{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0BV10-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0BV10-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0BV10-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BV10-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 4EU3921-0BV10-0A commutating choke for converter, 3-phase, 720 A rated current, 800 A max, 400 V AC, 50 Hz, IP00, flat-type terminal.","salesMarkdown":"The Siemens 4EU3921-0BV10-0A is a commutating choke (line reactor) for converter applications, designed to limit current rise rates and reduce harmonic distortion on the AC input side of a variable-frequency drive or DC drive. The 36 µH inductance (0.000036 H) and 3.88 % relative inductive voltage drop define the choke's impedance at rated conditions; this voltage drop is the design parameter that determines how much line-side filtering the choke provides. Higher impedance chokes suppress more harmonics but drop more voltage under load — this one sits in the moderate range, balancing filtering with voltage headroom for the drive's DC bus. ## Thermal and mechanical constraints Total power loss at rated load is 568 W — 326 W in the coil and 242 W in the iron core — all dissipated as heat inside the enclosure. Thermal class H (180 °C insulation system per IEC 60085) gives headroom for hot-spot temperatures, but the 40 °C ambient limit governs the installation: derate or increase airflow if the panel ambient exceeds that. Dimensions are 0.41 m wide × 0.385 m high × 0.229 m deep — a substantial component that needs a dedicated mounting footprint. The main circuit connects via flat-type terminals (bus-bar or heavy-gauge cable lugs), not screw-clamp or spring-cage; plan for bolted connections with appropriate torque and creepage distances for 400 V AC.","metaTitle":"Siemens 4EU3921-0BV10-0A Commutating Choke, 720A, 400V AC","metaDescription":"Siemens 4EU3921-0BV10-0A commutating choke for converter, 3-phase, 720A rated, 800A max, 400V AC, 50Hz, IP00, flat connector. 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":"800A","Rated Value":"720A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.000036H","Power loss [W] of the coil":"326W","Operating voltage rated value":"400V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"242W","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":"3.88%"}},"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=22718&mlfb=4EU3921-0BV10-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BV10-0A/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for 4EU3921-0BV10-0A?","answer":"Rated current 720 A, maximum current 800 A, inductance 36 µH, voltage drop 3.88 %, operating voltage 400 V AC at 50 Hz, three-phase. Total power loss 568 W at rated load."},{"question":"Where can I buy 4EU3921-0BV10-0A?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0BV10-0A","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/4EU3921-0BV10-0A 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}}