{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8250-8BB08","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8250-8BB08","canonicalUrl":"https://aoctrl.com/siemens/5SY8250-8BB08","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8250-8BB08","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8250-8BB08 miniature circuit breaker, 2-pole, 50 A, D tripping characteristic, 20 kA breaking capacity at 400 V AC, only magnetic tripping.","salesMarkdown":"The Siemens SENTRON 5SY8250-8BB08 is a 2-pole miniature circuit breaker rated 50 A with a D tripping characteristic and a 20 kA breaking capacity at 400 V AC per IEC 60947-2. It uses only magnetic tripping — no thermal bimetal — so it's built for loads with high inrush, like motor starters or transformers, where a standard B- or C-curve would nuisance-trip on startup. The D-curve (10–20× In magnetic trip) handles motor inrush that can hit 8–12× FLA for 100–200 ms; a C-curve (5–10× In) would trip on that same transient. Ambient temperature range is -40 to 75 °C, with derating for humidity (95% at 55 °C, down to 35% at 75 °C). Siemens lists it for mechanical engineering and industry applications — think machine tool cabinets, conveyor drive panels, or pump control stations where a magnetic-only breaker gives fast, repeatable short-circuit protection without thermal drift.","metaTitle":"Siemens 5SY8250-8BB08 SENTRON MCB, 2P 50A D-Curve, 20kA","metaDescription":"Siemens SENTRON 5SY8250-8BB08 miniature circuit breaker, 2-pole, 50 A, D tripping characteristic, 20 kA breaking capacity at 400 V AC. Active production, sourced to order.","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","at AC / rated value":"50 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"Only magnetic tripping operation","according to EN 61346-2":"F","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","Product Feature / Touch Protection":"Yes","according to IEC 60947-2 / rated value":"20 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","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","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2d57aaf8bd1646e94803a86faa2b69f0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=515530&mlfb=5SY8250-8BB08","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8250-8BB08/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY8250-8BB08?","answer":"It is rated 20 kA at 400 V AC according to IEC 60947-2."},{"question":"What is the tripping characteristic of this MCB?","answer":"It has a D tripping characteristic (magnetic-only operation), meaning it trips at 10–20 times rated current, suited for high-inrush loads."},{"question":"Where can I buy 5SY8250-8BB08?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8250-8BB08","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/5SY8250-8BB08 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}}