{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EP3901-5DS00","brand":"Siemens","brandSlug":"siemens","productSlug":"4EP3901-5DS00","canonicalUrl":"https://aoctrl.com/siemens/4EP3901-5DS00","factsUrl":"https://aoctrl.com/api/mcp/products/4EP3901-5DS00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EP3901-5DS00, 3-phase commutating choke for converter applications, 40.5A rated current, 500V AC, 50Hz, IP00 enclosure, screw terminals.","salesMarkdown":"Its job is to limit the rate of rise of current (di/dt) during commutation events in the rectifier — reducing harmonic distortion, protecting the DC-link capacitors, and smoothing the current waveform so the drive or inverter sees a cleaner supply. Rated for 40.5 A continuous at 500 V AC, 50 Hz, with a peak current capability of 56 A and a DC rated value of 55.1 A, this choke sits between the supply and the converter input. The 0.65 mH inductance and 4% relative inductive voltage drop are the key numbers that determine its filtering effect; the 4% drop means it's sized for moderate harmonic mitigation — enough for most variable-speed drive installations without excessive voltage loss under load. ## Thermal and mounting reality This is an IP00 choke — no enclosure, no finger protection. The thermal class B insulation (130 °C continuous) and 70 W coil loss plus 16.5 W iron core loss mean it dissipates about 86.5 W total at rated load. In a panel, that heat has to be managed: the 0.219 m width, 0.179 m height, and 0.123 m depth dimensions give it a moderate footprint, but the 40 °C ambient temperature rating means derating is required above that — a panel at 50 °C ambient will need to reduce the continuous current or add forced ventilation. The headline numbers that govern fit are the 40.5 A rated current (AC, 3-phase, 50 Hz) and the 500 V operating voltage. The 56 A peak current tells you the choke can handle short-duration overloads — typical for motor starting or converter inrush — without saturating. The DC rated value of 55.1 A is relevant if the choke is used on the DC link side of a converter, though the primary application is AC line-side. The 4% voltage drop at rated current and frequency is the impedance figure: a 4% choke is a common choice for general-purpose drive input filtering. Too low (1-2%) and you get less harmonic attenuation; too high (5-8%) and you start losing significant voltage to the choke, which can reduce motor torque at the end of a long cable run. This 4% value is a balanced middle ground. The 0.65 mH inductance per phase is the actual design parameter that determines the resonant frequency of the L-C filter formed with the DC-link capacitors; if you're replacing a choke in an existing drive cabinet, match this inductance value within ±10% to avoid shifting the filter's cutoff frequency.","metaTitle":"Siemens 4EP3901-5DS00 Commutating Choke, 40.5A, 500V, 3-Phas","metaDescription":"Siemens 4EP3901-5DS00 commutating choke for converters. 3-phase, 40.5A rated, 500V AC, 50Hz, IP00. Sourced to order. Request RFQ for current pricing and availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.123m","Width":"0.219m","Height":"0.179m","Maximum":"45A","Rated Value":"40.5A","Peak current":"56A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"55.1A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00065H","Power loss [W] of the coil":"70W","Operating voltage rated value":"500V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"16.5W","Thermal class acc. to IEC 60085":"B","Type of electrical connection for main current circuit":"screw-type terminals","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=510947&mlfb=4EP3901-5DS00","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EP3901-5DS00/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 4EP3901-5DS00 and get current pricing?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quotation (RFQ) to confirm current availability and pricing — these are confirmed at quote time and are not published as a fixed list price."},{"question":"What are the key specifications of the 4EP3901-5DS00?","answer":"It is a 3-phase commutating choke rated 40.5 A continuous at 500 V AC, 50 Hz, with 0.65 mH inductance, 4% voltage drop, IP00 enclosure, and screw-type terminals. Peak current is 56 A; DC rated current is 55.1 A. Thermal class B insulation with 70 W coil loss and 16.5 W iron core loss at 40 °C ambient."},{"question":"What compliance documentation is available for the 4EP3901-5DS00?","answer":"The part is designed to EN 61558-2-20 (safety of transformers, reactors, and power supply units). The thermal class is B per IEC 60085. For specific RoHS, REACH, or UL documentation, request the manufacturer's declaration of conformity with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EP3901-5DS00","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/4EP3901-5DS00 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}}