{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4250-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4250-6","canonicalUrl":"https://aoctrl.com/siemens/5SL4250-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4250-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4250-6, 2-pole miniature circuit breaker, B-curve, 50 A, 400 V AC, 10 kA breaking capacity per EN 60898, 2 MW units.","salesMarkdown":"The Siemens 5SL4250-6 is a SENTRON miniature circuit breaker — 2-pole, B-curve, rated 50 A at 400 V AC, with a 10 kA breaking capacity certified to both EN 60898 and IEC 60947-2. The B-curve means it trips magnetically between 3 and 5 times rated current — so a 50 A unit holds through a 150 A inrush but opens by 250 A, which suits resistive and general-purpose loads where motor-starting surges aren't the concern. At 40 °C ambient the continuous rating derates to 46.19 A; at 55 °C it drops to 39.81 A, so if the breaker lives in a warm enclosure, size up accordingly. The 2-pole design switches both phase conductors simultaneously. Frequency is 50/60 Hz. ## Panel integration — DIN rail fit and spacing Mounting position is any — vertical, horizontal, or upside-down — no derating required for orientation. Sealable means the toggle can be locked in the OFF position with a padlock hasp — useful for lockout/tagout during maintenance. ## Lifecycle and sourcing — active, no end-of-life signal The 5SL4250-6 carries a current lifecycle stage — no phase-out notice, no last-time-buy date on record. This is a standard SENTRON catalog item, not a niche or legacy variant. For BOM freeze or long-term projects, the risk of an unplanned EOL is low; the SENTRON 5SL series has broad installed base and active support from Siemens.","metaTitle":"Siemens 5SL4250-6 SENTRON MCB, 2P B 50A 400V 10kA","metaDescription":"Siemens 5SL4250-6 SENTRON miniature circuit breaker, 2-pole, B-curve, 50 A, 400 V AC, 10 kA breaking capacity per EN 60898. Active production. Sourced to order via RFQ.","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","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","at AC / rated value":"50 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Energy Limitation Class":"3","according to EN 61346-2":"F","at 30 °C / rated value":"50 A","at 40 °C / rated value":"46.19 A","at 45 °C / rated value":"44 A","at 55 °C / rated value":"39.81 A","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"B","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","according to IEC 60947-2 / rated value":"10 kA","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","with multi-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/0b21f19fe80e41901ece3721f2bd71bd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=122451&mlfb=5SL4250-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4250-6/alternatives.json"},"ai":{"faq":[{"question":"Will the 5SL4250-6 drop into a panel designed for a 5SL6550-7BB?","answer":"No — the 5SL6550-7BB is a different pole count and curve. The 5SL4250-6 is a 2-pole B-curve 50 A unit; the 5SL6550-7BB is a different variant. Check your panel's wiring diagram for the correct pole and curve before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4250-6","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/5SL4250-6 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}}