{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4250-8FA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4250-8FA","canonicalUrl":"https://aoctrl.com/siemens/5SY4250-8FA","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4250-8FA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4250-8FA miniature circuit breaker, D characteristic, 50 A, 2-pole, 10 kA at 440 V AC, 36 mm wide.","salesMarkdown":"The Siemens 5SY4250-8FA is a 2-pole SENTRON miniature circuit breaker with a D tripping characteristic, rated 50 A at 35 °C and 440 V AC. It's listed for mechanical engineering and industrial environments, with IP20 protection once conductors are connected. The 50 A rating holds at 35 °C; above that, it derates — 47.6 A at 40 °C, 46.35 A at 45 °C, 45.1 A at 50 °C, 43.75 A at 55 °C. If your panel ambient runs warm, size the load accordingly. The breaker is sealable and halogen-free, which simplifies compliance documentation for food-and-bev or clean-room builds. ## Mounting and Integration Notes Mounts in any position — vertical, horizontal, upside down — without derating. No neutral pole switching; this is a straight 2-pole live-only breaker.","metaTitle":"Siemens 5SY4250-8FA SENTRON MCB, 50 A, D Curve, 2-Pole","metaDescription":"Siemens 5SY4250-8FA SENTRON miniature circuit breaker, 50 A rated, D tripping characteristic, 2-pole, 10 kA breaking capacity at 440 V AC. Active production, sourced to order.","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","title":"5SY4250-8FA","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 2-pole, 50 A, D=70 mm as counter preliminary miniature circuit breaker","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","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","at AC / rated value":"50 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"As automatic meter","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","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","according to EN 60898 / rated value":"10 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","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","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/5d2e444a00d1e1aeb2ea8be05bea44ec.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=413977&mlfb=5SY4250-8FA"},"ai":{"faq":[{"question":"Where can I buy 5SY4250-8FA and get a price?","answer":"This part 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 depth of 5SY4250-8FA?","answer":"The depth is 76 mm, with an installation depth of 70 mm behind the DIN rail."},{"question":"What is the width of 5SY4250-8FA?","answer":"The width is 36 mm, which corresponds to 2 modular width units on a standard DIN rail."},{"question":"What compliance documentation is available for 5SY4250-8FA?","answer":"The breaker is halogen-free and silicon-free, which helps with RoHS and REACH compliance. It carries an EN 60898 rating for breaking capacity. Specific UL or IEC documentation should be confirmed at order time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4250-8FA","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/5SY4250-8FA 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}}