{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1FA20-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1FA20-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1FA20-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA20-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1911-1FA20-ZX95, 2 NO contacts, 10 A, screw terminals, snap-on mounting, IP20 front, size S00.","salesMarkdown":"It snaps onto the front of the base device, giving you extra signaling or interlocking without additional wiring space on the rail. Rated for a maximum of 10 A, with contact reliability specified at one incorrect switching operation per 100 million cycles at 17 V and 5 mA — meaning it handles both power-level pilot duty and low-level logic signals without nuisance failures. The 2 NO contacts are rated across multiple voltage levels: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, and 3 A at 400 V. These are the AC-15 / utilization-category figures that govern inductive pilot-duty loads like contactor coils and solenoid valves. The 0.3 A rating at 220 V and 1.2 A at 220 V (two separate entries) reflect different duty curves — the lower figure likely applies to DC switching, the higher to AC. For DC loads, the 24 V rating of 10 A and the 60 V rating of 4.7 A give you the practical break capacity. The block is IP20 on the front. Snap-on mounting onto the contactor front, no DIN rail space consumed. Screw-type 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. The block dimensions are 36.5 mm wide, 37.5 mm high, and 41.5 mm deep — it adds minimal projection beyond the contactor face.","metaTitle":"Siemens 3RH1911-1FA20-ZX95 Auxiliary Switch Block, 2 NO, IP2","metaDescription":"Siemens SIRIUS 3RH1911-1FA20-ZX95 auxiliary switch block, 2 NO contacts, 10 A max, IP20 front, snap-on mounting. Phased-out; successor is 3RH2. Sourced 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","Mounting type":"snap-on mounting","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Product brand name":"SIRIUS","Contact reliability":"one incorrect switching operation of 100 million switching operations (17 V, 5 mA)","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 conductors 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","Insulation voltage with degree of pollution 3 rated value":"690 V","Type of electrical connection for auxiliary and control current circuit":"screw-type terminals"}},"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=394972&mlfb=3RH1911-1FA20-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA20-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 3RH1911-1FA20-ZX95?","answer":"The closest functional peer within the same SIRIUS family is the 3RT1015-1BB42 power contactor, which shares the S00 frame size, 10 A rating at 24 V, and IP20 front protection. However, the 3RT1015-1BB42 is a complete power contactor with 3 main poles, not just an auxiliary block — it cannot be used as a drop-in replacement for the 3RH1911-1FA20-ZX95 without rewiring the main circuit. The true replacement is the 3RH2 series auxiliary block."},{"question":"What does the note 'with 3RH1' mean on this component?","answer":"It indicates the auxiliary switch block is designed to mount on 3RH1 contactor relays and 3RT1 power contactors in the S00 frame size. It is not a standalone device."},{"question":"What is the depth of the 3RH1911-1FA20-ZX95?","answer":"41.5 mm. The width is 36.5 mm and height is 37.5 mm."},{"question":"Can the 3RH1911-1FA20-ZX95 drop into a panel specified around the 3RT1015-1BB42?","answer":"Yes, for the auxiliary contacts. The 3RH1911-1FA20-ZX95 snaps onto the front of a 3RT1015-1BB42 contactor and adds 2 NO auxiliary contacts without rewiring the main power circuit. The mounting interface and terminal layout are compatible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1FA20-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/3RH1911-1FA20-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}}