{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7108-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7108-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7108-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7108-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7108-8, 1-pole miniature circuit breaker, D tripping characteristic, 8 A rated current (35 °C), 15 kA (EN 60898) / 30 kA (IEC 60947-2) breaking capacity, 400 V AC, 50/60 Hz.","salesMarkdown":"The Siemens SENTRON 5SY7108-8 is a 1-pole miniature circuit breaker with D-curve tripping, rated 8 A at 35 °C and 400 V AC. It provides 15 kA breaking capacity per EN 60898 and 30 kA per IEC 60947-2, with a DC rating of 15 kA per IEC 60947-2. That 30 kA IEC figure gives you headroom for high-fault industrial panels where the utility transformer is close — the EN rating is the standard residential/commercial floor, but the IEC rating is what matters for selectivity studies in an industrial distribution board. At 8 A, this is sized for a small motor circuit or a control transformer primary, not a main feeder. ## Panel fit & environment Occupies 1 modular width unit (18 mm) on DIN rail. Mount in any position; fastens via the quick-assembly system (snap-on). IP20 with connected conductors — enclosed in a panel, not open-terminal. Current derates above 35 °C: 7.26 A at 45 °C, 6.99 A at 50 °C, 6.72 A at 55 °C, 6.43 A at 60 °C. If your panel ambient runs 50 °C, plan for the 7 A effective rating, not the 8 A nameplate. Halogen-free and silicon-free construction — important for clean-room or semiconductor-adjacent installations where outgassing contaminates processes. Sealable (can be locked in OFF position for LOTO). Touch-protected terminals. Combined terminal top and bottom accept standard wiring. Rated for mechanical engineering/industrial operation per the suitability listing. The part carries designations per IEC 81346-2 and DIN EN 61346-2 (function code F).","metaTitle":"Siemens 5SY7108-8 SENTRON MCB, 1P D 8A, 15/30 kA","metaDescription":"Siemens 5SY7108-8 SENTRON miniature circuit breaker, 1-pole, D-curve, 8 A at 35 °C, 15 kA (EN 60898) / 30 kA (IEC 60947-2) breaking capacity, 400 V AC. Active production, sourced t","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY7108-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230/400 V 15kA, 1-pole, D, 8A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","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":"1P","acc. to DIN EN 61346-2":"F","at 35 °C / rated value":"8 A","at 45 °C / rated value":"7.26 A","at 50 °C / rated value":"6.99 A","at 55 °C / rated value":"6.72 A","at 60 °C / rated value":"6.43 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":"15 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"30 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":"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 (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/be71764299588e4784fb670f1376fee1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=45708&mlfb=5SY7108-8"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SY7108-8?","answer":"15 kA per EN 60898 and 30 kA per IEC 60947-2 at 400 V AC. DC rating is 15 kA per IEC 60947-2."},{"question":"What is the difference between the 5SY7108-8 and the 5SY7140-8CC?","answer":"The 5SY7140-8CC is a 4-pole version at 40 A; the 5SY7108-8 is 1-pole at 8 A. They share the same SENTRON platform and DIN-rail footprint per pole, but the 5SY7140-8CC occupies 4 modular width units and carries a higher current rating. A panel wired for the 5SY7140-8CC would need rewiring to use the 5SY7108-8 — different pole count, different ampacity."},{"question":"Where can I buy the 5SY7108-8?","answer":"Sourced and quoted to order against an RFQ through independent distribution. 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/5SY7108-8","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/5SY7108-8 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}}