{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4350-7KK11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4350-7KK11","canonicalUrl":"https://aoctrl.com/siemens/5SY4350-7KK11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4350-7KK11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4350-7KK11 miniature circuit breaker, 3-pole, C-curve, 50 A rated, 10 kA breaking capacity per EN 60898, 15 kA per IEC 60947-2.","salesMarkdown":"## What this MCB carries and where it fits The Siemens 5SY4350-7KK11 is a SENTRON miniature circuit breaker rated 50 A at AC, with a C tripping characteristic that handles moderate inrush — typical for motor-starter and lighting panels in mechanical engineering and industrial environments. Three poles, 3 modular width units (54 mm wide), and a depth of 76 mm (70 mm installation depth) mean it occupies standard DIN-rail space; the quick-assembly fastening and any mounting position let a wireman slot it into a crowded gland plate without rework. Pollution degree 3 and overvoltage category III suit it for fixed installations inside a panel where the environment isn't climate-controlled. ## Breaking capacity and temperature derating Rated 10 kA per EN 60898 and 15 kA per IEC 60947-2 — the higher figure under the industrial standard gives SCCR headroom for a panel fed from a transformer with moderate fault current. The C-curve trips between 5× and 10× In, so it won't nuisance-trip on capacitor or motor-start inrush but clears a hard short fast. Temperature derating is documented: 50 A at 35 °C, 48 A at 40 °C, 45.95 A at 50 °C, 43.8 A at 60 °C. If the panel ambient runs hot, the effective ampacity drops; a site electrical engineer should check the thermal curve before loading to 50 A in a sealed enclosure.","metaTitle":"Siemens 5SY4350-7KK11 SENTRON MCB, 50A 3P C-Curve, 10kA","metaDescription":"Siemens 5SY4350-7KK11 SENTRON miniature circuit breaker, 50A rated, 3-pole, C characteristic, 10kA IEC 60898 / 15kA IEC 60947-2. Active production, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"54 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"3","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":"3P","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":"3","Tripping Characteristic Class":"C","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=227397&mlfb=5SY4350-7KK11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4350-7KK11/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY4350-7KK11?","answer":"Sourced to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is the breaking capacity of 5SY4350-7KK11?","answer":"10 kA per EN 60898 and 15 kA per IEC 60947-2. The higher figure under the industrial standard governs SCCR coordination."},{"question":"What compliance documentation is available for 5SY4350-7KK11?","answer":"The part carries IEC 60898 and IEC 60947-2 ratings, is halogen-free and silicon-free, and is designed for railway applications — documentation typically includes CE, UKCA, and EAC declarations per the SENTRON series. RoHS and REACH compliance is standard for Siemens industrial MCBs."},{"question":"Will 5SY4350-7KK11 drop into a panel specified with 5SY4304-7CV?","answer":"Same SENTRON 5SY series, same 3-pole C-curve footprint (3 MW, 54 mm wide). The 5SY4350-7KK11 is the 50 A variant; 5SY4304-7CV is a lower-current sibling. No rewiring needed if the panel bus and load side are rated for 50 A — just verify the cable and upstream protection are sized accordingly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4350-7KK11","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/5SY4350-7KK11 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}}