{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8203-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8203-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8203-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8203-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8203-7, 2-pole miniature circuit breaker, C-curve, 50 kA at 400 V AC (IEC 60947-2), 36 mm wide, 76 mm deep, IP20.","salesMarkdown":"## Siemens SENTRON 5SY8203-7 — 2-Pole C-Curve MCB Mounting position is any, which helps when the panel layout is tight. ## Breaking Capacity & Standards Rated breaking capacity hits 50 kA at 400 V AC under IEC 60947-2, and 15 kA at 60 V DC under the same standard. For UL 1077 applications, it's rated 5 kA. That gap between IEC and UL figures is typical — UL 1077 is a component-level standard with different test conditions. ## Environmental & Mounting The quick assembly system (snap-on DIN rail) and combined top/bottom terminals speed panel wiring. Sealable — useful for lockout/tagout compliance. Vibration resistance per IEC 60068-2-6: ±1 mm at 5-25 Hz, 50 m/s² at 25-150 Hz.","metaTitle":"Siemens SENTRON 5SY8203-7 MCB, 2-Pole C-Curve, 50 kA IEC","metaDescription":"Siemens SENTRON 5SY8203-7 miniature circuit breaker, 2-pole, C-curve, 50 kA at 400 V AC per IEC 60947-2. Current lifecycle. Sourced to order via RFQ.","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":"5SY8203-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 2P, C3","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":"C","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":"1.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f2ae8f51aef20ffc09124fbc5752dc51.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=458973&mlfb=5SY8203-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY8203-7?","answer":"50 kA at 400 V AC per IEC 60947-2, 15 kA at 60 V DC per the same standard, and 5 kA per UL 1077."},{"question":"Where can I buy 5SY8203-7 and how is it quoted?","answer":"Sourced to order through independent distribution against an RFQ. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here."},{"question":"What compliance documentation does Siemens provide for 5SY8203-7?","answer":"The breaker carries IEC/EN 60947-2 and UL 1077 approvals. It is halogen-free and silicon-free. Full RoHS/REACH declarations are available from the manufacturer on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8203-7","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/5SY8203-7 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}}