{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-3BA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-3BA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-3BA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-3BA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 4EU3921-3BA00-0A commutating choke for converters, 3-phase, 400 V AC, 50 Hz, rated current 900 A, peak 1250 A, IP00, flat-type terminals, UL/CSA recognized.","salesMarkdown":"## Commutating Choke for High-Current Converter Lines The Siemens 4EU3921-3BA00-0A is a three-phase commutating choke built for converter duty — it sits on the AC side of a drive or rectifier to limit di/dt and smooth the current waveform during commutation. Rated at 900 A continuous (1000 A maximum) with a peak surge capacity of 1250 A, it handles the kind of sustained load you'd see on a large pump, conveyor, or compressor drive running off 400 V AC, 50 Hz mains. That low impedance is intentional: it provides just enough reactance to protect the converter's thyristors or IGBTs from excessive current rise rates without dropping significant voltage under load. The flat-type terminals (bus-bar style) suit bolted connections to the main power circuit, common in high-current industrial panels. ## Ratings That Matter for the Buyer's Decision The 900 A rated current (1000 A max) and 1250 A peak define the choke's thermal and magnetic headroom. For a 400 V, 50 Hz converter line pulling 900 A continuous, this choke stays within its thermal class H insulation (200 °C rated, per IEC 60085) — meaning it can run hot without cooking the winding. The combined copper and iron losses total 596 W (380 W coil + 216 W iron core), so factor that heat into your cabinet ventilation. The DC rated current of 1225.4 A confirms the choke can also handle DC-side ripple currents in six-pulse rectifier configurations, though the primary rating is AC at 50 Hz. The 4% voltage drop at rated current is typical for commutating chokes in this class — it's enough to limit fault current rise without causing noticeable voltage sag in normal operation.","metaTitle":"Siemens 4EU3921-3BA00-0A Commutating Choke, 900 A, 400 V AC","metaDescription":"Siemens 4EU3921-3BA00-0A commutating choke for converters, 3-phase, 400 V AC, 900 A rated current, 50 Hz, IP00, UL/CSA recognized. Available to order.","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":"1 000A","Rated Value":"900A","Peak current":"1 250A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"1 225.4A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.000022H","Power loss [W] of the coil":"380W","Operating voltage rated value":"400V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"216W","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=485300&mlfb=4EU3921-3BA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-3BA00-0A/alternatives.json"},"ai":{"faq":[{"question":"What are the key current ratings for 4EU3921-3BA00-0A?","answer":"Rated continuous current is 900 A, maximum 1000 A, with a peak surge rating of 1250 A. At DC, the rated value is 1225.4 A. These numbers define the choke's thermal and magnetic capacity for a 400 V, 50 Hz, 3-phase converter line."},{"question":"What compliance documentation does Siemens provide for this choke?","answer":"The datasheet notes UL and CSA recognition under EN 61558-2-20, plus the thermal class H rating per IEC 60085. Standard RoHS and REACH declarations are available from Siemens on request."},{"question":"Where can I buy 4EU3921-3BA00-0A and how is it quoted?","answer":"This commutating choke is sourced and quoted to order through independent distribution channels. Submit an RFQ for current pricing and availability — lead times and stock are confirmed at quote time, not guaranteed on a shelf."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-3BA00-0A","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/4EU3921-3BA00-0A 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}}