{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-7BA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-7BA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-7BA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-7BA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-7BA00-0A commutating choke for converter, 3-phase, 500V AC, 800A at 50Hz, 35µH, IP00, flat-type terminal, thermal class H.","salesMarkdown":"The Siemens 4EU3921-7BA00-0A is a three-phase commutating choke — a line reactor — for converter applications. It limits current rise and reduces harmonic distortion on the AC side of a variable-speed drive or rectifier. Rated for 500 V AC at 50 Hz, it carries 800 A continuous AC current (720 A operational) and peaks at 1 000 A. The 35 µH inductance with a 4 % relative inductive voltage drop defines the smoothing and commutation notch filtering it provides. The 800 A AC maximum current at 50 Hz sets the thermal limit for continuous operation. The 720 A operational AC current is the design point for voltage drop calculations — use that for sizing the cable and upstream protection. The 4 % impedance is standard for drive input reactors; it keeps DC bus ripple and line notching within typical drive manufacturer limits. Power loss splits into 375 W copper loss and 230 W iron loss, totaling 605 W at rated load. That heat must be managed — the IP00 enclosure means no fan or filter; the choke relies on natural convection in the cabinet. Thermal class H (180 °C) insulation gives headroom for high ambient temperatures up to the 40 °C rated ambient. ## Physical integration and connection Dimensions: 0.385 m high, 0.41 m wide, 0.229 m deep. That footprint is substantial — plan for a dedicated mounting plate or sub-panel in the cabinet, not DIN-rail. Main circuit connection is via flat-type terminals, typical for busbar or large cable lugs. Verify busbar hole pattern and lug width against the terminal dimensions before ordering. The 4EU3921-7BA00-0A carries an active product status. It is recognized under UL/CSA per EN 61558-2-20.","metaTitle":"Siemens 4EU3921-7BA00-0A Commutating Choke, 800A AC, 500V, 5","metaDescription":"Siemens 4EU3921-7BA00-0A commutating choke for converter applications. 3-phase, 800A AC, 500V, 50Hz, 35µH, IP00. Active, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.229m","Width":"0.41m","Height":"0.385m","Peak Current":"1 000A","Phase Number":"3","Type Of Voltage":"AC","lifecycle_stage":"mature","Product Designation":"Kommut.-Drossel f. Stromrichter","protection class IP":"IP00","current at AC maximum":"800A","Inductivity Rated Value":"0.000035H","current at DC rated value":"980.3A","power loss [W] of the coil":"375W","Operating Voltage Rated Value":"500V","Ambient Temperature Rated Value":"40°C","Operating Frequency Rated Value":"50Hz","power loss [W] of the iron core":"230W","thermal class acc. to IEC 60085":"H","operational current at AC rated value":"720A","Type Of Electrical Connection For Main Current Circuit":"flat connector","Relative Inductive Drop In Voltage For Rated Value Of The 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=41155&mlfb=4EU3921-7BA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-7BA00-0A/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 4EU3921-7BA00-0A and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"What are the key specifications of 4EU3921-7BA00-0A?","answer":"Three-phase commutating choke, 500 V AC, 50 Hz, 800 A AC max (720 A operational), 35 µH, 4 % voltage drop, IP00, thermal class H, flat-type terminals."},{"question":"What is the physical size of 4EU3921-7BA00-0A?","answer":"Height 0.385 m, width 0.41 m, depth 0.229 m. It requires a dedicated mounting plate, not DIN-rail."},{"question":"What compliance documentation is available for 4EU3921-7BA00-0A?","answer":"The choke is recognized under UL/CSA and designed per EN 61558-2-20. Standard RoHS and REACH declarations are available from Siemens documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-7BA00-0A","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/4EU3921-7BA00-0A 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}}