{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8108-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8108-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8108-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8108-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8108-8, 1-pole miniature circuit breaker, D tripping characteristic, 40 kA at 400 V AC (IEC 60947-2), 15 kA at 60 V DC, 18 mm width, IP20.","salesMarkdown":"Rated 40 kA at 400 V AC per IEC 60947-2 and 15 kA at 60 V DC, it handles substantial fault current without cascading upstream. The DC rating of 15 kA at 60 V matters if you are protecting a DC bus or control supply; note the maximum DC operating voltage is 72 V. Under UL 1077 the same part carries a 5 kA interrupting rating — a different standard, so check your local code requirement. The D curve means the magnetic trip threshold sits between 10× and 20× the rated current, so it ignores the brief inrush of a motor or transformer but clears a hard short fast. At 18 mm wide (1 MW), this MCB occupies a single position on a DIN rail. The quick-assembly fastening method means it clips on and off without tools — handy for panel rework or field swap. Mounting position is any orientation, so you are not forced to keep it upright. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) covers normal industrial machinery vibration without loosening connections.","metaTitle":"Siemens 5SY8108-8 SENTRON MCB, D Curve, 1P, 40 kA IEC","metaDescription":"Siemens 5SY8108-8 SENTRON miniature circuit breaker, 1-pole, D tripping characteristic, 40 kA at 400 V AC per IEC 60947-2, 15 kA at 60 V DC. Current lifecycle, sourced to order. IP","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":"5SY8108-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2 / UL1077","description":"Circuit breaker 230/400 V D=70 mm 25 kA according to EN 60947-2, 1P, D8","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","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to IEC 60947-2 rated value":"40 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","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"0.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/493e749a686c5af195c9dfd10eb89f35.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=119191&mlfb=5SY8108-8"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY8108-8?","answer":"Submit an RFQ for your quantity. Pricing and availability are confirmed at quote time through independent distribution channels."},{"question":"What is 5SY8108-8's listed depth (76 mm) on this component line?","answer":"The 5SY8108-8 has a depth of 76 mm, with an installation depth of 70 mm. Width is 18 mm (1 modular unit), height is 90 mm."},{"question":"What compliance documentation does this brand provide for 5SY8108-8?","answer":"The 5SY8108-8 is certified to IEC / EN 60947-2 and UL 1077. It is halogen-free and silicon-free. The manufacturer provides standard compliance documentation including RoHS and REACH declarations."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8108-8","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/5SY8108-8 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}}