{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8250-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8250-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8250-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8250-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8250-8, 2-pole miniature circuit breaker, D characteristic, 50 A rated current, 20 kA breaking capacity per IEC 60947-2, 440 V AC.","salesMarkdown":"## What this 50 A D-curve MCB does in a panel For DC circuits, the same breaker is rated 15 kA per the same standard. If you're specifying for a UL 489 panel, note the UL 1077 / CSA C22.2 No. 235 rating is 5 kA — that's the listing for supplementary protection, not branch-circuit primary. Check which code cycle governs your install. Thermal derating is published: full 50 A holds at 45 °C ambient, drops to 48.75 A at 50 °C, and 47.45 A at 55 °C. That's a straight line — no surprise roll-off if the panel runs warm. ## DIN-rail fit and wiring Width is 36 mm — two modular units on a standard DIN rail. Mounting position is unrestricted, so you can lay it sideways in a shallow gland plate if needed. IP20 with connected conductors — finger-safe once wired, but not sealed against washdown. Sealable option is present — you can lock the toggle in the off position for lockout/tagout without an external hasp. Touch protection is built in. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz, so it holds up on a machine frame or near a large drive.","metaTitle":"Siemens 5SY8250-8 SENTRON MCB, 2P, D Curve, 50 A, 20 kA","metaDescription":"Siemens 5SY8250-8 SENTRON miniature circuit breaker, 2-pole, D tripping characteristic, 50 A rated current, 20 kA breaking capacity per IEC 60947-2. Active production, sourced to o","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","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","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","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","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"50 A","at 50 °C / rated value":"48.75 A","at 55 °C / rated value":"47.45 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"20 kA","Product Feature / Touch Protection":"Yes","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","Type Of Voltage / Of The Operating Voltage":"AC","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 Component / 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a49c7fe1038f5ebe1f6278903351b319.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=141401&mlfb=5SY8250-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8250-8/alternatives.json"},"ai":{"faq":[{"question":"What is 5SY8250-8's breaking capacity under IEC 60947-2?","answer":"20 kA at 440 V AC for multi-phase operation, and 15 kA for DC circuits under the same standard. For UL 1077 / CSA C22.2 No. 235 supplementary protection, the rating is 5 kA."},{"question":"Will 5SY8250-8 drop into a panel specified around 5SY7210-7CC without rewiring?","answer":"Both are 2-pole SENTRON MCBs on a 36 mm footprint, so the mechanical fit is the same. The key difference is the tripping characteristic: 5SY8250-8 uses a D curve (high inrush tolerance), while 5SY7210-7CC uses a different curve. Verify the load type — if the original design needed a D curve for motor starting, the 5SY8250-8 is a direct functional match. If the original used a B or C curve, the trip coordination changes."},{"question":"What compliance documentation does this brand provide for 5SY8250-8?","answer":"The breaker carries IEC 60947-2 ratings, UL 1077 and CSA C22.2 No. 235 listings, and is designated per IEC 81346-2 and DIN EN 61346-2 as function F. The housing is halogen-free and silicon-free. Standard Siemens SENTRON documentation includes a CE declaration and RoHS/REACH compliance statements — available from the manufacturer or through your distributor upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8250-8","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/5SY8250-8 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}}