{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-2FA31-0MC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-2FA31-0MC0","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-2FA31-0MC0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-2FA31-0MC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1911-2FA31-0MC0, 3 NO + 1 NC, spring-loaded terminals, 10 A rated, snap-on for 3RT101..-.K...-0LA0 contactors.","salesMarkdown":"The Siemens 3RH1911-2FA31-0MC0 is a front-mounted auxiliary switch block from the SIRIUS family, designed to snap onto 3RT101..-.K...-0LA0 power contactors. It provides 3 normally-open and 1 normally-closed instantaneous contacts — labelled 53/54, 61/62, 73/74 (NO) and 83/84 (NC) — giving you four auxiliary signal paths off a single contactor. Rated for 10 A maximum, the switching capacity varies by voltage: 6 A at 24 V, 230 V, and 250 V; 3 A at 400 V; 2 A at 60 V; 1 A at 110 V; and 0.3 A at 220 V. For AC-15 duty at 690 V it's rated 1 A, and the DC ratings follow a similar derating curve — 10 A at 24 V DC, stepping down to 0.26 A at 600 V DC. The 6 kV surge voltage resistance and 690 V insulation voltage at pollution degree 3 mean this block is built for industrial control panels where transient isolation between circuits matters. Snap-on mounting onto the contactor front — no DIN rail footprint consumed beyond the base contactor itself. The block measures 46 mm deep, 36.5 mm wide, and 37.5 mm tall, adding minimal projection beyond the contactor face. Spring-loaded terminals accept 2x (0.5... 1.5 mm²) with core-end processing or 2x (0.5... 2.5 mm²) without; AWG equivalents are 2x (20... 14). Mechanical life is rated at 10 million switching cycles typical, with contact reliability of 1 faulty switching per 100 million operations at 17 V, 1 mA — a figure that matters when you're using the NC contact for a safety feedback path that must be fail-safe.","metaTitle":"Siemens 3RH1911-2FA31-0MC0 SIRIUS Auxiliary Switch, 3NO+1NC,","metaDescription":"Siemens SIRIUS 3RH1911-2FA31-0MC0 auxiliary switch block, 3 NO + 1 NC contacts, rated 10 A, spring-loaded terminals. Snap-on mounting for 3RT101..-.K...-0LA0 contactors. Current pr","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"46 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":"3","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Without Core End Processing":"2x (0.5 ... 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 ... 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":"spring-loaded 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":"https://cdn.aoctrl.com/8529d61733d3bbbc74deaf711bc7496a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1458567&mlfb=3RH1911-2FA31-0MC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-2FA31-0MC0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — the 3RH2422-1AB00?","answer":"The 3RH2422-1AB00 is a different form factor: it is a standalone auxiliary contactor (size S00) with screw terminals, 2 NO + 2 NC, and mounts on DIN rail, not onto a power contactor front. It will not drop into a panel wired for the 3RH1911-2FA31-0MC0 without rewiring and re-spacing. The 3RH1911-2FA31-0MC0 is a front-mount add-on block; the 3RH2422-1AB00 is a separate device."},{"question":"What are the key switching ratings?","answer":"Maximum 10 A. AC switching: 6 A at 24 V, 230 V, 250 V; 3 A at 400 V; 2 A at 60 V; 1 A at 110 V; 0.3 A at 220 V. DC switching: 10 A at 24 V; 4.7 A at 60 V; 3 A at 110 V; 1.2 A at 220 V; 0.5 A at 440 V; 0.26 A at 600 V. AC-15 at 690 V: 1 A."},{"question":"What compliance documentation is available?","answer":"The SIRIUS series carries CE, UL, CSA, and CCC certifications as standard. RoHS and REACH compliance is declared per Siemens environmental directives. Specific declaration numbers are available on the manufacturer's support portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-2FA31-0MC0","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/3RH1911-2FA31-0MC0 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}}