{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7303-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7303-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7303-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7303-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7303-8, D-curve miniature circuit breaker, 3-pole, 15 kA (EN 60898) / 40 kA (IEC 60947-2), 400 V AC, 60 V DC.","salesMarkdown":"The Siemens 5SY7303-8 is a SENTRON miniature circuit breaker (MCB) with a D tripping characteristic, three poles, and a rated short-circuit capacity of 15 kA per EN 60898-1 or 40 kA per IEC 60947-2. The 40 kA rating under 60947-2 gives you headroom for industrial panels with high available fault current; the 15 kA EN rating covers the residential and light commercial path. It's rated for 400 V AC (440 V max in multi-phase or single-phase operation) and 60 V DC (72 V max). ## Where it lives in the panel Depth is 76 mm (70 mm installation depth). Combined terminals top and bottom simplify busbar or ring-tongue wiring. Dual-rated to IEC / EN 60898-1 and IEC / EN 60947-2, plus UL 1077 and CSA C22.2 No. 235 (5 kA at AC). Halogen-free and silicon-free construction, which matters for outgassing-sensitive environments like clean rooms or sealed enclosures. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — it holds up on a machine frame or in a mobile installation.","metaTitle":"Siemens 5SY7303-8 SENTRON MCB, D-curve 3P 15kA/40kA","metaDescription":"Siemens 5SY7303-8 SENTRON miniature circuit breaker, D-curve, 3-pole, 15 kA (EN 60898) / 40 kA (IEC 60947-2). Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY7303-8","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 15kA, 3-pole, D, 3 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","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":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"15 kA","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":"1.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/397f44225dff8fb90911d14c8ebfe483.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=416933&mlfb=5SY7303-8"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY7303-8?","answer":"We source and quote the 5SY7303-8 against an RFQ; availability and current pricing are confirmed at quote time."},{"question":"What are the key ratings of 5SY7303-8?","answer":"D-curve, 3-pole, 15 kA (EN 60898) / 40 kA (IEC 60947-2), 400 V AC, 60 V DC."},{"question":"What compliance documentation does this brand provide for 5SY7303-8?","answer":"The 5SY7303-8 carries approvals to IEC / EN 60898-1, IEC / EN 60947-2, UL 1077, and CSA C22.2 No. 235. It is halogen-free and silicon-free."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7303-8","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/5SY7303-8 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}}