{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4250-6KK11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4250-6KK11","canonicalUrl":"https://aoctrl.com/siemens/5SY4250-6KK11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4250-6KK11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4250-6KK11, miniature circuit breaker, 2-pole, 50 A, B characteristic, 10 kA per EN 60898 / 15 kA per IEC 60947-2, 36 mm wide, IP20.","salesMarkdown":"## What it is and what it does The Siemens 5SY4250-6KK11 is a 2-pole miniature circuit breaker from the SENTRON series, rated 50 A at AC with a B tripping characteristic. It protects branch circuits against overload and short-circuit, with a breaking capacity of 10 kA per EN 60898 and 15 kA per IEC 60947-2. The B curve means it trips at 3–5 times rated current, making it suitable for resistive and general-purpose loads where inrush is moderate — think lighting, heating, or control transformers, not motor starting. The 36 mm width (2 modular units) snaps onto a DIN rail via the quick assembly system, and it can be mounted in any position. The IP20 rating with connected conductors means it's protected against finger contact but not water ingress — standard for inside a panel. Combined terminals at top and bottom simplify daisy-chaining or busbar feed. ## Ratings and what they mean for fit The 50 A rating is at 35 °C ambient. At 40 °C it derates to 47.6 A, at 50 °C to 45.1 A, and at 60 °C to 42.4 A. If your panel runs hot — common in sealed enclosures or near heat sources — you need to account for the derating curve rather than relying on the nominal 50 A. The breaking capacity tells you the maximum fault current the breaker can safely interrupt. At 10 kA per EN 60898 it covers most residential and light commercial panels. The 15 kA per IEC 60947-2 gives headroom for industrial distribution where fault levels are higher — for example, near a large transformer or in a plant with high short-circuit capacity. Overvoltage category III means it's rated for fixed installation downstream of the main distribution board. Pollution degree 3 means the breaker is designed for conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical in industrial environments. The energy limitation class 3 indicates it limits let-through energy effectively, reducing stress on downstream equipment during a fault.","metaTitle":"Siemens 5SY4250-6KK11 SENTRON MCB, 2P, 50 A, B Curve, 10/15","metaDescription":"Siemens 5SY4250-6KK11 SENTRON miniature circuit breaker, 2-pole, 50 A, B characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 36 mm wide, IP20. Active production. Quoted to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","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":"2P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"50 A","at 40 °C / rated value":"47.6 A","at 45 °C / rated value":"46.35 A","at 50 °C / rated value":"45.1 A","at 55 °C / rated value":"43.75 A","at 60 °C / rated value":"42.4 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","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=88812&mlfb=5SY4250-6KK11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4250-6KK11/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4250-6KK11?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for a firm quote with current pricing and lead time."},{"question":"Will 5SY4250-6KK11 drop into a panel that was specified around 5SY4116-6CC without rewiring?","answer":"Both are SENTRON 2-pole MCBs on a 36 mm footprint, so the mechanical fit is the same. The 5SY4250-6KK11 is a 50 A B-curve, while the 5SY4116-6CC is a 16 A C-curve — the electrical rating is different, so verify the branch circuit load before swapping."},{"question":"What compliance documentation does this brand provide for 5SY4250-6KK11?","answer":"The part carries EN 60898 and IEC 60947-2 ratings for breaking capacity, and is designed for railway applications. It is halogen-free and silicon-free. Specific RoHS/REACH/UL declarations are available from the manufacturer upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4250-6KK11","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/5SY4250-6KK11 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}}