{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0BA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0BA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0BA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-0BA00-0A commutating choke (line reactor) for converter applications, 3-phase, 405A rated / 450A max, 750V AC, 0.12 mH, IP00, flat-type terminals.","salesMarkdown":"Rated 405 A continuous with a 450 A maximum thermal current at 750 V AC, 50 Hz, it carries a 0.12 mH inductance and a 4 % relative inductive voltage drop at rated conditions. The 405 A rated current (I_LN) and 450 A maximum thermal current (I_thmax) define the continuous load envelope — this choke can carry a 405 A fundamental current indefinitely at 40 °C ambient, with headroom to 450 A for overloads that stay within the thermal time constant. The 750 V AC operating voltage covers 400 V, 480 V, and 690 V line-to-line systems common in European and North American industrial drives. The 0.12 mH inductance and 4 % voltage drop (at rated current and frequency) are the values the drive manufacturer expects to see for proper DC-link ripple filtering and commutation notch suppression; swapping in a choke with a different inductance shifts the notch frequency and may increase peak voltages across the rectifier diodes. The IP00 rating means the choke is an open-frame component — no enclosure, no finger-safe protection. The thermal class H (IEC 60085) insulation system allows a 180 °C hot-spot temperature, which is standard for converter-duty chokes that see both fundamental current and switching-frequency harmonics. The flat-type terminals accept busbar or large cable lugs; plan for a bolted connection, not spring-clamp or screw-cage wiring.","metaTitle":"Siemens 4EU3921-0BA00-0A Commutating Choke, 405A, 750V AC","metaDescription":"Siemens 4EU3921-0BA00-0A 3-phase commutating choke for converters. Rated 405A / 450A max at 750V AC, 0.12mH, IP00. 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":"450A","Rated Value":"405A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"551.4A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00012H","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=40286&mlfb=4EU3921-0BA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BA00-0A/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0BA00-0A","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/4EU3921-0BA00-0A 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}}