{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1NF20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1NF20","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1NF20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1NF20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1911-1NF20 auxiliary switch block, 2 NO contacts, screw terminals, size S00, snap-on mounting, IP20, 690 V insulation voltage.","salesMarkdown":"It provides 2 normally open (NO) instantaneous contacts, wired via screw-type terminals. The 41.5 mm depth, 36.5 mm width, and 37.5 mm height keep it compact for tight enclosures. The auxiliary contacts are rated at 0.3 A at both 24 V and 60 V — this is a low-current, signal-level rating intended for PLC inputs, contactor coils, or indicator lamps, not for power switching. Mechanical service life of 5 million operating cycles is typical for this class of auxiliary block in a contactor application, matching the expected life of the base contactor in moderate-duty cycling. This part is flagged as a phased-out product. The official Siemens successor is the SIRIUS 3RH2911-1NF20, which is the preferred replacement. The successor shares the same S00 footprint, 2 NO contact arrangement, and screw terminal connection, so a panel designed for the 3RH1911 can typically accept the 3RH2911 without rewiring, but verify the mounting rail and wiring space match. ## Wiring and terminal details Screw-type terminals accept 2 conductors per clamp: 0.5 to 1.5 mm² or 0.75 to 2.5 mm² with core end processing, or 20 to 16 AWG and 18 to 14 AWG respectively. This covers standard control wiring for auxiliary circuits.","metaTitle":"Siemens 3RH1911-1NF20 SIRIUS Auxiliary Switch Block, 2 NO, S","metaDescription":"Siemens SIRIUS 3RH1911-1NF20 auxiliary switch block, 2 NO contacts, snap-on for S00 contactors. Screw terminals, IP20, 690 V insulation. Phased-out; successor 3RH2911-1NF20. Source","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","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","Instantaneous Contact":"2","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 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 (Operating Cycles) Typical":"5 000 000","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=232745&mlfb=3RH1911-1NF20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1NF20/alternatives.json"},"ai":{"faq":[{"question":"What replaces the 3RH1911-1NF20?","answer":"The preferred successor is the Siemens SIRIUS 3RH2911-1NF20. It is the same S00 size auxiliary switch block with 2 NO contacts and screw terminals, designed to drop into the same panel footprint."},{"question":"What are the key ratings of the 3RH1911-1NF20?","answer":"It provides 2 NO auxiliary contacts rated at 0.3 A at 24 V and 60 V. Insulation voltage is 690 V at pollution degree 3, surge resistance is 6 kV, and mechanical life is 5 million cycles. It mounts via snap-on to a DIN rail and uses screw terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1NF20","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/3RH1911-1NF20 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}}