{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1HA22-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1HA22-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1HA22-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1HA22-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1921-1HA22-ZX95 auxiliary switch block, 2 NO + 2 NC contacts, 10 A rated, screw-type terminals, snap-on mounting for 3RT1 contactors, IP20 front protection.","salesMarkdown":"## Contact ratings and switching reliability The 3RH1921-1HA22-ZX95: Rated at 10 A maximum, the block delivers 6 A at 24 V DC and 6 A at 230 V AC (AC-15). At 400 V AC the rating drops to 3 A; at 690 V AC-15 it holds 1 A. The DC switching curve follows: 6 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. Mechanical service life is 10 million switching cycles typical. ## Integration with 3RT1 contactors Snap-on mounting directly onto the contactor face — no DIN rail required. The block is 44 mm wide, 51 mm deep, and 38 mm tall, sized to sit flush on 3RT1 frames S0 through S12. Screw 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. Front-side IP20 protection covers the terminals.","metaTitle":"Siemens 3RH1921-1HA22-ZX95 SIRIUS Auxiliary Switch Block, 2","metaDescription":"Siemens SIRIUS 3RH1921-1HA22-ZX95 auxiliary switch block, 2 NO + 2 NC contacts, 10 A rated, screw terminals, snap-on for 3RT1 contactors. Phased-out; successor is 3RH2 series. Avai","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=21717&mlfb=3RH1921-1HA22-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1HA22-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What replaces 3RH1921-1HA22-ZX95?","answer":"The official successor is the SIRIUS 3RH2 series auxiliary switch blocks. The 3RH1921-1HA22-ZX95 is a 4-pole block for 3RT1 contactors; the 3RH2 blocks are the current-generation replacement."},{"question":"What is the note 'with 3RT1' on this part?","answer":"The note indicates the auxiliary switch block is designed for mechanical and electrical interlocking with Siemens 3RT1 motor contactors. It snaps onto the contactor face without additional hardware."},{"question":"What are the key ratings of 3RH1921-1HA22-ZX95?","answer":"Maximum 10 A. At 24 V DC: 6 A. At 230 V AC: 6 A. At 400 V AC: 3 A. Mechanical life: 10 million cycles. Contact reliability: 1 fault per 100 million at 17 V, 1 mA. Insulation voltage: 690 V AC at pollution degree 3."},{"question":"Where can I buy 3RH1921-1HA22-ZX95?","answer":"We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is stated here."},{"question":"What is the difference between 3RH1921-1HA22-ZX95 and 3RH2122-1WB40?","answer":"The 3RH1921-1HA22-ZX95 is a 4-pole auxiliary switch block for 3RT1 contactors (S0 to S12), while the 3RH2122-1WB40 is a coupling relay for auxiliary circuits on size S00 contactors. The 3RH2122-1WB40 includes a varistor surge suppressor, has a 30-million-cycle mechanical life, and mounts on DIN rail. They are not direct drop-in replacements — the 3RH1921 snaps onto the contactor; the 3RH2122 mounts separately."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1HA22-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/3RH1921-1HA22-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}}