{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0CB00","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0CB00","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0CB00","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0CB00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-0CB00 commutating choke for converter, 3-phase, 400 V AC, 50 Hz, 650 A rated, 62 µH, IP00, Class H, flat-type terminals.","salesMarkdown":"## What this choke does on a drive line The Siemens 4EU3921-0CB00 is a 3-phase commutating choke (line reactor) rated for 650 A continuous at 400 V AC, 50 Hz. It sits between the supply and a converter (VFD or DC drive) to limit current rise during commutation, reduce harmonic distortion, and protect the drive's input diodes from switching transients. The same choke carries 796.5 A in DC duty, so if you're using it on the DC link side of a 6-pulse rectifier, you get that headroom. The 5.5 % impedance is the key number for coordination: it limits fault current enough to let downstream fuses or breakers clear without the choke saturating. Class H insulation (180 °C thermal class per IEC 60085) means the winding can run hot — total losses are 740 W (530 W coil + 210 W iron core) — so forced air or spacing from other heat sources matters inside the cabinet. IP00 open-frame construction — no enclosure, so it goes inside a panel or drive cabinet. Dimensions are 0.41 m wide × 0.385 m tall × 0.229 m deep. Main circuit connections use flat-type terminals (bus-bar style), not screw clamps or spring cages. Plan for bolted lugs or bus-bar jumpers. No DIN-rail clip; it bolts to the chassis or sub-panel.","metaTitle":"Siemens 4EU3921-0CB00 Commutating Choke, 650 A, 62 µH, 400 V","metaDescription":"Siemens 4EU3921-0CB00 commutating choke for converter duty. 3-phase, 650 A rated, 62 µH, 400 V AC, IP00. Class H insulation, flat terminals. Sourced to order. Request RFQ.","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":"650A","Rated Value":"650A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"796.5A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.000062H","Power loss [W] of the coil":"530W","Operating voltage rated value":"400V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"210W","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":"5.5%"}},"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=490970&mlfb=4EU3921-0CB00","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0CB00/alternatives.json"},"ai":{"faq":[{"question":"What are the key electrical ratings for 4EU3921-0CB00?","answer":"3-phase, 400 V AC, 50 Hz, 650 A continuous (796.5 A DC), 62 µH inductance, 5.5 % impedance, Class H insulation, IP00 enclosure."},{"question":"Will 4EU3921-0CB00 drop into a panel designed for a motor circuit breaker like 3RV6011-0CA10?","answer":"No. The 4EU3921-0CB00 is a 650 A, 62 µH commutating choke measuring 0.41 m × 0.385 m × 0.229 m with flat-type bus-bar terminals. The 3RV6011-0CA10 is a 0.25 A motor-protection circuit breaker on a 35 mm DIN rail. They serve completely different functions and have no mounting or wiring commonality."},{"question":"Where can I buy 4EU3921-0CB00 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0CB00","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/4EU3921-0CB00 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}}