{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8520-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8520-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8520-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8520-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8520-8, miniature circuit breaker, 2-pole 1P+N, D tripping characteristic, 20 A rated current, 30 kA breaking capacity per IEC 60947-2, 36 mm width.","salesMarkdown":"Breaking capacity sits at 30 kA per IEC 60947-2 at 50/60 Hz, with a DC rating of 15 kA per the same standard. That 30 kA figure covers most industrial panel fault levels up to the service entrance; the 15 kA DC side handles battery-backed control circuits or DC bus feeds. This is a 2-pole unit configured as 1P+N — it switches both line and neutral, with the neutral pole switching but not protected. The neutral conductor switching feature means you get a single-break isolation on the neutral path, useful in panels where a switched neutral is required by code or machine design. ## Panel fit and derating Temperature derating is published: full 20 A at 45 °C, 19.38 A at 50 °C, 18.74 A at 55 °C. If this breaker lands in a hot panel next to drives or transformers, factor the derating curve into the load calcs. Pollution degree 3, overvoltage category III, vibration resistance per IEC 60068-2-6 (50 m/s² at 25–150 Hz). Rated per IEC 60947-2 (30 kA AC, 15 kA DC) and UL 1077 / CSA C22.2 No. 235 (5 kA). The UL 1077 rating is supplementary protector level — check your panel SCCR study; for branch-circuit protection you need the full IEC 60947-2 rating. Halogen-free and silicon-free construction; sealable with a lockable cover for lockout/tagout.","metaTitle":"Siemens 5SY8520-8 SENTRON MCB, 2-Pole D-Curve 20 A, 30 kA","metaDescription":"Siemens 5SY8520-8 SENTRON miniature circuit breaker, 2-pole 1P+N, D-curve, 20 A rated, 30 kA breaking capacity per IEC 60947-2. Current production. Sourced to order against RFQ.","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","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","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":"20 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":"20 A","at 50 °C / rated value":"19.38 A","at 55 °C / rated value":"18.74 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"30 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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=384372&mlfb=5SY8520-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8520-8/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8520-8","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/5SY8520-8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}