{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3951-8UA00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3951-8UA00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3951-8UA00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3951-8UA00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 4EU3951-8UA00-0A mains choke (Netzdrossel f. FU), 3-phase, 690V AC, 360A rated / 400A max, 0.13 mH, 4% voltage drop, IP00, Class H, flat-type terminals, UL/CSA recognized.","salesMarkdown":"## What this choke does in the drive line The Siemens 4EU3951-8UA00-0A is a three-phase mains choke (Netzdrossel f. FU) sized for variable-frequency drive input lines. It sits between the supply and the drive rectifier, smoothing current harmonics and limiting inrush. The 360 A rated current (400 A maximum) at 690 V AC and 50 Hz tells you this is a heavy line reactor — think large conveyor drives, pump stations, or compressor banks on 690 V three-phase. The 0.13 mH inductance with a 4 % relative voltage drop at rated current is the key selection figure: that drop defines how much harmonic attenuation you get versus how much voltage headroom the drive loses. At 540 W coil loss plus 190 W iron loss, the total 730 W heat dump needs panel ventilation — IP00 open-frame means it is not sealed; mount it in a clean, dry cabinet with airflow. ## Ratings that govern fit The 360 A rated current is the continuous thermal baseline at 40 °C ambient. That is the number to match against your drive's input current at full load — not the 400 A maximum, which is a short-term overload ceiling. Class H insulation per IEC 60085 means the winding can survive 180 °C hot-spot temperature; that buys you margin in a warm cabinet or under sustained harmonic load. The 4 % voltage drop is measured at rated current, voltage, and frequency — it is the impedance the choke presents to the line, and it determines both the harmonic filtering effect and the voltage sag the drive sees. Flat-type terminals for the main circuit mean bus-bar or large-lug connections, not finger-safe spring cages. ## Physical integration The dimensions are 0.41 m wide by 0.385 m tall by 0.229 m deep — about 16 × 15 × 9 inches. That is a substantial iron core; it needs a dedicated mounting plate or sub-panel, not a DIN rail. IP00 means no enclosure protection — the live terminals and core are exposed. Install it in a locked cabinet with at least the clearance specified in the Siemens manual for heat dissipation. The flat-type terminals accept bus-bar or crimp lugs; plan for torque-rated connections.","metaTitle":"Siemens 4EU3951-8UA00-0A Mains Choke, 360A/690V/50Hz, 0.13mH","metaDescription":"Siemens 4EU3951-8UA00-0A 3-phase mains choke for VFDs. 360A rated, 690V, 50Hz, 0.13mH, 4% voltage drop. IP00, Class H, UL/CSA recognized. Sourced to order.","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","Product designation":"Netzdrossel f. FU","Protection class IP":"IP00","Inductivity rated value":"0.00013H","Power loss [W] of the coil":"540W","Operating voltage rated value":"690V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","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":"4%"}},"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=491461&mlfb=4EU3951-8UA00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3951-8UA00-0A/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for the 4EU3951-8UA00-0A?","answer":"360 A rated current, 400 A maximum, 690 V AC, 50 Hz, 0.13 mH inductance, 4 % voltage drop at rated current, Class H insulation, IP00 enclosure, and flat-type terminals."},{"question":"Where can I buy the 4EU3951-8UA00-0A?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers on the public listing."},{"question":"Does the 4EU3951-8UA00-0A have UL or CSA approval?","answer":"Yes. The product description states it is UL/CSA recognized, compliant with EN 61558-2-20, which covers chokes and reactors for power supplies."},{"question":"What is the physical size of this choke?","answer":"0.41 m wide, 0.385 m tall, 0.229 m deep. It is a panel-mount component, not DIN-rail mountable."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3951-8UA00-0A","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/4EU3951-8UA00-0A 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}}