{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3951-1UB00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3951-1UB00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3951-1UB00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3951-1UB00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 4EU3951-1UB00-0A mains choke (Netzdrossel f. FU), 3-phase, AC, 910 A max, 400/480 VAC, 50/60 Hz, 31 µH, 4% voltage drop, IP00, flat-type terminals.","salesMarkdown":"The Siemens 4EU3951-1UB00-0A is a three-phase mains choke (line reactor) designed for installation ahead of a variable-frequency drive (FU). It smooths line-side harmonics and limits inrush current by presenting a 31 µH inductance at a 4% relative inductive voltage drop under rated conditions. Rated for 400/480 VAC at 50/60 Hz, it carries a maximum AC current of 910 A and a continuous rated current of 819 A. Total power loss sums to 730 W — 540 W in the coil and 190 W in the iron core — all dissipated into the surrounding air through the open IP00 frame. The 4% voltage drop figure is the key sizing parameter: it tells you the choke will drop 4% of line voltage at rated current and frequency, which is the standard impedance for most VFD line reactors. The 31 µH inductance value lets you verify coordination with the drive's DC-link capacitance. ## Thermal class and enclosure Insulation is Class H per IEC 60085, meaning the winding can sustain a 180 °C hot-spot temperature — a necessary margin for a 730 W loss device mounted in a warm cabinet. The IP00 rating means it is an open-frame component: no finger-safe cover, no drip shield. It must be installed inside a locked electrical enclosure with adequate ventilation or forced-air cooling. Dimensions are 0.385 m high by 0.41 m wide by 0.229 m deep. The main circuit connects via flat-type terminals (bus-bar or flat-cable lugs), not ring terminals or spring clamps — plan your bus-bar drill pattern and lug crimp tooling accordingly.","metaTitle":"4EU3951-1UB00-0A Siemens Mains Choke, 910 A, 400/480 VAC","metaDescription":"Siemens 4EU3951-1UB00-0A mains choke for VFD, 3-phase, 910 A max, 400/480 VAC, 50/60 Hz, 31 µH, IP00. Mature lifecycle, 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","title":"4EU3951-1UB00-0A","Height":"0.385m","description":"MAINS CHOKE F.FU; PHASES:3; UN1(V):480; ITHMAX 1(A) / F1(HZ):910 /60; I LN (A):819; UK(%):4; LN(MH):0,031; TA/ISOKL:40 /H; IP00; TYPE OF TERMINALS:FLAT-TYPE TERMINAL; EN 61558-2-20 >UL/CSA-RECOGNIZED< >CHOKE<","Phase Number":"3","Type Of Voltage":"AC","lifecycle_stage":"mature","Product Designation":"Netzdrossel f. FU","protection class IP":"IP00","current at AC maximum":"910A","Inductivity Rated Value":"3.1E-5H","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 according to IEC 60085":"H","operational current at AC rated value":"819A","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0e04413f5c56e9175933d41079700bee.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=372357&mlfb=4EU3951-1UB00-0A"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 4EU3951-1UB00-0A?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ through the storefront; availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does this brand provide for 4EU3951-1UB00-0A?","answer":"The part carries UL/CSA recognition per EN 61558-2-20, as stated in the manufacturer's description. RoHS and REACH declarations are typically available from the manufacturer upon request."},{"question":"What is the 4% voltage drop rating and why does it matter?","answer":"The 4% relative inductive voltage drop at rated current and frequency is the standard impedance for VFD line reactors. It provides enough inductance to limit harmonic distortion and inrush without causing excessive voltage sag under load."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3951-1UB00-0A","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/4EU3951-1UB00-0A when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}