{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4108-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4108-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4108-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4108-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4108-8CC, 1-pole miniature circuit breaker, D characteristic, 8 A (40 °C), 10 kA per EN 60898, 1 MW.","salesMarkdown":"The Siemens 5SY4108-8CC is a 1-pole miniature circuit breaker from the SENTRON 5SY series, sized at 1 modular width unit (18 mm) for DIN-rail mounting in distribution boards and control panels. Its D tripping characteristic means it tolerates the high inrush currents of motor and transformer loads — the magnetic trip threshold sits between 10× and 20× rated current, so it won't nuisance-trip on a motor start but clears hard faults fast. Rated 8 A at 40 °C ambient, the breaker delivers 10 kA breaking capacity per EN 60898 (5 kA per UL 1077 / CSA C22.2 No.235), which covers most industrial and commercial panel fault levels. The 1-pole design switches the line conductor only — no neutral pole — so it's intended for single-phase branch circuits or as a phase leg in multi-pole assemblies. ## Temperature derating — the real current rating The 8 A rating holds only up to 35 °C. Above that, the breaker must be derated: 7.35 A at 40 °C, 7 A at 45 °C, 6.63 A at 50 °C, and 6.25 A at 55 °C. If your panel runs warm — say 50 °C inside the enclosure — the usable continuous current drops to 6.63 A. Plan the branch circuit load against the derated value at your actual ambient, not the 35 °C sticker figure. IP20 with connected conductors — standard for panel-internal use.","metaTitle":"Siemens 5SY4108-8CC SENTRON MCB, 1P D-curve 8A, 10kA","metaDescription":"Siemens 5SY4108-8CC SENTRON miniature circuit breaker, 1-pole, D tripping characteristic, 8 A rated at 40 °C, 10 kA breaking capacity per EN 60898. Active production, available to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY4108-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230/400 V 10kA, 1-pole, D, 8A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","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":"8 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","acc. to DIN EN 61346-2":"F","at 35 °C / rated value":"8 A","at 40 °C / rated value":"7.35 A","at 45 °C / rated value":"7 A","at 50 °C / rated value":"6.63 A","at 55 °C / rated value":"6.25 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","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","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/ed8975ca1ca4872eee4ee63b42041701.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=147331&mlfb=5SY4108-8CC"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4108-8CC?","answer":"10 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No.235, both at AC voltage."},{"question":"What is the temperature derating for 5SY4108-8CC?","answer":"Rated 8 A at 35 °C, derated to 7.35 A at 40 °C, 7 A at 45 °C, 6.63 A at 50 °C, and 6.25 A at 55 °C."},{"question":"Where can I buy 5SY4108-8CC?","answer":"Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4108-8CC","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/5SY4108-8CC 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}}