{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0AH00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0AH00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0AH00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0AH00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-0AH00-0A commutating choke for converter, 3-phase, 800V AC, 360A rated (400A max), 75µH, IP00, flat-type terminals, class H insulation.","salesMarkdown":"Rated at 360 A continuous (400 A maximum) on 800 V AC, 60 Hz, with an inductance of 75 µH (0.000075 H). Thermal class H per IEC 60085 means the winding insulation is rated for a 180 °C hot-spot temperature, giving headroom in a 45 °C ambient. ## Sizing and fit — what the ratings mean The 360 A rated current (400 A max) is the continuous thermal current (Ith) at 45 °C ambient. For a 3-phase converter feeding a motor load, this choke can handle the full rated current of a drive in that current class. The 490.1 A DC rating means it also carries the DC-link current if used on the DC side — useful if you are repurposing it as a DC link choke, though the primary application is AC line side. Physical dimensions: 0.41 m wide × 0.385 m high × 0.229 m deep. That footprint and the flat-type terminals (bus-bar style) mean it is a substantial component — not a DIN-rail mount. Expect to bolt it to a backplate or chassis inside the panel, with bus-bar connections rather than wire terminals. The 2.42% voltage drop at rated current is within the typical 2–4% range for a commutating choke. This is a design parameter: too low a drop gives less di/dt limiting; too high a drop robs voltage from the drive. At 800 V line, the drop is about 19 V per phase — negligible for a 690–800 V drive bus. IP00 and flat-type terminals: this choke is designed for cabinet mounting with bus-bar connections. The 0.41 m width and 0.385 m height mean it occupies a significant footprint. The 45 °C ambient rating is the maximum surrounding air temperature for full-rated current. If your panel ambient exceeds that, derate per the thermal curve — class H insulation gives headroom, but the core and winding losses still need to be vented. Forced ventilation or a larger cabinet may be needed if the choke is near other heat sources.","metaTitle":"Siemens 4EU3921-0AH00-0A Commutating Choke, 360A, 800V, 3-Ph","metaDescription":"Siemens 4EU3921-0AH00-0A commutating choke for converters. 3-phase, 360A rated, 800V AC, 75µH, IP00. Mature lifecycle; sourced to order. Quoted on request.","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":"400A","Rated Value":"360A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"490.1A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.000075H","Operating voltage rated value":"800V","Ambient temperature rated value":"45°C","Operating frequency rated value":"60Hz","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":"2.42%"}},"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=57128&mlfb=4EU3921-0AH00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0AH00-0A/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0AH00-0A","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/4EU3921-0AH00-0A 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}}