{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3951-8UB00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3951-8UB00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3951-8UB00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3951-8UB00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3951-8UB00-0A mains choke (Netzdrossel f. FU), 3-phase, 480V AC, 1260A rated current, 1400A max, 0.01 mH, IP00, flat-type terminals.","salesMarkdown":"The Siemens 4EU3951-8UB00-0A is a three-phase mains choke (Netzdrossel f. FU) designed for the input side of a frequency converter drive. Its job is to smooth line current, limit harmonic distortion, and reduce voltage notching on the supply — a standard line-reactor role for a 480 V AC, 50/60 Hz three-phase feed. The 1260 A rated current (1400 A maximum) and 0.01 mH inductance place it squarely in the heavy industrial drive class, sized for a large motor load — think multi-hundred-kilowatt pumps, conveyors, or compressor trains. Go much higher and you lose torque headroom; much lower and the harmonic filtering drops off. This one hits the sweet spot for general-purpose drive protection. ## Thermal and environmental limits Rated for 40 °C ambient, thermal class H. Coil power loss 540 W, iron core 190 W. IP00 open-frame. The part carries UL/CSA recognition per EN 61558-2-20, which covers safety requirements for chokes and reactors. That means it is accepted for North American panel builds without a separate UL evaluation. No RoHS or REACH statement appears in the available documentation — if compliance documentation is required for your quality system, request the manufacturer's declaration at quote time.","metaTitle":"Siemens 4EU3951-8UB00-0A Mains Choke, 1260A, 480V, 3-Phase","metaDescription":"Siemens 4EU3951-8UB00-0A mains choke for frequency converters. 1260A rated, 1400A max, 480V AC, 3-phase. IP00, flat-type terminals. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.229m","Width":"0.41m","Height":"0.385m","Maximum":"1 400A","Rated Value":"1 260A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","Product designation":"Netzdrossel f. FU","Protection class IP":"IP00","Inductivity rated value":"0.00001H","Power loss [W] of the coil":"540W","Operating voltage rated value":"400, 480V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50 ... 60Hz","Power loss [W] of the iron core":"190W","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=261135&mlfb=4EU3951-8UB00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3951-8UB00-0A/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3951-8UB00-0A","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/4EU3951-8UB00-0A 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}}