{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1647-1AN21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1647-1AN21","canonicalUrl":"https://aoctrl.com/siemens/3RT1647-1AN21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1647-1AN21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1647-1AN21, capacitor contactor AC-6, 50 kVAr / 400 V, 220 V AC 50/60 Hz, 3-pole Size S3, screw terminals, DIN rail mount.","salesMarkdown":"The 3RT1647-1AN21: The AC-6 rating at 50 kVAr / 400 V is the key figure — it's specifically for switching capacitor banks, where inrush currents can reach tens of times the steady-state value. A standard contactor rated AC-3 or AC-1 at the same apparent power would weld its contacts on the first capacitor energization. The 90 A AC-1 rating at 400 V gives the resistive-load capability for reference. The 220 V AC coil draws from the control transformer, not the capacitor bus. ## Panel Integration Side-by-side mounting is permitted. The 70 mm width matches the S3 frame footprint — fits alongside other SIRIUS S3 contactors and overload relays on the same rail. IP00 on the terminals; IP20 on the front with the supplied cover or box terminal installed. Rated for -25 to +60 °C ambient during operation. The substance prohibitance date of 05/01/2012 indicates RoHS compliance from that point forward.","metaTitle":"Siemens 3RT1647-1AN21 Capacitor Contactor, AC-6 50 kVAr, 220","metaDescription":"Siemens 3RT1647-1AN21 capacitor contactor, AC-6 rated 50 kVAr at 400 V, 220 V AC 50/60 Hz coil, 3-pole Size S3. Phased-out; successor 3RT2636-1AN23. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"183 mm","Width":"70 mm","Height":"167 mm","On The Front":"IP00; IP20 on the front with cover / box terminal","Of The Terminal":"IP00","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","protection class IP":"IP00","at 50 Hz rated value":"220 ... 220 V","at 60 Hz rated value":"220 ... 220 V","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-1 at 400 V rated value":"90 A","Substance Prohibitance (Date)":"05/01/2012","For Auxiliary And Control Circuit":"screw-type terminals","Ambient Temperature During Operation":"-25 ... +60 °C","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"1","Identification Number And Letter For Switching Elements":"1","Supply Voltage Frequency For Auxiliary And Control Circuit Rated Value":"50 ... 60 Hz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$164.77","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=59611&mlfb=3RT1647-1AN21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1647-1AN21/alternatives.json"},"ai":{"faq":[{"question":"What replaces 3RT1647-1AN21?","answer":"The official preferred successor is the SIRIUS 3RT2636-1AN23."},{"question":"Will 3RT1647-1AN21 drop into a panel wired for 3RT1044-1FB46?","answer":"Both are Size S3 contactors with 70 mm width and screw-type main terminals, so the DIN rail footprint and terminal pitch are the same. However, 3RT1044-1FB46 is a DC-coil power contactor (24 V DC) for motor loads, while 3RT1647-1AN21 is an AC-coil capacitor contactor (220 V AC) — the coil voltage and application differ completely. Verify the control circuit voltage and load type before substitution."},{"question":"What is the depth of 3RT1647-1AN21?","answer":"The depth is 183 mm, with a width of 70 mm and height of 167 mm."},{"question":"Where can I buy 3RT1647-1AN21?","answer":"We source this phased-out part to order against an RFQ through independent distribution. Submit a request for current availability and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1647-1AN21","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/3RT1647-1AN21 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}}