{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1647-1AU01","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1647-1AU01","canonicalUrl":"https://aoctrl.com/siemens/3RT1647-1AU01","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1647-1AU01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1647-1AU01 capacitor contactor, AC-6 duty, 50 kVAr / 400 V, 240 V AC 50 Hz coil, 3-pole, Size S3.","salesMarkdown":"The Siemens 3RT1647-1AU01 is a SIRIUS capacitor contactor built for AC-6 duty, switching capacitor banks up to 50 kVAr at 400 V. That AC-6 rating is what matters here — it's not a general-purpose contactor; it's designed for the high inrush current and repetitive switching of power-factor-correction capacitors. The 240 V AC 50 Hz coil and 3-pole main contacts come in the Size S3 frame, which means it's a physically larger contactor than the S0 or S00 sizes you'd see for motor starting at similar currents. The substance prohibitance date of 05/01/2012 aligns with the transition to RoHS-compliant production — not an obsolescence trigger by itself, but it tells you this part number predates the 3RT2 generation. For a BOM line that's already qualified, the 3RT1647-1AU01 remains a valid spare; the 3RT2 successor will have different dimensions and coil options, so a drop-in swap without panel rework is unlikely. ## What the AC-6 rating means on the panel floor AC-6 duty under IEC 60947-4-1 covers switching of capacitor banks. The 50 kVAr at 400 V figure tells you the maximum reactive power this contactor can handle — pushing it beyond that risks contact welding from the capacitor's charging current. The coil draws 15 W holding power at DC, so if you're running a 240 V AC coil through a control transformer, factor that into the VA budget.","metaTitle":"Siemens 3RT1647-1AU01 Capacitor Contactor, 50 kVAr, 400 V, A","metaDescription":"Siemens SIRIUS 3RT1647-1AU01 capacitor contactor, AC-6 duty rated 50 kVAr at 400 V, 240 V AC coil, 3-pole Size S3. Phased-out product; successor is SIRIUS 3RT2. Available to order","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current","Substance Prohibitance (Date)":"05/01/2012"}},"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=260298&mlfb=3RT1647-1AU01","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1647-1AU01/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1647-1AU01 and get a price?","answer":"This part is sourced to order against an RFQ through our independent distribution network. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What replaces the 3RT1647-1AU01?","answer":"The official successor is the SIRIUS 3RT2 series. The 3RT2 uses a different frame design and coil system, so verify mounting dimensions and control voltage compatibility before substituting."},{"question":"What is the AC-6 rating for?","answer":"AC-6 is the utilization category for switching capacitor banks under IEC 60947-4-1. The 50 kVAr at 400 V rating means this contactor is designed for the high inrush current of power-factor-correction capacitors, not for motor loads."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1647-1AU01","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/3RT1647-1AU01 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}}