{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4450-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4450-6","canonicalUrl":"https://aoctrl.com/siemens/5SY4450-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4450-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4450-6, 4-pole miniature circuit breaker (MCB), B-characteristic, 50 A rated current at 35 °C, 10 kA breaking capacity per EN 60898, 4 MW DIN-rail mount.","salesMarkdown":"Combined terminal top and bottom accept the same conductor range — no need to stock separate feed-through lugs for the line and load side. ## Breaking capacity and standard compliance Energy limitation class 3 means the let-through energy is low enough to protect downstream cabling and connected loads under most fault conditions — relevant for coordinating with an upstream RCD or main breaker. ## Thermal derating and ambient range Rated 50 A at 35 °C ambient. At 40 °C the continuous current drops to 48 A, at 45 °C to 47 A, and at 55 °C to 44.9 A. The full derating curve runs to 60 °C where the breaker carries 43.8 A. Minimum ambient is -40 °C; maximum is 75 °C. Not intended for high-inrush transformer or motor starting loads; those need C or D curves. Current production stage — no end-of-life notice on record. The 5SY4 series is Siemens' standard 4-pole B-curve offering; no official successor announced.","metaTitle":"Siemens 5SY4450-6 SENTRON 4-Pole MCB, 50 A, 10 kA","metaDescription":"Siemens 5SY4450-6 SENTRON 4-pole MCB, 50 A at 35°C, B-curve, 10 kA (EN 60898) / 15 kA (IEC 60947-2) breaking capacity.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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":"400 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","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":"$639.30","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bed7bd5b19a48138014563915a01270c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=245921&mlfb=5SY4450-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4450-6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy Siemens 5SY4450-6?","answer":"Sourced to order against an RFQ through independent distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4450-6","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/5SY4450-6 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}}