{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1NF02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1NF02","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1NF02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1NF02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1911-1NF02 auxiliary switch block, 2 NC contacts, screw-type terminals, size S00, snap-on mounting, IP20 front.","salesMarkdown":"The Siemens 3RH1911-1NF02 is a SIRIUS auxiliary switch block designed for use with contactor relays and power contactors in the size S00 frame. The front face carries IP20 protection, meaning it is finger-safe once installed inside an enclosure. Contact reliability is specified as one incorrect switching operation per 100 million cycles at 17 V and 5 mA — this matters when the block is used to switch low-level electronic signals (e.g., PLC inputs) where oxide films on dry contacts can cause intermittent faults. Mechanical service life is rated at 5 million switching cycles typical, which is the expected endurance before mechanical wear-out under no-load conditions. For buyers with a BOM line locked to the 3RH1911-1NF02 order code, the part is sourced through surplus and broker channels against an RFQ. The successor 3RH2911-1NF02 is the recommended drop-in for new builds or panel retrofits. ## Integration notes The block measures 36.5 mm wide, 37.5 mm high, and 41.5 mm deep — compact enough to fit on a crowded DIN rail alongside the base contactor. Snap-on mounting onto a 35 mm rail per EN 50022 means no tools are needed for installation or removal. Screw terminals accept two conductors per clamp: 0.5 to 1.5 mm² or 0.75 to 2.5 mm² with core-end ferrules, or 20 to 16 AWG and 18 to 14 AWG solid/stranded. This covers most control-circuit wiring in panel builds. The block is rated for use in electronics applications, meaning it is optimized for low-energy switching where contact oxidation is a concern.","metaTitle":"Siemens 3RH1911-1NF02 SIRIUS Auxiliary Switch Block, 2 NC, S","metaDescription":"Siemens 3RH1911-1NF02 auxiliary switch block, 2 NC contacts, screw terminals, size S00. Phased-out, successor 3RH2911-1NF02. Sourced to order.","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","at 24 V":"0.3 A","at 60 V":"0.3 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","Instantaneous Contact":"0","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","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":"5 000 000","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=224643&mlfb=3RH1911-1NF02","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1NF02/alternatives.json"},"ai":{"faq":[{"question":"What replaces the 3RH1911-1NF02?","answer":"The official successor is the SIRIUS 3RH2911-1NF02. It is the preferred replacement and is form-fit-function compatible with the same 2 NC contacts, screw terminals, and S00 size."},{"question":"What are the key ratings of the 3RH1911-1NF02?","answer":"The block provides 2 NC instantaneous contacts, rated insulation voltage 690 V at pollution degree 3, surge voltage resistance 6 kV, mechanical service life 5 million cycles, and contact reliability of 1 faulty switching per 100 million operations at 17 V, 5 mA. It snaps onto a 35 mm DIN rail and measures 36.5 x 37.5 x 41.5 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1NF02","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/3RH1911-1NF02 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}}