{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6250-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6250-6","canonicalUrl":"https://aoctrl.com/siemens/5SY6250-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6250-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6250-6, 2-pole miniature circuit breaker, B-curve, 50 A at 35 °C, 400 V AC, 6 kA (EN 60898) / 10 kA (IEC 60947-2).","salesMarkdown":"The Siemens 5SY6250-6 is a 2-pole miniature circuit breaker from the SENTRON family, rated 50 A at 35 °C with a B tripping characteristic (instantaneous trip between 3 and 5 times rated current). The B-curve means it clears short-circuit faults fast enough to protect cable runs and resistive loads, but it will nuisance-trip on moderate inrush from motor or transformer loads — this is the curve to pick for general-purpose lighting, distribution, and control circuits, not for heavy inductive starts. ## Breaking capacity and what it means for coordination ## Thermal derating and ambient range 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 55 °C to 43.75 A. Operating ambient range spans -40 °C to 75 °C, with humidity limits of 95% up to 55 °C, 55% up to 70 °C, and 35% at 75 °C. The -40 °C floor covers cold storage or unheated outdoor enclosures; the 75 °C ceiling is above typical panel ambient but allows for localized hot spots near the breaker. The part is halogen-free and silicon-free, which simplifies compliance documentation for RoHS and REACH declarations.","metaTitle":"Siemens 5SY6250-6 SENTRON MCB, 2-Pole B-Curve 50A 400V","metaDescription":"Siemens 5SY6250-6 SENTRON miniature circuit breaker, 2-pole, B-curve, 50A at 35°C, 400V AC, 6kA/10kA breaking capacity. Active production, sourced to order. IP20, -40 to 75°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY6250-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 6kA, 2-pole, B, 50 A, D=70 mm","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":"400 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","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","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":"6 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"10 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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/89be2cb20c9010920e6c32028030b3cf.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=160570&mlfb=5SY6250-6"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY6250-6?","answer":"Rated breaking capacity is 6 kA per EN 60898 and 10 kA per IEC 60947-2 at 400 V AC."},{"question":"What is the closest alternative to 5SY6250-6 in the SENTRON family?","answer":"Within the SENTRON 5SY series, the closest alternative would be a 2-pole B-curve MCB at a different current rating — for example the 5SY6206-6 (20 A) or 5SY6326-6 (32 A) — but no direct pin-compatible substitute for the 50 A rating exists within the same series; the 5SY6250-6 is the specific 50 A variant."},{"question":"Where can I buy 5SY6250-6?","answer":"The 5SY6250-6 is sourced and quoted to order against an RFQ through independent distribution channels; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6250-6","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/5SY6250-6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}