{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1FA40-ZW95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1FA40-ZW95","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1FA40-ZW95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA40-ZW95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1911-1FA40-ZW95, 4 NO contacts, 10 A rated, screw terminals, snap-on mounting, IP20 front protection.","salesMarkdown":"It snaps onto the contactor via the standard mounting interface — no tools needed for installation, but verify the latch is fully engaged before energizing. The screw-type terminals on this block accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) conductors with core end processing, or 2x (20 to 16) and 2x (18 to 14) AWG for auxiliary wiring. That matters when the auxiliary contact feeds a PLC input or a safety relay: you want it to close every time, not just most times. Snap-on mounting onto the contactor. The block measures 36.5 mm wide, 37.5 mm high, and 41.5 mm deep. IP20 on the front protects against finger contact. ## Contact ratings across voltages The maximum continuous current is 10 A, but the switching capacity varies significantly with voltage. At 24 V DC the block is rated for 6 A, dropping to 0.3 A at 220 V DC. For AC loads at 230 V it handles 6 A, and at 400 V it is rated for 3 A. At AC-15 duty (inductive loads typical for contactor coils and solenoid valves) at 690 V it is rated for 1 A. Always verify the switching current at your specific operating voltage — the 10 A maximum is only achievable at low voltages.","metaTitle":"Siemens 3RH1911-1FA40-ZW95 Auxiliary Switch Block, 4 NO, 10","metaDescription":"Siemens SIRIUS auxiliary switch block 3RH1911-1FA40-ZW95, 4 NO contacts, 10 A rated, IP20 front, snap-on mounting. Phased-out; successor is 3RH2 series. Quoted to order.","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":"4","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=132940&mlfb=3RH1911-1FA40-ZW95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA40-ZW95/alternatives.json"},"ai":{"faq":[{"question":"What replaces 3RH1911-1FA40-ZW95?","answer":"The official successor is the SIRIUS 3RH2 series. The 3RH2140-1BP40 is a direct functional replacement with the same 4 NO contact configuration and similar ratings, but in a larger S00-size housing with screw and snap-on mounting onto 35 mm DIN rail. It is physically larger (73 mm deep, 45 mm wide) so it will not drop into the same panel footprint without rewiring and re-spacing."},{"question":"Where can I buy 3RH1911-1FA40-ZW95?","answer":"This phased-out part is sourced through independent distribution channels. Submit an RFQ for current availability and pricing — stock is intermittent and confirmed at quote time."},{"question":"Will 3RH1911-1FA40-ZW95 drop into a panel designed for 3RH2140-1BP40?","answer":"No. The 3RH1911-1FA40-ZW95 is a smaller block (36.5 mm wide, 41.5 mm deep) that snaps directly onto SIRIUS contactors. The 3RH2140-1BP40 is physically larger (45 mm wide, 73 mm deep) and mounts onto 35 mm DIN rail. They are not footprint-compatible without panel rework."},{"question":"What is the contact reliability of this auxiliary switch block?","answer":"Rated at one faulty switching per 100 million operations at 17 V, 1 mA. This is a very high reliability rating for low-energy signal circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1FA40-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/3RH1911-1FA40-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}}