{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-1BA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-1BA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-1BA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-1BA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 4EU3921-1BA00-0A commutating choke for converter applications, 3-phase, 750 V AC, 450 A rated current, 0.11 mH, IP00, flat-type terminals.","salesMarkdown":"The Siemens 4EU3921-1BA00-0A is a 3-phase commutating choke for converter applications, rated 750 V AC operating voltage and 450 A continuous current (500 A maximum). Its 0.11 mH inductance limits di/dt and reduces harmonic stress on the converter's semiconductors — a critical component for protecting the drive stage in high-power rectifier or inverter circuits. Power loss splits into 360 W coil loss and 277 W iron-core loss at rated conditions, totalling 637 W. That heat must be managed in the enclosure — the IP00 open-frame design assumes installation in a cabinet with forced airflow or sufficient natural convection, not a sealed box. Thermal class H (180 °C) per IEC 60085 means the insulation system can handle peak hot-spot temperatures up to 180 °C, giving margin for overloads or higher ambient conditions. The 40 °C ambient rating is the baseline; derating applies above that. ## Mounting and connection The main current circuit terminates via flat-type connectors — expect bus-bar or heavy cable lugs, not screw terminals. Physical footprint is 0.41 m wide × 0.385 m high × 0.229 m deep; plan panel layout around those dimensions and the open-frame IP00 mounting. Designed to EN 61558-2-20 (safety of transformers, reactors, and power supply units — particular requirements for small reactors). The choke is rated for 50 Hz operating frequency, 3-phase AC voltage.","metaTitle":"Siemens 4EU3921-1BA00-0A Commutating Choke, 450 A, 750 V","metaDescription":"Siemens 4EU3921-1BA00-0A commutating choke for converters. 3-phase, 450 A rated, 750 V AC, 0.11 mH. IP00, flat connectors. EN 61558-2-20. 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":"500A","Rated Value":"450A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"612.7A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00011H","Power loss [W] of the coil":"360W","Operating voltage rated value":"750V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"277W","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=475325&mlfb=4EU3921-1BA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-1BA00-0A/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 4EU3921-1BA00-0A and how do I get a price?","answer":"Sourced 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 of 4EU3921-1BA00-0A?","answer":"Three-phase, 750 V AC rated voltage, 450 A rated current (500 A maximum), 0.11 mH inductance, 4% relative inductive voltage drop at rated conditions."},{"question":"What is the physical size of 4EU3921-1BA00-0A?","answer":"Width 0.41 m, height 0.385 m, depth 0.229 m. Open-frame IP00 — designed for cabinet mounting with adequate ventilation."},{"question":"What compliance standards does 4EU3921-1BA00-0A meet?","answer":"Designed to EN 61558-2-20, thermal class H per IEC 60085, rated for 50 Hz operation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-1BA00-0A","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/4EU3921-1BA00-0A 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}}