{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8303-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8303-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8303-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8303-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON series, miniature circuit breaker, order code 5SY8303-7, 3-pole, C-curve, 3 A rated current, 50 kA breaking capacity per IEC 60947-2.","salesMarkdown":"The Siemens SENTRON 5SY8303-7 is a 3-pole miniature circuit breaker (MCB) with a C-tripping characteristic rated at 3 A at 230/400 V AC, 50/60 Hz. Rated current derates with ambient temperature: 3 A at 45 °C, 2.92 A at 50 °C, 2.85 A at 55 °C. In a hot panel — say next to a drive or transformer — the actual continuous load should stay under the derated figure. The 3-module-width footprint (54 mm wide, 90 mm tall, 76 mm deep, 70 mm installation depth) snaps onto standard DIN rail, and the mounting position is any orientation. The 5 kA rating per UL 1077 and CSA C22.2 No. 235 covers North American supplementary protection applications. Vibration resistance per IEC 60068-2-6 (±1 mm at 5 to 25 Hz; 50 m/s² at 25 to 150 Hz) means it holds up on a machine frame or in a mobile equipment panel. Halogen-free and silicon-free construction, sealable, with touch protection and combined top/bottom terminals — no neutral conductor switching on this 3P variant.","metaTitle":"Siemens 5SY8303-7 SENTRON MCB, 3-Pole C-Curve 3A, 50kA","metaDescription":"Siemens 5SY8303-7 SENTRON miniature circuit breaker, 3-pole, C-curve, 3A rated, 50kA breaking capacity per IEC 60947-2. Active production. Sourced 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":"5SY8303-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 3P, C3","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"3","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"3P","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"3 A","at 50 °C / rated value":"2.92 A","at 55 °C / rated value":"2.85 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"3","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"50 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ae2571bf1871bfcbb4d1db4e79b6cce5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=351115&mlfb=5SY8303-7"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY8303-7?","answer":"Submit an RFQ through this listing. The part is sourced and quoted to order through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is 5SY8303-7's breaking capacity per IEC 60947-2?","answer":"Rated 50 kA at AC per IEC 60947-2, and 15 kA at DC per the same standard. For UL 1077 / CSA C22.2 No. 235 applications, the rating is 5 kA."},{"question":"What compliance documentation does Siemens provide for 5SY8303-7?","answer":"The part is rated per IEC 60947-2, UL 1077, and CSA C22.2 No. 235. It's halogen-free and silicon-free. Standard RoHS/REACH declarations are available from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8303-7","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/5SY8303-7 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}}