{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU2421-0AB00-4B","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU2421-0AB00-4B","canonicalUrl":"https://aoctrl.com/siemens/4EU2421-0AB00-4B","factsUrl":"https://aoctrl.com/api/mcp/products/4EU2421-0AB00-4B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU2421-0AB00-4B commutating choke for converter, 3-phase AC, 91.1 A at 60 Hz, 400 V, 0.28 mH, IP00, thermal class H, flat-type terminals.","salesMarkdown":"The Siemens 4EU2421-0AB00-4B is a 3-phase commutating choke (smoothing reactor) designed for use with line-commutated converters — the type that drives DC motors or serves as a DC-link supply in variable-speed drives. Its job is to limit the rate of rise of fault current (di/dt) during commutation and to reduce harmonic distortion on the AC line. Rated 91.1 A AC at 60 Hz, 400 V, with an inductance of 0.28 mH and a relative inductive voltage drop of 4% at rated current, it's sized for a specific converter output — not a general-purpose line reactor. The 4% voltage drop at rated current is the key selection parameter: it tells you the choke will drop 4% of line voltage under full load, which the converter must be able to tolerate. At 91.1 A AC and 111.6 A DC, this choke handles the pulsed DC link of a converter rated for roughly 50–60 kW output — ballpark. The 80.2 W copper loss plus 46.6 W iron loss total about 127 W of heat that must be dissipated; with IP00 open-frame construction, it relies on cabinet airflow, not enclosure cooling. Thermal class H means the winding insulation withstands 180 °C hot-spot temperature — adequate for a 40 °C ambient with natural convection, but derate if your cabinet runs hotter. Dimensions are 0.225 m wide × 0.21 m high × 0.136 m deep. Flat-type terminals for the main circuit — expect busbar or cable lug connections, not screw-clamp. IP00 means no enclosure; mount it inside a ventilated cabinet with clearance around the core for airflow. The 0.28 mH inductance at 60 Hz is a fixed value — no taps or adjustment. For a 50 Hz line, the same choke will saturate at a slightly lower current because the volt-second product is higher; verify with the converter manufacturer if your line frequency differs.","metaTitle":"Siemens 4EU2421-0AB00-4B Commutating Choke, 91.1 A AC, 400 V","metaDescription":"Siemens 4EU2421-0AB00-4B commutating choke for converter, 3-phase AC, 91.1 A at 60 Hz, 400 V, 0.28 mH, IP00, thermal class H. Mature lifecycle, available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.136m","Width":"0.225m","Height":"0.21m","Phase Number":"3","Type Of Voltage":"AC","lifecycle_stage":"mature","Product Designation":"Kommut.-Drossel f. Stromrichter","protection class IP":"IP00","current at AC maximum":"91.1A","Inductivity Rated Value":"0.00028H","current at DC rated value":"111.6A","power loss [W] of the coil":"80.2W","Operating Voltage Rated Value":"400V","Ambient Temperature Rated Value":"40°C","Operating Frequency Rated Value":"60Hz","power loss [W] of the iron core":"46.6W","thermal class acc. to IEC 60085":"H","operational current at AC rated value":"81.99A","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":"https://cdn.aoctrl.com/56fe0708296495b0d31a96d0c578012c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=515104&mlfb=4EU2421-0AB00-4B","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU2421-0AB00-4B/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 4EU2421-0AB00-4B?","answer":"The part is designed to EN 61558-2-20 (safety of transformers, reactors, and power supply units). No UL, CSA, or specific RoHS/REACH declarations are listed in the available documentation. Request a declaration of conformity or material compliance sheet with your RFQ."},{"question":"Where can I buy 4EU2421-0AB00-4B and how is it quoted?","answer":"We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no automatic stock figure is published."},{"question":"What are the key electrical ratings of 4EU2421-0AB00-4B?","answer":"3-phase AC, 91.1 A at 60 Hz, 400 V, 0.28 mH inductance, 4% inductive voltage drop at rated current. DC rated current is 111.6 A. Copper loss 80.2 W, iron loss 46.6 W."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU2421-0AB00-4B","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/4EU2421-0AB00-4B 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}}