{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8103-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8103-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8103-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8103-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8103-8, miniature circuit breaker, D characteristic, 1-pole, 400 V AC / 60 V DC, 50 kA IEC 60947-2, 18 mm width, halogen-free.","salesMarkdown":"## What the ratings mean for fit The 5SY8103-8 is a Siemens SENTRON single-pole miniature circuit breaker with a D tripping characteristic, meaning it's designed for loads with high inrush currents — typically motor starters, transformers, or welding equipment where the starting surge exceeds the magnetic trip threshold of a B or C curve breaker. The 50 kA interrupting capacity at 400 V AC per IEC 60947-2 tells you it can safely clear a fault up to that level without cascading upstream, which is critical for panel coordination in industrial distribution. On the DC side, it's rated 15 kA at 60 V (72 V max), so it handles battery-backed or rectified circuits within that envelope. The 18 mm width (1 modular unit) snaps onto standard DIN rail and mounts in any position, which simplifies panel layout when you're stacking multiple poles for three-phase or split-phase applications. ## Environmental and compliance The breaker is halogen-free and silicon-free, which matters for panels in clean-room or semiconductor-adjacent environments where outgassing can contaminate optics or sensitive contacts. The housing carries IP20 protection with connected conductors, standard for enclosed distribution boards. Pollution degree 3 and overvoltage category III ratings confirm it's suited for fixed industrial installations where transient overvoltages from the mains are expected. Vibration resistance per IEC 60068-2-6 covers ±1 mm displacement at 5 to 25 Hz and 50 m/s² acceleration at 25 to 150 Hz — within tolerance for machine-mounted panels on pumps or conveyors.","metaTitle":"Siemens 5SY8103-8 SENTRON MCB, D Curve, 1P, 50 kA IEC","metaDescription":"Siemens 5SY8103-8 SENTRON miniature circuit breaker, D tripping characteristic, 1 pole, 50 kA interrupting capacity per IEC 60947-2. Active production, sourced to order.","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":"5SY8103-8","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, D3","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":"50 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":"1.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/26174c2cfb77a02e76e1840d2e446618.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=342341&mlfb=5SY8103-8"},"ai":{"faq":[{"question":"Who supplies 5SY8103-8 and how is it quoted for volume purchases?","answer":"The 5SY8103-8 is sourced and quoted to order through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time against an RFQ — no stock or price figures are published here."},{"question":"What compliance documentation does Siemens provide for 5SY8103-8?","answer":"The breaker is certified to IEC / EN 60947-2 and UL1077. It is halogen-free and silicon-free. Full RoHS and REACH declarations are available from the manufacturer's documentation portal."},{"question":"What is 5SY8103-8's listed depth (76 mm) on this component line?","answer":"The total depth is 76 mm; the installation depth behind the panel face is 70 mm. The 18 mm width occupies one modular unit on DIN rail."},{"question":"Will 5SY8103-8 drop into a panel specified around 5SY7206-7CC without rewiring?","answer":"Both are 1-pole SENTRON MCBs on the same 18 mm DIN-rail footprint, so the mechanical swap is straightforward. The key difference is the tripping characteristic: the 5SY8103-8 uses a D curve (10–20× In magnetic trip), while the 5SY7206-7CC uses a different characteristic. Verify the existing panel's coordination study supports the D curve before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8103-8","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/5SY8103-8 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}}