH1921-1FA22-ZX95 auxiliary switch block, 4-pole 2 NO + 2 NC, 10 A rated, snap-on mounting. Phased-out product; successor is 3RH2 series. Sourced to order against R","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=277967&mlfb=3RH1921-1FA22-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1FA22-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1921-1FA22-ZX95 and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing."},{"question":"What is the note 'with 3RT1' on this part?","answer":"The note indicates this auxiliary switch block is designed to mount directly onto Siemens 3RT1 contactors and contactor relays as a side-mount accessory."},{"question":"What is the contact configuration and rated current?","answer":"It provides 2 normally-open and 2 normally-closed instantaneous contacts, rated for a maximum of 10 A. At 24 V DC the rated current is 10 A; at 230 V AC it is 6 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1FA22-ZX95","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-ZX95 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}}