{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4250-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4250-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4250-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4250-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4250-8, 2-pole miniature circuit breaker, D characteristic, 50 A rated at 30 °C, 10 kA breaking capacity per EN 60898 and IEC 60947-2, 400 V AC.","salesMarkdown":"The 2-pole configuration (2P) switches both phase conductors; neutral conductor switching is not included, so the neutral bar remains continuous through the panel. Mounting position is unrestricted — vertical, horizontal, or inverted — which simplifies layout in crowded enclosures. ## Thermal derating and ambient limits At 40 °C the breaker must be derated to 46.19 A; at 45 °C to 44 A; at 55 °C to 39.81 A. These are per the manufacturer's published curve — panel builders should apply the derating factor for the enclosure's internal temperature rise, not the room ambient. Degree of pollution is 2 (non-conductive pollution that may become conductive due to condensation), which covers most indoor panel environments. Dimensions are 76 mm depth, 36 mm width (2 MW), 90 mm height. Installation depth is 70 mm — the extra 6 mm accounts for the terminal screw clearance behind the DIN rail.","metaTitle":"Siemens 5SL4250-8 SENTRON MCB, 2P, 50 A, D Curve, 10 kA","metaDescription":"Siemens 5SL4250-8 SENTRON miniature circuit breaker, 2-pole, 50 A rated, D tripping characteristic, 10 kA breaking capacity per EN 60898 & IEC 60947-2. Active production. Quoted to","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","Number Of Poles":"2","Type Of Voltage":"AC","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","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","Number Of Poles / Note":"2P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","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","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"+55 °C, max. 95% humidity","with multi-phase operation / at AC / maximum":"440 V","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating 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=500531&mlfb=5SL4250-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4250-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SL4250-8 and get a price?","answer":"The 5SL4250-8 is sourced and quoted to order through independent distribution. Submit an RFQ; availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of the 5SL4250-8?","answer":"The breaking capacity is 10 kA per both EN 60898 and IEC 60947-2 at 400 V AC."},{"question":"What does the D tripping characteristic mean for this breaker?","answer":"The D curve allows inrush currents 10–20 times the 50 A rating before tripping, making it suitable for motor and transformer branch circuits where starting surges would nuisance-trip B or C curve breakers."},{"question":"Does the 5SL4250-8 switch the neutral conductor?","answer":"No, neutral conductor switching is not included. The 2-pole configuration switches both phases; the neutral bar remains continuous through the panel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4250-8","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/5SL4250-8 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}}