{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1FA20-ZW95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1FA20-ZW95","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1FA20-ZW95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA20-ZW95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1911-1FA20-ZW95, 2 NO contacts per EN 50005, screw terminal, snap-on for size S00 contactors, 10 A maximum, IP20 front.","salesMarkdown":"It snaps onto the front of the device — no tools, no extra DIN-rail space — and terminates via screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) per clamp. Because this is an auxiliary switch block, the ratings that matter are the contact currents at the voltage you are switching — not a motor-load rating. At 24 V it handles 6 A; at 125 V it handles 6 A; at 230 V it handles 6 A; at 400 V it derates to 3 A. For DC control circuits, the 24 V rated value is 10 A, dropping to 0.26 A at 600 V. The 6 kV surge voltage resistance and 690 V insulation voltage (pollution degree 3) mean it holds up in industrial panels without extra clearance. Mechanical life is rated at 10 million switching cycles typical, and contact reliability is specified at 1 faulty switching per 100 million operations at 17 V and 1 mA — useful for PLC-level signals where dry-circuit reliability matters. ## Integration into existing panels The 3RH1911-1FA20-ZW95 snaps onto any SIRIUS size S00 contactor or contactor relay (3RT2, 3RH2 base devices). It occupies no additional DIN-rail width — the block sits on the contactor's front face. Dimensions are 36.5 mm wide, 37.5 mm high, and 41.5 mm deep from the contactor face.","metaTitle":"Siemens 3RH1911-1FA20-ZW95 SIRIUS Auxiliary Switch Block, 2","metaDescription":"Siemens SIRIUS 3RH1911-1FA20-ZW95 auxiliary switch block, 2 NO contacts, rated 10 A max. Phased-out; successor is SIRIUS 3RH2. Sourced to order against RFQ. Snap-on for S00 contact","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RH1","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","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=377886&mlfb=3RH1911-1FA20-ZW95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA20-ZW95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1911-1FA20-ZW95 and get a price?","answer":"This part is sourced through independent distribution channels. Submit an RFQ; availability and current pricing are confirmed at quote time. It is not available new from Siemens, but surplus and new-old-stock units are obtainable."},{"question":"What is the closest functional replacement for 3RH1911-1FA20-ZW95?","answer":"The official successor is the SIRIUS 3RH2 series auxiliary switch block. A specific peer, the 3RH2122-1WB40, is a coupling relay with the same 2 NO + 2 NC contact arrangement, 10 A maximum rating, and screw terminals, but it is a larger device (45 mm wide, 73 mm deep) and mounts on DIN rail rather than snapping onto the contactor face. It will not drop into the same footprint without rewiring the panel layout."},{"question":"What does the note 'with 3RH1' on this component line mean?","answer":"The note indicates this auxiliary switch block is designed to be used with 3RH1 contactor relays and 3RT1 contactors in the SIRIUS S00 frame size. It is not a standalone device; it mounts on the base contactor."},{"question":"Will 3RH1911-1FA20-ZW95 drop into a panel specified around 3RH2122-1WB40?","answer":"No. The 3RH1911-1FA20-ZW95 is a front-mount auxiliary block for S00 contactors (36.5 mm wide, 41.5 mm deep from the contactor face). The 3RH2122-1WB40 is a standalone coupling relay that mounts on DIN rail (45 mm wide, 73 mm deep). The wiring pattern and physical footprint are different; you would need to re-lay out the panel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1FA20-ZW95","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/3RH1911-1FA20-ZW95 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}}