{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4203-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4203-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4203-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4203-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4203-8 miniature circuit breaker, 2-pole, D tripping characteristic, 10 kA (EN 60898) / 35 kA (IEC 60947-2).","salesMarkdown":"## Ratings and environment The 5SY4203-8: Rated operational voltage is 400 V AC single-phase or 440 V AC multi-phase; DC rating is 60 V (72 V max). Ambient temperature range is -40 to 75 °C, with constraints on relative humidity: 95% up to 55 °C, derating to 35% at 75 °C. Vibration resistance per IEC 60068-2-6 is ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz. The enclosure is rated IP20 with conductors connected, halogen-free and silicon-free. Overall dimensions: height 90 mm, width 36 mm, depth 76 mm. Installation depth is 70 mm. The combined terminal at top and bottom accepts conductors for easy ring or fork lug connections. Sealable with a locking device to prevent unauthorized switching. ## Sourcing This breaker is a current-production item (lifecycle stage: current). No last-time-buy or successor notice applies.","metaTitle":"Siemens 5SY4203-8 SENTRON MCB, 2P, D Curve, 10kA","metaDescription":"Siemens SENTRON 5SY4203-8 2-pole miniature circuit breaker, D tripping characteristic. Rated 10 kA per EN 60898-1; 35 kA per IEC 60947-2. Active production, sourced to order agains","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY4203-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 10kA, 2-pole, D, 3 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","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":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"35 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":"$22.86","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/985ab543cd55b73e96cbfea5cb2766f8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=28749&mlfb=5SY4203-8"},"ai":{"faq":[{"question":"What compliance standards does it meet?","answer":"It is designed to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. Additionally, it is halogen-free and silicon-free, with IP20 protection when conductors are connected."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4203-8","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/5SY4203-8 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}}