{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2FA22-ZW96","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2FA22-ZW96","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2FA22-ZW96","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2FA22-ZW96","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1921-2FA22-ZW96, 2 NO + 2 NC, spring-loaded terminals, rated 10 A at 24 V DC, snap-on mounting for contactor sizes S0 to S12.","salesMarkdown":"It snaps onto contactor sizes S0 through S12, adding four auxiliary poles to a contactor relay or motor contactor. The \"with 3RT1\" note on the spec line means this block is designed to mount directly alongside the 3RT1 contactor family. The AC-15 rating at 690 V (1 A) confirms it can switch solenoid loads in higher-voltage control schemes. This part is a phased-out product. The official successor is the SIRIUS 3RH2 series. For a BOM line that currently specifies 3RH1921-2FA22-ZW96, the replacement path is the 3RH2 auxiliary contactor block — but verify the mounting interface and terminal layout, since the 3RH2 series uses a different housing depth (73 mm vs. 51 mm) and width (45 mm vs. 44 mm), so a panel re-drill or adapter bracket may be needed. Sourcing is through independent distribution channels. No last-time-buy window is in effect from the manufacturer, so the surplus channel is the practical supply route for this order code. ## Integration notes Snap-on mounting onto a contactor — no screws, no DIN rail. The block occupies 44 mm width, 51 mm depth, and 38 mm height. Spring-loaded terminals accept 2x (0.5 to 2.5 mm²) without ferrules, or 2x (0.5 to 1.5 mm²) with core-end processing. AWG range is 2x (20 to 14). The IP20 front protection is standard for enclosed panel gear — no washdown rating here. Mechanical service life is 10 million switching cycles typical.","metaTitle":"Siemens 3RH1921-2FA22-ZW96 SIRIUS Auxiliary Switch Block, 10","metaDescription":"Siemens SIRIUS 3RH1921-2FA22-ZW96 auxiliary switch block, 2 NO + 2 NC, spring-loaded terminals, 10 A rated. Phased-out; successor is SIRIUS 3RH2. Sourced to order against RFQ.","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=337713&mlfb=3RH1921-2FA22-ZW96","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2FA22-ZW96/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RH1921-2FA22-ZW96?","answer":"The closest functional replacement is the SIRIUS 3RH2122-2BG40 auxiliary contactor block. It offers the same 2 NO + 2 NC contact arrangement and spring-loaded terminals, but its housing is deeper (73 mm vs. 51 mm) and wider (45 mm vs. 44 mm), so panel fit must be verified before substitution."},{"question":"What does the 'with 3RT1' note mean on this part?","answer":"It means the auxiliary switch block is designed to mount directly onto Siemens 3RT1 contactor relays and motor contactors. The block snaps onto the contactor's front or side without additional hardware."},{"question":"Where can I buy 3RH1921-2FA22-ZW96?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time — no stock figures are published on this listing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2FA22-ZW96","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/3RH1921-2FA22-ZW96 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}}