{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8550-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8550-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8550-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8550-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8550-8, miniature circuit breaker, 2-pole 1P+N, D-curve, 50 A rated current, 20 kA breaking capacity acc. to IEC 60947-2, IP20, 2 MW.","salesMarkdown":"Its D tripping characteristic — 10 to 20 times rated current — is sized for high-inrush loads: motor starters, transformers, or welding equipment where a B- or C-curve would nuisance-trip on startup. The 50 A rating at 45 °C (48.75 A at 50 °C, 47.45 A at 55 °C) means you size the breaker for the actual ambient in the enclosure, not the nameplate. Breaking capacity is 20 kA per IEC 60947-2 (15 kA DC, 5 kA per UL 1077/CSA C22.2 No. 235) — enough for most industrial panelboards with a 10 kA or higher available fault current at 400 V. Rated per IEC 60947-2 and UL 1077/CSA C22.2 No. 235. Halogen-free and silicon-free construction. Sealable for lockout/tagout. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.","metaTitle":"Siemens 5SY8550-8 SENTRON MCB, 2-pole D-curve 50A, 20kA IC","metaDescription":"Siemens 5SY8550-8 SENTRON miniature circuit breaker, 2-pole 1P+N, D-curve 50A, 20 kA IEC breaking capacity, IP20. Active production, sourced to order.","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":"50 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":"50 A","at 50 °C / rated value":"48.75 A","at 55 °C / rated value":"47.45 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":"20 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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=491075&mlfb=5SY8550-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8550-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY8550-8 and how do I get a price?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is 5SY8550-8's breaking capacity?","answer":"20 kA per IEC 60947-2 at AC, 15 kA DC per IEC 60947-2, and 5 kA per UL 1077/CSA C22.2 No. 235."},{"question":"What compliance documentation does Siemens provide for 5SY8550-8?","answer":"The breaker carries IEC 60947-2 and UL 1077/CSA C22.2 No. 235 ratings. It is halogen-free and silicon-free, sealable, and vibration-tested per IEC 60068-2-6."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8550-8","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/5SY8550-8 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}}