{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EM5212-8CB00","brand":"Siemens","brandSlug":"siemens","productSlug":"4EM5212-8CB00","canonicalUrl":"https://aoctrl.com/siemens/4EM5212-8CB00","factsUrl":"https://aoctrl.com/api/mcp/products/4EM5212-8CB00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EM5212-8CB00, single-phase commutating choke for converter applications, 400V AC, 35.5A AC max, 50Hz, IP00, screw-type terminals.","salesMarkdown":"The Siemens 4EM5212-8CB00 is a single-phase commutating choke (line reactor) designed for converter front ends. It sits between the AC supply and the converter input to limit current rise rates, reduce harmonics, and protect the DC link from line transients. Rated for 400V AC at 50 Hz, it carries 35.5 A maximum AC current and 31.95 A rated operational current in continuous duty. ## Mounting and connection This choke is IP00 — no enclosure, no drip shield. It's intended for a clean, dry cabinet where it can be bolted down and wired via its screw-type terminals. Dimensions are 0.121 m wide by 0.131 m tall by 0.128 m deep, so it'll fit in a standard 200 mm deep enclosure with room for cable bends. The screw terminals accept common power wiring; no special lugs or crimp tools needed for field replacement. ## Thermal and electrical limits Thermal class B per IEC 60085 means the insulation system is rated for 130 °C hot-spot. At 40 °C ambient, total power loss splits 22 W in the coil and 36 W in the iron core — 58 W to vent inside the cabinet. The DC-rated current of 43.5 A is higher than the AC rating because DC doesn't induce the same skin and proximity losses; use that figure if the choke sits on the DC bus side of a converter.","metaTitle":"Siemens 4EM5212-8CB00 Commutating Choke, 400V 35.5A AC, IP00","metaDescription":"Siemens 4EM5212-8CB00 single-phase commutating choke for converters. Rated 400V AC, 35.5A AC max, 50Hz. IP00, screw terminals, thermal class B. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.128m","Width":"0.121m","Height":"0.131m","Phase Number":"1","Type Of Voltage":"AC","lifecycle_stage":"mature","Product Designation":"Kommut.-Drossel f. Stromrichter","protection class IP":"IP00","current at AC maximum":"35.5A","Inductivity Rated Value":"0.0014H","current at DC rated value":"43.5A","power loss [W] of the coil":"22W","Operating Voltage Rated Value":"400V","Ambient Temperature Rated Value":"40°C","Operating Frequency Rated Value":"50Hz","power loss [W] of the iron core":"36W","thermal class according to IEC 60085":"B","operational current at AC rated value":"31.95A","Type Of Electrical Connection For Main Current Circuit":"screw-type terminals","Relative Inductive Drop In Voltage For Rated Value Of The 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=239480&mlfb=4EM5212-8CB00","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EM5212-8CB00/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for 4EM5212-8CB00?","answer":"Single-phase, 400V AC, 50 Hz. Maximum AC current is 35.5 A; rated operational AC current is 31.95 A. DC rated current is 43.5 A. Inductance is 1.4 mH with a 4% voltage drop at rated conditions. Thermal class B, IP00 enclosure, screw terminals."},{"question":"Will 4EM5212-8CB00 drop in where a 5SJ3140-7 was specified?","answer":"No — 5SJ3140-7 is a 1-pole 40 A miniature circuit breaker (MCB), not a choke. Different function entirely. The 4EM5212-8CB00 is a commutating choke for converter input; it doesn't replace a breaker."},{"question":"Where can I buy 4EM5212-8CB00 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for your volume and delivery needs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EM5212-8CB00","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/4EM5212-8CB00 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}}