{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3951-0AN18-4B","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3951-0AN18-4B","canonicalUrl":"https://aoctrl.com/siemens/4EU3951-0AN18-4B","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3951-0AN18-4B","rawCanonicalId":null},"summary":{"shortDescription":"SIDAC output reactor, 3-phase, 400 V AC, 110 A max, 8 kHz switching frequency, 0.3 mH, IP00, flat-type terminals, UL/CSA recognized.","salesMarkdown":"## What this output reactor does on the drive output Its 0.3 mH inductance and 8 kHz switching frequency rating mean it is designed to sit between a variable-frequency drive and the motor, smoothing the PWM voltage spikes that would otherwise degrade motor winding insulation over time. The 8 kHz figure matches the typical carrier frequency of many general-purpose drives, so this reactor will fit a standard VFD output without derating the switching stage. Rated power loss splits into 500 W in the coil and 300 W in the iron core, totalling 800 W at full load. That heat must be managed: the IP00 enclosure (open frame) requires the panel builder to provide forced-air cooling or enough free-air volume to keep the ambient below the 40 °C rating. Thermal class H per IEC 60085 means the insulation system handles 180 °C hot-spot, which gives margin above the 40 °C ambient if airflow is adequate. ## Fit and integration — what the dimensions mean for the panel At 0.41 m wide, 0.38 m high, and 0.22 m deep, this reactor occupies a floor footprint of about 0.16 m² and stands about the height of a standard 16-module DIN-rail enclosure. The flat-type terminals accept busbar or cable lug connections typical of 110 A power circuits; plan for M8 or M10 ring lugs depending on your local code.","metaTitle":"SIDAC 4EU3951-0AN18-4B Output Reactor, 110 A, 8 kHz, 0.3 mH","metaDescription":"SIDAC output reactor, 3-phase, 400 V, 110 A max, 8 kHz switching frequency, 0.3 mH. UL/CSA recognized per EN 61558-2-20. Mature lifecycle; quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.22m","Width":"0.41m","Height":"0.38m","Maximum":"110A","Minimum":"0Hz","Rated Value":"8 000Hz","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","Product brand name":"SIDAC","Product designation":"output reactor","Protection class IP":"IP00","Inductivity rated value":"0.0003H","Power loss [W] of the coil":"500W","Ambient temperature rated value":"40°C","Power loss [W] of the iron core":"300W","Thermal class acc. to IEC 60085":"H","Type of electrical connection for main current circuit":"flat connector"}},"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=250401&mlfb=4EU3951-0AN18-4B","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3951-0AN18-4B/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3951-0AN18-4B","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/4EU3951-0AN18-4B 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}}