{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2HA22-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2HA22-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2HA22-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2HA22-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1921-2HA22-ZX95, 2 NO + 2 NC, EN 50012, spring-type terminals, 10 A at 24 V.","salesMarkdown":"It uses spring-loaded terminals for the auxiliary and control circuit wiring, accepting 2x (0.5... 1.5 mm²) with core end processing or 2x (0.5... 2.5 mm²) without. The block is noted for use with 3RT1 contactors, extending the auxiliary contact count on the power contactor or contactor relay. The contacts are rated for a maximum of 10 A, with specific current ratings at various voltages: 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. For DC switching, the rated values are 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. The AC-15 rating at 690 V is 1 A, which governs the switching of inductive loads like contactor coils at that voltage. The surge voltage resistance is rated at 6 kV, and the insulation voltage at AC with degree of pollution 3 is 690 V. This part is a phased-out product. The official successor is the SIRIUS 3RH2 series. The successor, 3RH2122-2BG40, is a direct-form-fit replacement with spring-loaded terminals and the same contact configuration (2 NO + 2 NC), but note the depth increases from 51 mm to 73 mm and width from 44 mm to 45 mm, so panel layout should be verified before substitution. The block is 51 mm deep, 44 mm wide, and 38 mm tall, so it fits within the standard S00 contactor footprint.","metaTitle":"Siemens 3RH1921-2HA22-ZX95 Auxiliary Switch Block, 2 NO + 2","metaDescription":"Siemens SIRIUS auxiliary switch block 3RH1921-2HA22-ZX95, 2 NO + 2 NC, spring-loaded terminals, 10 A at 24 V. Phased-out product; successor is 3RH2 series. Sourced to order against","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)","Without Core End Processing":"2x (0.5 ... 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 ... 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":"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=195970&mlfb=3RH1921-2HA22-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2HA22-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the successor to 3RH1921-2HA22-ZX95?","answer":"The official successor is the SIRIUS 3RH2 series. A direct replacement candidate is 3RH2122-2BG40, which has the same 2 NO + 2 NC contact configuration and spring-loaded terminals, but check the increased depth (73 mm vs 51 mm) and width (45 mm vs 44 mm) for panel fit."},{"question":"What does the note 'with 3RT1' mean?","answer":"The auxiliary switch block is designed for use with Siemens 3RT1 contactors and contactor relays. It mounts directly onto the contactor to add auxiliary contacts without additional wiring."},{"question":"Where can I buy 3RH1921-2HA22-ZX95?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2HA22-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/3RH1921-2HA22-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}}