{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1FB11","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1FB11","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1FB11","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FB11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1911-1FB11, 1 NO + 1 NC contacts, 10 A rated, screw-type terminals, snap-on mounting for S00 contactors.","salesMarkdown":"## Siemens SIRIUS 3RH1911-1FB11 — Auxiliary Switch Block, Phased Out It snaps onto DIN rail and accepts screw-type terminals for auxiliary and control circuits, with wire sizes from 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. The 10 A maximum rating applies at 24 V; at higher voltages the current capacity drops — 6 A at 230/250 V, 3 A at 400 V, and 0.26 A at 600 V. For DC switching, the block handles 6 A at 24 V, 2 A at 60 V, and 0.3 A at 220 V. These curves mean the block is best suited for control circuits at typical panel voltages (24 VDC or 230 VAC), not for high-current power paths. The AC-15 rating at 690 V is 1 A, confirming its role in switching solenoid and contactor coils — the standard duty for auxiliary contacts in motor control centers. ## Lifecycle Reality — Phased Out, Successor Available The 3RH1911-1FB11 is a phased-out product. The manufacturer lists the SIRIUS 3RH2911-1FB11 as the preferred successor type. For new designs or BOM replacements, that is the direct drop-in to specify. ## Panel Integration — Snap-On Mounting, S00 Frame The block snaps onto DIN rail (snap-on mounting per) and fits the S00 contactor frame size. Dimensions are 36.5 mm wide, 41.5 mm deep, and 37.5 mm high — it occupies the same footprint as the SIRIUS 3RH2 series auxiliary blocks. The leading contact closes before the main contactor poles, and the lagging contact opens after — a standard arrangement for NC mirror contacts in safety circuits. There is no instantaneous contact (0 per). Front-side protection is IP20, suitable for enclosed panel installation.","metaTitle":"Siemens 3RH1911-1FB11 SIRIUS Auxiliary Switch Block, 10 A, 1","metaDescription":"Siemens SIRIUS 3RH1911-1FB11 auxiliary switch block, 1 NO + 1 NC contacts, 10 A rated, screw terminals, snap-on mounting. Phased-out product; successor 3RH2911-1FB11 available. Sou","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"41.5 mm","Width":"36.5 mm","Height":"37.5 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","Leading Contact":"1","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"1","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":"0","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=530755&mlfb=3RH1911-1FB11","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FB11/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RH1911-1FB11 used for?","answer":"It is an auxiliary switch block used with SIRIUS contactor relays and power contactors in the S00 frame size, providing one NO and one NC contact for control circuits and signaling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1FB11","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/3RH1911-1FB11 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}}