{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU4551-0AD18-0B","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU4551-0AD18-0B","canonicalUrl":"https://aoctrl.com/siemens/4EU4551-0AD18-0B","factsUrl":"https://aoctrl.com/api/mcp/products/4EU4551-0AD18-0B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIDAC output reactor, 3-phase, 690 V, 740 A at 120 Hz, 3.4 kHz switching frequency, IP00, thermal class H, flat-type terminals.","salesMarkdown":"The Siemens SIDAC 4EU4551-0AD18-0B is a 3-phase output reactor (choke) rated for 690 V AC, with a maximum continuous current of 740 A at 120 Hz and a rated switching frequency of 3.4 kHz. It carries 666 A rated current at the nominal inductance of 0.05 mH per phase. The IP00 enclosure means it's an open-frame component intended for installation inside a cabinet or panel — no washdown protection, so keep it away from moisture and dust ingress. The 740 A rating at 120 Hz is the thermal limit under the rated switching frequency — this reactor is sized for high-current motor drives running at moderate output frequencies. The 3.4 kHz switching frequency matches IGBT-based drives in the common 2–4 kHz range; if your drive runs a higher carrier frequency, derate the current or look for a reactor with a higher frequency rating. The 7 % impedance (UK) provides enough line reactance to limit di/dt and reduce motor bearing currents, but it's not a heavy-duty harmonic filter — it's a standard output reactor for motor protection. Thermal class H (180 °C insulation) and a 40 °C ambient rating mean the reactor can run hot without derating at that ambient — fine for most industrial enclosures, but if your panel ambient exceeds 40 °C, you'll need to derate the current or add forced cooling. The flat-type terminals (flat connector) are common for high-current busbar connections; expect to bolt on lugs or busbars, not wire ferrules. This reactor mounts between the drive output and the motor cable. The 0.46 m width and 0.43 m height footprint is substantial — plan for a 500 mm wide backplate section and ensure the cabinet depth (0.29 m) fits the available enclosure depth. The IP00 frame means it's not touch-safe; mount it behind a locked door or with a protective cover. The flat terminals are sized for high-current busbars — torque specs should follow the manufacturer's recommendation for the lug size you use.","metaTitle":"Siemens SIDAC 4EU4551-0AD18-0B Output Reactor, 740A, 3.4kHz","metaDescription":"Siemens SIDAC 4EU4551-0AD18-0B 3-phase output reactor, 690 V, 740 A at 120 Hz, 3.4 kHz switching frequency, IP00, thermal class H. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.29m","Width":"0.46m","Height":"0.43m","Maximum":"740A","Minimum":"0Hz","Rated Value":"3 400Hz","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":"0.00005H","Ambient temperature rated value":"40°C","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=91188&mlfb=4EU4551-0AD18-0B","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU4551-0AD18-0B/alternatives.json"},"ai":{"faq":[{"question":"What are the key electrical ratings for 4EU4551-0AD18-0B?","answer":"It is a 3-phase output reactor rated 690 V AC, 740 A at 120 Hz, with a switching frequency of 3.4 kHz and an inductance of 0.05 mH per phase."},{"question":"Where can I buy 4EU4551-0AD18-0B and get current pricing?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."},{"question":"What are the physical dimensions of this reactor?","answer":"Width 0.46 m, height 0.43 m, depth 0.29 m — plan for a 500 mm wide backplate and ensure the cabinet depth accommodates the 0.29 m depth."},{"question":"Will 4EU4551-0AD18-0B drop into a panel specified around 5SJ3140-7?","answer":"No — 5SJ3140-7 is a miniature circuit breaker (MCB) with a completely different form factor, mounting, and function. This reactor is a large open-frame component with flat terminals; it will not fit the same DIN-rail footprint or wiring scheme."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU4551-0AD18-0B","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/4EU4551-0AD18-0B 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}}