{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU4321-0ED00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU4321-0ED00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU4321-0ED00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU4321-0ED00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS Netzdrossel f. FU mains choke, 3-phase, 400V AC, 50Hz, 459A rated / 510A max, 0.115mH, 8% voltage drop, IP00, flat-type terminals.","salesMarkdown":"The Siemens 4EU4321-0ED00-0A is a three-phase mains choke (line reactor) for variable-frequency drive input circuits, designated Netzdrossel f. FU. It sits between the supply and the drive rectifier to smooth current draw, limit harmonic distortion, and reduce voltage notching that couples back onto the line. The 459 A rated current and 510 A maximum tell you this choke is sized for a drive with a nominal input current in that range — think a large motor drive, not a small servo. The 8 % voltage drop is the key number for sizing: if the drive requires full bus voltage under load, a choke with a lower drop percentage may be needed, but 8 % is standard for most industrial VFD applications where harmonic compliance (IEEE 519) is the goal. The flat-type terminals accept busbar or large cable lugs, not spring-clamp or screw terminals. Thermal class H per IEC 60085 means the insulation system withstands 180 °C continuous, so it handles the heat rise from high continuous current without derating prematurely. Mounts on the panel floor or a subplate — no DIN rail, no snap-on. At 0.46 m wide × 0.435 m tall × 0.265 m deep, it needs a clear footprint and airflow around it; don't bury it against other heat sources. The flat-type terminals mean the main power cables land with bolted lugs, so plan for tool access and bending radius.","metaTitle":"Siemens 4EU4321-0ED00-0A Mains Choke, 459A, 400V, 50Hz","metaDescription":"Siemens 4EU4321-0ED00-0A mains choke for VFD input. Rated 459A / 510A max, 400V AC, 50Hz, 0.115mH, IP00. Mature lifecycle. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.265m","Width":"0.46m","Height":"0.435m","Maximum":"510A","Rated Value":"459A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","Product designation":"Netzdrossel f. FU","Protection class IP":"IP00","Inductivity rated value":"0.00012H","Operating voltage rated value":"400V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Thermal class acc. to IEC 60085":"H","Type of electrical connection for main current circuit":"flat connector","Relative inductive drop in voltage on the measurement level current, voltage and frequency":"8%"}},"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=389551&mlfb=4EU4321-0ED00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU4321-0ED00-0A/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 4EU4321-0ED00-0A and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What are the key ratings for 4EU4321-0ED00-0A?","answer":"Three-phase, 400 V AC, 50 Hz, 459 A rated current / 510 A maximum, 0.115 mH inductance, 8 % voltage drop, IP00, thermal class H insulation."},{"question":"Will 4EU4321-0ED00-0A drop into a panel specified around 3RV6011-0CA10 without rewiring?","answer":"No. The 3RV6011-0CA10 is a DIN-rail-mounted motor-protective circuit breaker (S00 frame, 0.25 A), while this is a floor-mount mains choke (459 A). They serve completely different functions and footprints — no direct interchange."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU4321-0ED00-0A","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/4EU4321-0ED00-0A 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}}