{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4204-8CV","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4204-8CV","canonicalUrl":"https://aoctrl.com/siemens/5SY4204-8CV","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4204-8CV","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY4 series, 2-pole miniature circuit breaker, D characteristic, 4 A rated current, 15 kA breaking capacity per IEC 60947-2, 440 V AC, IP20.","salesMarkdown":"## What this breaker is It's designed for IEC 60947-2 industrial applications — mechanical engineering and industry panels — not domestic distribution boards. The quick assembly system clips onto the rail without tools. IP20 is achieved only with connected conductors. ## Thermal derating — the real-world rating The 4 A rating holds at 35 °C ambient. At 40 °C it's 3.71 A; at 45 °C, 3.55 A; at 50 °C, 3.4 A; at 55 °C, 3.22 A. Humidity also plays: max 95% up to 55 °C, dropping to 35% at 75 °C. The breaker itself is rated for -40 to 75 °C operating ambient, but the load current you can pass shrinks as the panel heats up.","metaTitle":"5SY4204-8CV 2-Pole MCB, D-Curve 4A, 15kA, IP20","metaDescription":"5SY4204-8CV 2-pole miniature circuit breaker, D tripping characteristic, 4A rated, 15kA breaking capacity per IEC 60947-2. Current production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY4204-8CV","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2","description":"MCB Icu=15KA 400V 2P D4","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Degree Of Pollution":"3","at AC / rated value":"4 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","according to EN 61346-2":"F","at 35 °C / rated value":"4 A","at 40 °C / rated value":"3.71 A","at 45 °C / rated value":"3.55 A","at 50 °C / rated value":"3.4 A","at 55 °C / rated value":"3.22 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","Supply Voltage Frequency / Rated Value":"50/60 Hz","according to IEC 60947-2 / rated value":"15 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/77997f8f474618d2198dfd224c2c7e16.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1531541&mlfb=5SY4204-8CV"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4204-8CV?","answer":"15 kA rated breaking capacity per IEC 60947-2 at 440 V AC, multi-phase operation."},{"question":"Where can I buy 5SY4204-8CV?","answer":"Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4204-8CV","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/5SY4204-8CV when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}