{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3951-7UB00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3951-7UB00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3951-7UB00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3951-7UB00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 4EU3951-7UB00-0A, mains choke for frequency converters, 3-phase, 500 V AC, 1250 A max / 1125 A rated, 50 Hz, IP00, thermal class H, flat-type terminals.","salesMarkdown":"The Siemens 4EU3951-7UB00-0A is a 3-phase mains choke (Netzdrossel f. FU) sized for the output of a frequency converter or the line side of a drive system. It carries a maximum continuous current of 1250 A and a rated current of 1125 A at 500 V AC, 50 Hz, with a rated inductance of 14 µH and a relative inductive voltage drop of 2 % at rated conditions. That 2 % drop is the design target — it limits harmonic distortion and di/dt stress on the drive's input rectifier without dropping so much voltage that the DC bus sags under load. The choke is wound for thermal class H (180 °C) insulation per IEC 60085, which means the winding can run hot without degrading the magnet wire varnish; the coil dissipates 540 W and the iron core another 192 W at full rating, so forced airflow or generous cabinet ventilation is expected — IP00 means no enclosure, so it must live inside a panel that provides the environmental seal. The choke measures 0.41 m wide by 0.385 m tall by 0.229 m deep. Main circuit connections are flat-type terminals — expect busbar or heavy cable lugs, not screw-clamp wire terminals. This is a panel-mount component, not DIN-rail; it bolts into a drive cabinet, typically on a mounting plate near the line input or DC link. At 1125 A continuous, the buswork and fusing upstream need to match — do not undersize the branch circuit. The 1250 A maximum and 1125 A rated current tell you this choke is built for a drive in the 560–710 kW range on 400 V or 500 V class (depending on drive efficiency and overload profile). The 2 % impedance is typical for a line reactor that filters harmonics without creating a significant voltage divider — at 2 %, the voltage drop at full load is about 10 V on a 500 V line, which most drives tolerate easily. The 50 Hz operating frequency is fixed; if your site runs 60 Hz, the choke will still work but the inductive reactance rises by 20 %, increasing the voltage drop to about 2.4 % — still acceptable for most applications, but check the drive's minimum line voltage spec. Thermal class H (180 °C) gives headroom for high-ambient cabinets or poorly ventilated installs, but the 732 W total loss (540 W coil + 192 W core) must be removed — plan for forced air or a derating if the cabinet ambient exceeds 40 °C.","metaTitle":"Siemens 4EU3951-7UB00-0A Mains Choke, 1250 A, 500 V AC, 3-Ph","metaDescription":"Siemens 4EU3951-7UB00-0A mains choke for frequency converters. 3-phase, 1250 A max, 500 V AC, 50 Hz. IP00, thermal class H. 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 250A","Rated Value":"1 125A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","Product designation":"Netzdrossel f. FU","Protection class IP":"IP00","Inductivity rated value":"0.000014H","Power loss [W] of the coil":"540W","Operating voltage rated value":"500V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"192W","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=22591&mlfb=4EU3951-7UB00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3951-7UB00-0A/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 4EU3951-7UB00-0A?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at the time of quote — submit an RFQ for a firm position."},{"question":"What are the key ratings for this mains choke?","answer":"It is a 3-phase, 500 V AC, 50 Hz choke rated at 1125 A continuous (1250 A maximum) with 14 µH inductance and a 2 % voltage drop at rated conditions. Coil power loss is 540 W; iron core loss is 192 W. Insulation is thermal class H (180 °C)."},{"question":"Does 4EU3951-7UB00-0A have UL or CSA recognition?","answer":"The manufacturer states the choke is UL/CSA-recognized per EN 61558-2-20. The IP00 open-frame construction means it requires installation inside an enclosure that provides the environmental and touch protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3951-7UB00-0A","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/4EU3951-7UB00-0A 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}}