{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU4321-0BM10-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU4321-0BM10-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU4321-0BM10-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU4321-0BM10-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU4321-0BM10-0A commutating choke for converter, 3-phase, 780 V AC, 1387 A, 50 Hz, IP00, thermal class H.","salesMarkdown":"The Siemens 4EU4321-0BM10-0A is a commutating choke (line reactor) designed for the DC link of a converter drive. Its job is to limit current rise rates and reduce harmonic distortion on the line side of a variable-frequency drive or DC drive system. Rated for a continuous 1387 A at 780 V AC, three-phase, 50 Hz, this is a substantial component sized for large industrial drives — think 500+ kW motor loads on pumps, conveyors, or extruders. The 1387 A rated current is the continuous thermal limit at 40 °C ambient. That is the number you match to the drive's input current rating, not the motor's full-load amps. The 780 V AC operating voltage suits 690 V class drives common in European and Asian installations. The 2 % relative inductive voltage drop is the impedance at rated current and frequency — a standard value for commutating chokes that provides enough inductance to smooth commutation notches without excessive voltage drop under load. Inductance is 0.00002 H (20 µH). That is a low value for a choke this size, which is typical for a commutating choke — it only needs to handle the high-frequency switching edges, not the full line-frequency impedance. The DC rated current is 1699.7 A, reflecting the higher RMS content in the DC link versus the AC line side. Total power loss is 940 W (710 W coil + 230 W iron core). That heat must be managed: the IP00 open construction relies on forced air or cabinet ventilation. Thermal class H insulation allows a 180 °C hot-spot temperature, giving margin in a warm cabinet, but the 40 °C ambient rating is the design point — derate above that. ## Physical integration and connections Dimensions are 0.46 m wide × 0.435 m high × 0.265 m deep. This is a floor-mount or chassis-mount component, not a DIN-rail device. The main circuit connection uses flat-type terminals — expect busbar or large cable lugs. Plan for a minimum 1 m³ of clear space around it for airflow and access. The IP00 rating means no enclosure protection; it must live inside a cabinet or electrical room.","metaTitle":"Siemens 4EU4321-0BM10-0A Commutating Choke, 1387 A, 780 V AC","metaDescription":"Siemens 4EU4321-0BM10-0A commutating choke for converter drives. Rated 1387 A at 780 V AC, 3-phase, 50 Hz. IP00, thermal class H. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.265m","Width":"0.46m","Height":"0.435m","Maximum":"1 387A","Rated Value":"1 387A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"1 699.7A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00002H","Power loss [W] of the coil":"710W","Operating voltage rated value":"780V","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","Type of electrical connection for main current circuit":"flat connector","Relative inductive drop in voltage on the measurement level current, voltage and frequency":"2%"}},"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=420418&mlfb=4EU4321-0BM10-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU4321-0BM10-0A/alternatives.json"},"ai":{"faq":[{"question":"Will 4EU4321-0BM10-0A drop into a panel specified around 5SQ2270-2YA04?","answer":"No. The 5SQ2270-2YA04 is a 2-pole DIN-rail miniature circuit breaker (IP20, 55 mm deep). The 4EU4321-0BM10-0A is a 0.46 m wide floor-mount choke (IP00). They are physically and functionally incompatible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU4321-0BM10-0A","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/4EU4321-0BM10-0A 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}}