{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4450-6KK11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4450-6KK11","canonicalUrl":"https://aoctrl.com/siemens/5SY4450-6KK11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4450-6KK11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4450-6KK11 miniature circuit breaker, 4-pole, 50 A rated current, B tripping characteristic, breaking capacity 10 kA per EN 60898 / 15 kA per IEC 60947-2, 4 modular width units.","salesMarkdown":"It carries a breaking capacity of 10 kA per EN 60898 and 15 kA per IEC 60947-2, meaning it can safely interrupt fault currents up to those levels in a 4P configuration. ## Derating and thermal limits The 50 A rating holds at 35 °C ambient. Above that, the breaker derates: 48 A at 40 °C, 47 A at 45 °C, 45.95 A at 50 °C, 44.9 A at 55 °C, and 43.8 A at 60 °C. The full operating range is -40 to 75 °C, so it handles cold starts in unheated plant rooms. Installation depth is 70 mm; the overall depth including terminals is 76 mm. Mounting position is any — vertical, horizontal, upside-down — which helps when the panel layout is tight. IP20 with connected conductors; finger-safe terminals with touch protection are standard.","metaTitle":"Siemens 5SY4450-6KK11 SENTRON MCB, 4P, 50 A, B Curve","metaDescription":"Siemens SENTRON 5SY4450-6KK11 miniature circuit breaker, 4-pole, 50 A, B characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2). Active lifecycle, sourced to order. IP20, -40 to 75","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","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","Design Of The Product":"For railway applications","Number Of Poles / Note":"4P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"50 A","at 40 °C / rated value":"48 A","at 45 °C / rated value":"47 A","at 50 °C / rated value":"45.95 A","at 55 °C / rated value":"44.9 A","at 60 °C / rated value":"43.8 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"B","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"15 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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=89016&mlfb=5SY4450-6KK11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4450-6KK11/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY4450-6KK11?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of 5SY4450-6KK11?","answer":"10 kA per EN 60898 and 15 kA per IEC 60947-2. The higher IEC figure applies for industrial panel coordination; the EN figure covers the standard household/commercial installation."},{"question":"What compliance documentation does this brand provide for 5SY4450-6KK11?","answer":"As a Siemens SENTRON product, it carries CE marking, meets IEC/EN 60898-1 and IEC 60947-2, is halogen-free and silicon-free, and is designed for railway applications. RoHS and REACH declarations are standard from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4450-6KK11","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/5SY4450-6KK11 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}}