{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4450-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4450-7","canonicalUrl":"https://aoctrl.com/siemens/5SY4450-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4450-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4450-7, 4-pole miniature circuit breaker, 50 A rated, C tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 4 MW wide.","salesMarkdown":"It switches and protects final circuits in commercial and industrial panels — motor starters, lighting distribution, control transformers — where the inrush from inductive or capacitive loads would nuisance-trip a B-curve device. ## Breaking capacity and dual-standard rating This breaker carries two interrupting ratings: 10 kA per EN 60898-1 and 15 kA per IEC 60947-2 / UL1077. The higher 15 kA figure applies when the part is specified as a circuit breaker for industrial control panels (IEC 60947-2); the 10 kA rating covers the same part used as a domestic-style MCB (EN 60898). For a 50 A 4-pole breaker on a 400 V supply with a transformer impedance of 4–5%, the prospective fault current at the panelboard typically lands between 6 and 12 kA — the 15 kA IEC rating gives headroom without stepping up to a larger frame. ## Panel fit and environmental tolerance Mounts in any position. Sealed with a lockable cover (sealable: yes). Rated IP20 with conductors connected — fine inside a locked panel, not for washdown zones. Ambient range -40 °C to 75 °C, with a derating curve starting at 35 °C: 50 A at 35 °C, 48 A at 40 °C, 45.95 A at 50 °C, 43.8 A at 60 °C. Halogen-free and silicon-free construction.","metaTitle":"Siemens 5SY4450-7 SENTRON MCB, 50 A, 4P, C-Curve, 10/15 kA","metaDescription":"Siemens 5SY4450-7 SENTRON 4-pole MCB, 50 A rated, C tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2). Current production. Sourced to order. Quoted on request.","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","Energy Limitation Class":"3","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":"C","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":"3.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/04eb27a1b1eafad23f99dfffd3ff5ffa.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=109773&mlfb=5SY4450-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4450-7/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4450-7?","answer":"10 kA per EN 60898-1 and 15 kA per IEC 60947-2 / UL1077 — the higher figure applies when the breaker is used in industrial control-panel applications."},{"question":"Will 5SY4450-7 drop into a panel specified around 5SY4140-7?","answer":"Yes — both are 4-module-width (72 mm) SENTRON breakers with the same DIN-rail footprint, depth, and terminal layout. The 5SY4450-7 is the 50 A C-curve variant; the 5SY4140-7 is a 40 A C-curve. No rewiring or panel rework needed if the busbar and conductor sizing already support 50 A."},{"question":"Where can I buy 5SY4450-7 and how is it quoted?","answer":"Sourced to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time, not listed here."},{"question":"What compliance documentation does Siemens provide for 5SY4450-7?","answer":"The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL1077. It is halogen-free and silicon-free. Full RoHS, REACH, and UL documentation is available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4450-7","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/5SY4450-7 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}}