{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8514-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8514-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8514-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8514-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8 series, miniature circuit breaker (MCB), 2-pole 1P+N, tripping characteristic C, rated current 0.3 A, breaking capacity 70 kA at 400 V AC per IEC 60947-2.","salesMarkdown":"The C-curve magnetic trip operates at 5-10× rated current, so it holds through the 50-100 ms magnetizing inrush of a small transformer while still clearing a hard short. ## Breaking capacity and application context At DC per the same standard it is 15 kA, and under UL 1077 / CSA C22.2 No. 235 it is 5 kA. The UL/CSA figure is lower because those standards test at a different fault profile; if the panel requires UL 1077 listing, the 5 kA rating governs the maximum available fault current at the breaker's line side. The quick-assembly fastening system snaps onto the rail without tools and releases via a screwdriver slot. ## Thermal performance and derating Rated 0.3 A at 45 °C ambient. At 50 °C the continuous current derates to 0.29 A, and at 55 °C to 0.28 A. The breaker can operate in ambient up to 75 °C, but humidity must be controlled — max 95 % RH at 55 °C, dropping to 35 % at 75 °C. Minimum ambient is -40 °C, so it handles cold storage or unheated enclosures. The thermal-magnetic element is sealed and halogen-free, silicon-free — no outgassing concerns in clean-room or sealed-panel applications.","metaTitle":"Siemens 5SY8514-7 SENTRON MCB, 2-pole C-curve 0.3 A, 70 kA","metaDescription":"Siemens 5SY8514-7 SENTRON miniature circuit breaker, 2-pole 1P+N, C characteristic, 0.3 A rated current, 70 kA breaking capacity at 400 V AC. Active production, sourced to order ag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY8514-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230 V D=70 mm 25 kA according to EN 60947-2, 1P+N, C0.3","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","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":"0.3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"0.3 A","at 50 °C / rated value":"0.29 A","at 55 °C / rated value":"0.28 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"70 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":"Yes","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"250 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/087491023fa178bd668153b3cddd6a1c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=534918&mlfb=5SY8514-7"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY8514-7?","answer":"Submit an RFQ through the storefront. The part is sourced to order through independent distribution; pricing and stock status are confirmed at quote time."},{"question":"What is 5SY8514-7's listed depth?","answer":"Depth is 76 mm; installation depth is 70 mm."},{"question":"What is 5SY8514-7's listed width?","answer":"Width is 36 mm, which corresponds to 2 modular width units on a standard DIN rail."},{"question":"What compliance documentation does this brand provide for 5SY8514-7?","answer":"The breaker is halogen-free and silicon-free, and is rated per IEC 60947-2, UL 1077, and CSA C22.2 No. 235. The SENTRON series typically carries CE, UKCA, and EAC markings, though specific certs should be confirmed on the nameplate or via the manufacturer's declaration of conformity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8514-7","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/5SY8514-7 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}}