{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EM5203-4CB00","brand":"Siemens","brandSlug":"siemens","productSlug":"4EM5203-4CB00","canonicalUrl":"https://aoctrl.com/siemens/4EM5203-4CB00","factsUrl":"https://aoctrl.com/api/mcp/products/4EM5203-4CB00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIDAC series, smoothing choke (Glaettungsdrossel), 1-phase, 600V DC, 38A max, 2mH, IP00, screw terminals.","salesMarkdown":"## DC smoothing choke for 38 A bus rails Its 2 mH inductance at 600 V insulation class (IEC 60085 thermal class B) filters ripple from DC bus lines in drives, power supplies, and converter sections. The 30.2 W coil losses and 0.7 W iron-core losses add up to about 31 W total dissipation at rated load — factor that into your enclosure ventilation budget. The 38 A maximum is the DC current the choke can carry without saturating the core — exceed it and inductance drops off fast, losing the smoothing effect. At 0 Hz operating frequency, this choke is designed for pure DC — not for AC line filtering or PWM output stages. The 1.44 W energy content is the stored energy at rated current, useful for sizing discharge resistors if the bus is interrupted. IP00 means no enclosure — mount this inside a panel or cabinet where it's protected from dust and contact. Screw-type terminals accept lugged or ferruled conductors; no spring-cage or push-in here. Dimensions: 0.128 m deep, 0.121 m wide, 0.131 m tall (–). That's roughly a 5-inch cube — allow breathing space around it for the 31 W heat dissipation. No parallel windings option, so it's one path only.","metaTitle":"Siemens SIDAC 4EM5203-4CB00 Smoothing Choke, 38A DC, 2mH","metaDescription":"Siemens SIDAC 4EM5203-4CB00 smoothing choke, 1-phase, 600V DC, 38A rated, 2mH inductance, IP00, screw terminals. Mature lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.128m","Width":"0.121m","Height":"0.131m","Maximum":"38A","Rated Value":"34.2A","Phase number":"1","Energy content":"1.44W","Type of voltage":"DC","lifecycle_stage":"mature","Product brand name":"SIDAC","Product designation":"Glaettungsdrossel","Protection class IP":"IP00","Inductivity rated value":"0.002H","Power loss [W] of the coil":"30.2W","Operating voltage rated value":"600V","Ambient temperature rated value":"40°C","Operating frequency rated value":"0Hz","Power loss [W] of the iron core":"0.7W","Thermal class acc. to IEC 60085":"B","Product function windings in parallel selectable":"No","Type of electrical connection for main current circuit":"screw-type terminals"}},"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=297821&mlfb=4EM5203-4CB00","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EM5203-4CB00/alternatives.json"},"ai":{"faq":[{"question":"What are the key specifications of 4EM5203-4CB00?","answer":"It is a 1-phase DC smoothing choke rated 38 A maximum, 34.2 A continuous, 2 mH inductance, 600 V insulation voltage, IP00 protection, with screw-type terminals. Dimensions are 0.128 m deep, 0.121 m wide, 0.131 m tall."},{"question":"Where can I buy 4EM5203-4CB00?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Does 4EM5203-4CB00 replace or cross-reference to a miniature circuit breaker like 5SJ3140-7?","answer":"No. The 4EM5203-4CB00 is a DC smoothing choke; the 5SJ3140-7 is a 1-pole 40 A AC miniature circuit breaker (MCB) with C-curve tripping. They perform completely different functions — one filters DC ripple, the other protects AC branch circuits. No direct substitution is possible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EM5203-4CB00","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/4EM5203-4CB00 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}}