{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU4521-4BA00","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU4521-4BA00","canonicalUrl":"https://aoctrl.com/siemens/4EU4521-4BA00","factsUrl":"https://aoctrl.com/api/mcp/products/4EU4521-4BA00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU4521-4BA00 commutating choke (line reactor) for converter applications, 3-phase, 750 V AC, 910 A rated, 46 µH, IP00, screw/flat-type terminals.","salesMarkdown":"## What this choke does in the circuit The Siemens 4EU4521-4BA00 is a three-phase commutating choke (line reactor) designed for the converter side of a drive system. Its job is to limit the rate of rise of current during commutation — that means it snubs the diode-recovery spikes and reduces the harmonic content the converter injects back onto the line. Rated for 910 A continuous at 750 V AC, 50/60 Hz, it carries the full converter input current without saturating. The 910 A continuous rating is the thermal limit at 40 °C ambient; the peak current rating of 1 138 A (125 % of continuous) handles the short-duration overloads common during motor acceleration. Copper losses run 520 W, iron-core losses 404 W — 924 W total heat to vent from the enclosure. Class H insulation (180 °C thermal class per IEC 60085) means the winding can tolerate sustained high temperature without degrading the varnish. The IP00 protection class means it is open-frame — no finger-safe cover, so it must live inside a locked electrical room or an enclosure with a door interlock. ## Termination and approvals Main-circuit connections are screw-type terminals on flat connectors — sized for the 910 A path, so expect large-gauge cable lugs. The choke carries UL/CSA recognition under VDE 0532, which covers the harmonized standard for power reactors. That matters for panel builders who need a cULus mark on the assembly.","metaTitle":"Siemens 4EU4521-4BA00 Commutating Choke, 910 A, 750 V AC, 46","metaDescription":"Siemens 4EU4521-4BA00 commutating choke for converter duty. Rated 910 A at 750 V AC, 46 µH, 50/60 Hz. Class H insulation, 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":"0.293m","Width":"0.46m","Height":"0.435m","Maximum":"910A","Rated Value":"910A","Peak current":"1 138A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"1 115.1A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.000046H","Power loss [W] of the coil":"520W","Operating voltage rated value":"750, 750V","Ambient temperature rated value":"40°C","Operating frequency rated value":"60 ... 50Hz","Power loss [W] of the iron core":"404W","Thermal class acc. to IEC 60085":"H","Type of electrical connection for main current circuit":"flat connector / screw-type terminals","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=128388&mlfb=4EU4521-4BA00","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU4521-4BA00/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU4521-4BA00","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/4EU4521-4BA00 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}}