{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-1CA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-1CA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-1CA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-1CA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-1CA00-0A commutating choke for converter, 3-phase, 750 V AC rated voltage, 450 A rated current, 87 µH inductance, 4% relative inductive voltage drop, IP00, thermal class H, flat-type terminals.","salesMarkdown":"The Siemens 4EU3921-1CA00-0A is a three-phase commutating choke (line reactor) designed for use with converter drives. It sits between the converter and the supply — or on the DC link — to limit current rise rates, reduce harmonics, and protect the converter's semiconductor switches from commutation notches. Rated for 450 A continuous (500 A maximum) with a peak current capability of 625 A, it handles the full rated load of a large drive without saturating. The 87 µH inductance (0.000087 H) at 50 Hz produces a 4% relative inductive voltage drop at rated current and voltage — a standard impedance level that coordinates with most six-pulse converter front ends without excessive voltage loss. The 750 V AC rated operating voltage covers 400 V, 480 V, and 690 V class drives with headroom. ## Thermal and mounting constraints This is an IP00 open-frame component — no enclosure, no finger-safe guarding. Total power dissipation is roughly 600 W (380 W coil loss plus 218 W iron-core loss) at full load, so forced-air ventilation or a properly sized cabinet is necessary to stay within the 40 °C rated ambient temperature. Thermal class H per IEC 60085 means the insulation system is rated for 180 °C hot-spot temperature — suitable for the high thermal stress inside a converter cabinet where ambient temperatures can climb. Main current connections use flat-type terminals (busbar or bolted lug), not screw-clamp or spring-cage; plan for busbar routing or crimp lugs with the correct hole pattern. Physical footprint: 0.41 m wide × 0.385 m high × 0.229 m deep.","metaTitle":"Siemens 4EU3921-1CA00-0A Commutating Choke, 450 A, 750 V, 87","metaDescription":"Siemens 4EU3921-1CA00-0A commutating choke for 3-phase converters. Rated 450 A / 750 V AC, 87 µH, 4% voltage drop. IP00, thermal class H. Sourced to order — request quote.","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","Peak current":"625A","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":"0.000087H","Power loss [W] of the coil":"380W","Operating voltage rated value":"750V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"218W","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=247803&mlfb=4EU3921-1CA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-1CA00-0A/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-1CA00-0A","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/4EU3921-1CA00-0A 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}}