{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0BC00-1B","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0BC00-1B","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0BC00-1B","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BC00-1B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-0BC00-1B commutating choke for converter, 3-phase, 400V AC, 495A rated current, 550A max, 0.08mH, IP00, flat-type terminal, UL/CSA recognized.","salesMarkdown":"The Siemens 4EU3921-0BC00-1B is a three-phase commutating choke (line reactor) designed for converter applications. It limits the rate of rise of current (di/dt) and reduces harmonic distortion on the line side of a variable-frequency drive or DC drive converter. Rated at 495 A continuous with a 550 A maximum at 50 Hz, it handles the full-load current of a substantial drive system — think 250–300 kW motor loads on 400 V AC three-phase. The 0.08 mH inductance (80 µH) and 6.4% relative inductive voltage drop (uk) are sized for typical drive input filtering. The 550 W coil loss and 170 W iron core loss at rated load tell you the thermal budget: this is a 720 W total dissipation component that needs free air or forced ventilation — IP00 means no enclosure, so it mounts inside a cabinet with clearance for airflow. That 550 A maximum (Ithmax) is the short-time thermal withstand — not a continuous rating. For a drive with a 400 A output rating, this choke gives headroom; for a 500 A drive, you are at the limit and should verify the drive's input current profile. The 674 A DC rated value means this choke can also sit on the DC link of a converter, not just the AC line side. That is unusual for a commutating choke — most are AC-only. If you are retrofitting a DC drive bus, this single component covers both roles. Flat-type terminals (bus-bar style) on the main circuit mean you are landing lugged cable or bus bar, not wire ferrules. Plan for M8 or M10 bolt-down connections rated for 500 A class. The 0.229 m depth, 0.41 m width, and 0.385 m height define the cabinet footprint — allow 50 mm clearance on all sides for airflow and terminal access.","metaTitle":"4EU3921-0BC00-1B Commutating Choke, 495A, 400V AC, 3-Phase","metaDescription":"Siemens 4EU3921-0BC00-1B commutating choke for converters. 495A rated, 550A max, 400V AC, 3-phase, IP00. UL/CSA recognized. 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":"550A","Rated Value":"495A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"674A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00008H","Power loss [W] of the coil":"550W","Operating voltage rated value":"400V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"170W","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":"0%"}},"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=353552&mlfb=4EU3921-0BC00-1B","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BC00-1B/alternatives.json"},"ai":{"faq":[{"question":"Will 4EU3921-0BC00-1B drop into a panel designed for a motor-protective circuit breaker like 3RV6011-0CA10?","answer":"No — this is a 495 A commutating choke measuring 0.41 m wide by 0.385 m tall by 0.229 m deep, with flat-type bus-bar terminals. A 3RV6011-0CA10 is a 0.25 A DIN-rail mounted motor-protective circuit breaker. They serve completely different functions and footprints; no direct substitution is possible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0BC00-1B","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/4EU3921-0BC00-1B 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}}