{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4450-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4450-5","canonicalUrl":"https://aoctrl.com/siemens/5SY4450-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4450-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4450-5, 4-pole miniature circuit breaker, 50 A rated, tripping characteristic A, 10 kA (IEC 60898-1) / 15 kA (IEC 60947-2) breaking capacity, 72 mm wide.","salesMarkdown":"The 15 kA rating gives headroom for high-fault installations without cascading upstream. ## Temperature derating — the real-world current you can count on The 50 A rating holds at 35 °C ambient. Above that, derate: 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. If your panel runs warm — typical for a crowded enclosure — size the downstream load against the derated figure, not the 35 °C number. Operating temperature range is -40 °C to 75 °C, with humidity limits: max 95% up to 55 °C, derating to 55% at 70 °C and 35% at 75 °C. ## Lifecycle and sourcing — current production, quoted to order Compliance documentation covers IEC/EN 60898-1 and IEC/EN 60947-2, plus UL1077. Sealable design allows locking the handle position for lockout/tagout procedures.","metaTitle":"Siemens 5SY4450-5 SENTRON MCB, 50 A, 4-Pole, Char A, 10/15 k","metaDescription":"Siemens 5SY4450-5 SENTRON miniature circuit breaker, 50 A rated, 4-pole, tripping characteristic A, 10 kA per IEC 60898-1 / 15 kA per IEC 60947-2. Current production. Sourced to or","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","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"50 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","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","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"A","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"15 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"AC","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"4.5 W"}},"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=324351&mlfb=5SY4450-5","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4450-5/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY4450-5 and how do I get a price?","answer":"The 5SY4450-5 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the breaking capacity of 5SY4450-5?","answer":"10 kA per IEC 60898-1 and 15 kA per IEC 60947-2. The 15 kA rating applies when the breaker is used under the industrial standard, giving additional fault-current headroom."},{"question":"What compliance standards does 5SY4450-5 meet?","answer":"It is certified to IEC/EN 60898-1, IEC/EN 60947-2, and UL1077. The breaker is halogen-free and silicon-free, and is sealable for lockout/tagout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4450-5","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/5SY4450-5 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}}