{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU2421-0AL00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU2421-0AL00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU2421-0AL00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU2421-0AL00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIDAC output reactor, 3-phase, 35A max, 1mH, 7.4kHz switching frequency, IP00, free cable endings.","salesMarkdown":"## Output reactor for VFD motor protection The Siemens SIDAC 4EU2421-0AL00-0A is a 3-phase output reactor (choke) designed to sit between a variable-frequency drive and its motor. Its job is to limit the rate of voltage rise (dV/dt) and reduce peak voltages from the drive's PWM output, protecting motor winding insulation on longer cable runs or with older motors. Rated for 35 A maximum current at 50 Hz line frequency, with a switching frequency of 7.4 kHz — matching common IGBT drive outputs. Inductance is 1 mH per phase, which gives roughly 4.14 % voltage drop (UK%) at rated conditions — a typical figure for output reactors sized to suppress reflected-wave spikes without excessive voltage sag under load. The 31.5 A operational current rating (I LN) is the continuous current it can carry in normal service; the 35 A figure (ITHMAX) is the thermal maximum for sizing upstream protection. ## Mounting and integration — open-frame chassis IP00 protection class means this is an open-frame component — no enclosure, no touch protection. It mounts inside a panel or cabinet, not exposed to the environment. Dimensions are 0.22 m wide by 0.21 m tall by 0.13 m deep, so it needs a clear footprint on the backplate or chassis floor. Terminations are free cable endings (flying leads), not bus bars or terminal blocks — plan for a strain-relief point and a nearby terminal strip for the motor cable connection. Thermal class H insulation (IEC 60085) means the winding can handle a 180 °C hot-spot temperature — generous headroom for the 111 W total power loss (coil plus iron core) at 40 °C ambient. That loss figure is real heat dumped into the cabinet; factor it into your enclosure ventilation or forced-air cooling calculation, especially if the reactor shares a compartment with the drive. Designed to EN 61558-2-20 (safety of transformers, reactors, and power supply units) and UL/CSA recognized — the description carries that explicitly. That means it meets North American and European safety standards for the reactor class. No RoHS or REACH statement in the record, but Siemens standard production for this series typically complies; verify against the manufacturer's declaration if your compliance audit requires it.","metaTitle":"Siemens SIDAC 4EU2421-0AL00-0A Output Reactor, 35A, 1mH","metaDescription":"Siemens SIDAC 4EU2421-0AL00-0A output reactor, 3-phase, 35A max, 1mH, 7.4kHz switching frequency, IP00, UL/CSA recognized. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.13m","Width":"0.22m","Height":"0.21m","Maximum":"50Hz","Rated Value":"7 400Hz","Phase Number":"3","Type Of Voltage":"AC","lifecycle_stage":"mature","Product Brand Name":"SIDAC","Product Designation":"output reactor","protection class IP":"IP00","current at AC maximum":"35A","Inductivity Rated Value":"0.001H","power loss [W] of the coil":"111W","Ambient Temperature Rated Value":"40°C","power loss [W] of the iron core":"78W","thermal class according to IEC 60085":"H","operational current at AC rated value":"31.5A","Type Of Electrical Connection For Main Current Circuit":"free cable endings"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/03ebb79f8ca45a13a9cf72cd17528f1b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=492684&mlfb=4EU2421-0AL00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU2421-0AL00-0A/alternatives.json"},"ai":{"faq":[{"question":"What are the key specifications of the 4EU2421-0AL00-0A output reactor?","answer":"It is a 3-phase output reactor rated for 35 A maximum current (31.5 A operational), 1 mH inductance per phase, 7.4 kHz switching frequency, 50 Hz line frequency, with 111 W total power loss and Class H insulation. It is IP00 with free cable endings and UL/CSA recognized to EN 61558-2-20."},{"question":"Where can I buy the 4EU2421-0AL00-0A and get current pricing?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Submit your quantity and target delivery window for current pricing and availability confirmation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU2421-0AL00-0A","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/4EU2421-0AL00-0A 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}}