{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8204-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8204-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8204-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8204-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY8204-8, D-curve, 2-pole, 4 A rated at 45 °C, 50 kA IEC 60947-2 breaking capacity, IP20, 2 MW wide.","salesMarkdown":"The D-curve trips between 10× and 20× rated current, so it holds through the magnetizing surge of a small motor or solenoid bank. The DC rating is 15 kA per the same standard, and UL 1077 / CSA C22.2 No. 235 lists it at 5 kA for North American recognition. Mounting position is unrestricted — vertical, horizontal, or inverted. The combined terminal at top and bottom accepts conductors for loop-through wiring without extra bridging bars. ## Temperature derating and ambient limits Rated 4 A at 45 °C ambient. At 50 °C the continuous rating drops to 3.88 A; at 55 °C it is 3.75 A. The breaker is rated for ambient from -40 °C to 75 °C, with humidity limits of 95% RH up to 55 °C, 55% RH at 70 °C, and 35% RH at 75 °C. If the panel ambient exceeds 45 °C, size the load accordingly — the thermal-magnetic trip element responds to the actual conductor temperature, so a 4 A load at 55 °C may nuisance-trip or run at the edge of the thermal curve.","metaTitle":"Siemens 5SY8204-8 SENTRON MCB, D-curve, 2-pole, 4 A, 50 kA","metaDescription":"Siemens 5SY8204-8 SENTRON miniature circuit breaker, D tripping characteristic, 2-pole, 4 A rated at 45 °C, 50 kA IEC 60947-2, IP20. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY8204-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 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","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"4 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"4 A","at 50 °C / rated value":"3.88 A","at 55 °C / rated value":"3.75 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"50 kA","Product Feature / Touch Protection":"Yes","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","Type Of Voltage / Of The Operating Voltage":"AC","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Component / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","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/78dff326ae80a495dda033f47751bec6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=432026&mlfb=5SY8204-8"},"ai":{"faq":[{"question":"Where can I buy 5SY8204-8 and how do I get a price?","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 price and lead time."},{"question":"What is 5SY8204-8's listed depth and width?","answer":"Depth is 76 mm; width is 36 mm (2 modular width units). Installation depth behind the panel face is 70 mm."},{"question":"What compliance documentation does Siemens provide for 5SY8204-8?","answer":"The breaker is halogen-free and silicon-free. It carries IEC 60947-2 (50 kA breaking capacity), UL 1077 / CSA C22.2 No. 235 (5 kA), and is rated for pollution degree 3 and overvoltage category III. The manufacturer provides RoHS and REACH declarations on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8204-8","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/5SY8204-8 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}}