{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4550-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4550-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4550-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4550-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL miniature circuit breaker, 5SL4550-8, D tripping characteristic, 50 A rated at 30 °C, 2-pole (1P+N), 10 kA breaking capacity per EN 60898 and IEC 60947-2, 230 V AC, 2 modular width units.","salesMarkdown":"The Siemens 5SL4550-8 is a SENTRON miniature circuit breaker (MCB) with a D tripping characteristic, rated 50 A at 30 °C and 230 V AC. It is a 2-pole unit (1P+N) that occupies 2 modular width units on a DIN rail, making it a direct drop-in for standard residential and infrastructure panels. The D curve means it tolerates high inrush currents — typical for motor, transformer, or lighting ballast loads — without nuisance tripping, while still providing short-circuit protection at 10 kA per EN 60898 and IEC 60947-2. ## Ratings that matter for the BOM line At 40 °C it derates to 46.19 A, at 45 °C to 44 A, and at 55 °C to 39.81 A — so if your panel runs warm, size the load accordingly. The 10 kA breaking capacity at 230 V AC covers most residential and light commercial fault levels; the same 10 kA applies under IEC 60947-2 for industrial installations. The part switches the neutral conductor (1P+N) and includes touch protection on the terminals. Depth is 76 mm (installation depth 70 mm), width 36 mm (2 MW), height 90 mm. Sealable, halogen-free, silicon-free.","metaTitle":"Siemens 5SL4550-8 SENTRON MCB, D Curve, 50 A, 2-Pole","metaDescription":"Siemens 5SL4550-8 SENTRON miniature circuit breaker, 50 A, D tripping characteristic, 2-pole (1P+N), 10 kA breaking capacity per EN 60898. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-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","Design Of The Product":"5SL miniature circuit breakers","Number Of Poles / Note":"1P+N","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":"230 V","Influence Of The Surrounding Temperature":"+55 °C, max. 95% humidity","Product Function / Neutral Conductor Switching":"Yes","with single-phase operation / at AC / rated value":"250 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/33e571ac4223ddce0bdc88ccae49eeb4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=486743&mlfb=5SL4550-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4550-8/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SL4550-8?","answer":"Submit an RFQ through this listing. The part is sourced to order through independent distribution; pricing and stock levels are confirmed at quote time."},{"question":"What is the breaking capacity of 5SL4550-8?","answer":"10 kA per EN 60898 and 10 kA per IEC 60947-2 at 230 V AC."},{"question":"What does the D tripping characteristic mean for this MCB?","answer":"The D curve trips magnetically at 10 to 20 times the rated current (500–1000 A for this 50 A unit), which suits loads with high inrush like motors, transformers, or discharge lighting. It avoids nuisance trips that a B or C curve would cause on those loads."},{"question":"Will 5SL4550-8 drop into a panel specified around 5SL6550-7BB?","answer":"Both are 2-module-width SENTRON MCBs on the same DIN-rail footprint, so mechanical fit is the same. The key difference is the tripping characteristic: 5SL4550-8 is a D curve; 5SL6550-7BB is a different characteristic. Verify the curve matches your load before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4550-8","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/5SL4550-8 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}}