{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0BD00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0BD00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0BD00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BD00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-0BD00-0A commutating choke for converter, 3-phase, 400V AC, 450A rated current, 500A max, 50Hz, IP00, flat-type terminals.","salesMarkdown":"It is rated for a continuous current of 450 A, with a maximum of 500 A, and provides an inductance of 0.082 mH (82 µH) with a relative inductive voltage drop of 6% at the rated operating point. This choke limits the rate of rise of current (di/dt) and reduces harmonic distortion on the line side of the drive, protecting both the converter and upstream equipment. The 450 A rated current (500 A maximum) is the continuous thermal current the choke can carry at its rated ambient temperature of 40 °C. For a 400 V, 50 Hz drive, this choke is sized for a motor load roughly in the 250–300 kW range, depending on the drive's input current draw. The 6% voltage drop is a standard impedance for commutating chokes — it provides effective harmonic mitigation without excessive voltage drop under load. The DC-rated current of 612.7 A is also listed, indicating the choke can handle a higher current in DC applications, but the primary rating is for AC three-phase use. Power loss is split between the coil (543 W) and the iron core (186 W), totaling about 729 W at full load. This heat must be dissipated; the IP00 enclosure means the choke is not sealed — it relies on natural or forced air circulation in the cabinet. Mounting in a well-ventilated area or with a dedicated fan is recommended, especially if the ambient cabinet temperature approaches 40 °C. ## Physical integration and connection The choke measures 0.41 m wide, 0.385 m high, and 0.229 m deep — a substantial component that requires a dedicated mounting footprint in the panel. The main current circuit uses flat-type connectors (busbar or large cable lugs), not screw terminals, so plan for bolted connections with appropriate torque. The IP00 protection class means the choke has no enclosure; it must be installed inside a cabinet that provides the required environmental protection for the overall assembly.","metaTitle":"Siemens 4EU3921-0BD00-0A Commutating Choke, 450A, 400V, 50Hz","metaDescription":"Siemens 4EU3921-0BD00-0A commutating choke for converter, 3-phase, 400V AC, 450A rated, 500A max, 50Hz, IP00, flat-type terminals. Sourced 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":"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":"0.000082H","Power loss [W] of the coil":"543W","Operating voltage rated value":"400V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"186W","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":"6%"}},"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=526605&mlfb=4EU3921-0BD00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BD00-0A/alternatives.json"},"ai":{"faq":[{"question":"What are the key electrical ratings of 4EU3921-0BD00-0A?","answer":"It is a three-phase commutating choke rated for 400 V AC, 50 Hz, with a continuous current of 450 A (500 A maximum), an inductance of 0.082 mH, and a 6% voltage drop."},{"question":"Where can I buy 4EU3921-0BD00-0A?","answer":"This part is sourced to order against an RFQ through our independent distribution network. Availability and current pricing are confirmed at the time of quote."},{"question":"What is the physical size of 4EU3921-0BD00-0A?","answer":"It measures 0.41 m wide, 0.385 m high, and 0.229 m deep."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0BD00-0A","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/4EU3921-0BD00-0A 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}}