{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-8AA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-8AA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-8AA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-8AA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-8AA00-0A commutating choke for converter applications, 3-phase, 750V AC, 360A rated / 400A max, 0.14 mH, IP00, flat-type terminals.","salesMarkdown":"The Siemens 4EU3921-8AA00-0A is a commutating choke (line reactor) for converter duty — three-phase, 750 V AC, rated 360 A continuous with a 400 A maximum. The 0.14 mH inductance limits di/dt and smooths the current waveform on the AC side of a variable-speed drive or rectifier. ## Thermal and enclosure reality IP00 means no enclosure — this is a panel-mount component that needs a cabinet with proper ventilation or forced air. Total power loss at rated load is 682 W (394 W in the coil, 288 W in the iron core), so the heat load is real. Rated ambient is 40 °C with thermal class H insulation (180 °C hot-spot limit per IEC 60085), which gives headroom for the self-heating. The 0.229 m depth, 0.41 m width, and 0.385 m height footprint means it takes up a fair chunk of panel floor — plan the layout around the flat-type bus-bar connections rather than cable lugs.","metaTitle":"Siemens 4EU3921-8AA00-0A Commutating Choke, 360A, 750V, 3-Ph","metaDescription":"Siemens 4EU3921-8AA00-0A commutating choke for converters. 360A rated, 400A max, 750V AC, 3-phase, 0.14 mH. IP00, flat connectors. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.229m","Width":"0.41m","Height":"0.385m","Maximum":"400A","Rated Value":"360A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"490.1A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00014H","Power loss [W] of the coil":"394W","Operating voltage rated value":"750V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"288W","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":"4%"}},"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=177383&mlfb=4EU3921-8AA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-8AA00-0A/alternatives.json"},"ai":{"faq":[{"question":"What are the key electrical ratings for 4EU3921-8AA00-0A?","answer":"Three-phase, 750 V AC, 360 A rated continuous current, 400 A maximum. Inductance is 0.14 mH with a 4% relative inductive voltage drop at rated current. DC-rated current is 490.1 A."},{"question":"Where can I buy 4EU3921-8AA00-0A?","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 quote."},{"question":"What are the physical dimensions of 4EU3921-8AA00-0A?","answer":"Depth 0.229 m, width 0.41 m, height 0.385 m. The enclosure rating is IP00, so it requires a cabinet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-8AA00-0A","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/4EU3921-8AA00-0A 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}}