{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8608-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8608-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8608-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8608-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY8608-8, 4-pole (3P+N), D characteristic, 8 A at 45 °C, 40 kA breaking capacity at 400 V AC per IEC 60947-2.","salesMarkdown":"The Siemens 5SY8608-8 is a SENTRON miniature circuit breaker — a 4-pole (3P+N) unit with a D tripping characteristic, rated 8 A at 45 °C and 400 V AC. ## Breaking capacity — the number that decides selectivity At DC per IEC 60947-2 it's rated 15 kA. For UL 1077 / CSA C22.2 No. 235 supplemental protection, the rating is 5 kA at AC — a different standard, not a derating; UL 1077 recognizes a lower SCCR for supplementary protectors than the IEC main standard. ## Thermal derating and environment The 8 A rating holds at 45 °C ambient. At 50 °C it derates to 7.75 A; at 55 °C to 7.5 A. The breaker operates from -40 °C to 75 °C ambient, with humidity limits of 95% up to 55 °C, tapering to 35% at 75 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. IP20 with connected conductors — finger-safe but not washdown; keep it inside a sealed enclosure if the panel sees hose-down.","metaTitle":"Siemens 5SY8608-8 SENTRON MCB, 4P D-curve 8A 40kA","metaDescription":"Siemens SENTRON 5SY8608-8 miniature circuit breaker, 4-pole (3P+N), D tripping characteristic, 8 A rated at 45 °C, 40 kA breaking capacity at 400 V AC per IEC 60947-2. Current prod","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY8608-8","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, 3P+N, D8","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","Type Of Voltage":"AC","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":"400 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"3P+N","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"8 A","at 50 °C / rated value":"7.75 A","at 55 °C / rated value":"7.5 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"40 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","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","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 Function / Neutral Conductor Switching":"Yes","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 (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a98558f1e0414b7807273fd189adbb71.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=212745&mlfb=5SY8608-8"},"ai":{"faq":[{"question":"Where can I buy 5SY8608-8 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm number."},{"question":"What is 5SY8608-8's breaking capacity at 400 V AC?","answer":"40 kA per IEC 60947-2 at 400 V AC. At DC per the same standard it's 15 kA; under UL 1077 / CSA C22.2 No. 235 it's 5 kA at AC."},{"question":"What compliance documentation does Siemens provide for 5SY8608-8?","answer":"The breaker carries IEC 60947-2 ratings and UL 1077 / CSA C22.2 No. 235 supplemental protection recognition. Material-wise it's halogen-free and silicon-free. Standard Siemens declarations (CE, UKCA, RoHS, REACH) apply to the SENTRON line."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8608-8","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/5SY8608-8 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}}