{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0CA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0CA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0CA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0CA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-0CA00-0A commutating choke for converter, 3-phase, 690V AC, 630A max, 567A rated, 50Hz, IP00, flat-type terminals.","salesMarkdown":"The Siemens 4EU3921-0CA00-0A is a 3-phase commutating choke designed for converter applications, rated at 690 V AC and 50 Hz. It handles a maximum continuous current of 630 A, with a rated current of 567 A and a peak current capacity of 788 A. ## Sizing and thermal class Rated for a 40 °C ambient, the choke carries thermal class H per IEC 60085, meaning the winding insulation withstands a 180 °C hot-spot temperature — critical for sustained high-current duty in a converter cabinet where airflow may be restricted. Total power loss splits between the coil (388 W) and the iron core (176 W), so the enclosure around this choke needs to vent that 564 W of heat; a sealed panel without forced ventilation will bake the surrounding components. ## Physical integration Dimensions are 0.41 m wide by 0.385 m tall by 0.229 m deep — a substantial component that needs a dedicated mounting footprint inside the converter cabinet. Main circuit connections are flat-type terminals, so the mating busbars or cable lugs must be flat-pattern compatible; no screw-clamp or ring-tongue terminals fit directly. The 0.0605 mH inductance (60.5 µH) is the value that sets the commutation notch; verify it matches the converter's design inductance requirement before substituting.","metaTitle":"Siemens 4EU3921-0CA00-0A Commutating Choke, 630A, 690V, 3-Ph","metaDescription":"Siemens 4EU3921-0CA00-0A commutating choke for converters. Rated 567A, max 630A, 690V AC, 3-phase, 50Hz. IP00, thermal class H. Mature lifecycle, available to order.","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":"630A","Rated Value":"567A","Peak current":"788A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"772A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00006H","Power loss [W] of the coil":"388W","Operating voltage rated value":"690V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"176W","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=50120&mlfb=4EU3921-0CA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0CA00-0A/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 4EU3921-0CA00-0A and 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 electrical ratings for 4EU3921-0CA00-0A?","answer":"Rated voltage 690 V AC, rated current 567 A, maximum current 630 A, peak current 788 A, operating frequency 50 Hz, 3-phase, inductance 0.0605 mH, relative inductive voltage drop 4 %."},{"question":"What is the physical size of 4EU3921-0CA00-0A?","answer":"Width 0.41 m, height 0.385 m, depth 0.229 m. Main circuit connections are flat-type terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0CA00-0A","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/4EU3921-0CA00-0A 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}}