{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4603-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4603-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4603-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4603-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4603-8, 4-pole 3P+N miniature circuit breaker, D tripping curve, 3 A rated at 400 V AC, 10 kA breaking capacity, 4 MW units wide.","salesMarkdown":"The Siemens 5SL4603-8 is a 4-pole (3P+N) SENTRON miniature circuit breaker with a D tripping characteristic, rated 3 A at 400 V AC and a 10 kA breaking capacity per EN 60898 and IEC 60947-2. That D-curve means it tolerates the high inrush of motor and transformer loads without nuisance tripping — the magnetic trip kicks in at 10–20× rated current, so it's the right choice for inductive circuits, not general lighting or resistive heaters. The 10 kA SCCR at 400 V tells you it can safely interrupt a fault up to that level without cascading upstream — coordination matters when you're protecting a distribution board feeding multiple motor starters. ## Fit and integration Snaps onto DIN rail; occupies 4 modular width units (72 mm wide). Depth is 76 mm, installation depth 70 mm — leaves clearance for wiring gutters in a standard 200 mm deep enclosure. Neutral conductor is switched (3P+N), so you get full isolation on all poles. Mounting position any, which helps when the panel layout is tight and you're rotating breakers to match busbar orientation. IP20 with connected conductors — fine inside a closed panel, not for wet environments. ## Thermal derating and environment Rated 3 A at 30 °C ambient; derates to 2.88 A at 40 °C and 2.69 A at 55 °C. If your panel runs hot — say a crowded MCC with drives below — the effective ampacity drops. The breaker is halogen-free and silicon-free, which matters for outgassing-sensitive environments like clean rooms or sealed enclosures near sensitive electronics. Temperature range -40 to 75 °C covers outdoor enclosures in cold climates. Sealable with a lockout provision for lockout/tagout compliance.","metaTitle":"Siemens 5SL4603-8 SENTRON MCB, 4P D-Curve 3A 10kA","metaDescription":"Siemens 5SL4603-8 SENTRON miniature circuit breaker, 4-pole 3P+N, D tripping curve, 3 A rated, 10 kA breaking capacity per EN 60898. Active production, sourced to order. Quoted on","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SL4603-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3+N-pole, D, 3A","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","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":"3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Number Of Poles / Note":"3P+N","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"3 A","at 40 °C / rated value":"2.88 A","at 45 °C / rated value":"2.82 A","at 55 °C / rated value":"2.69 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"4","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":"Yes","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fe0607c969e3cb56ae4acad7134d99c5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=431892&mlfb=5SL4603-8"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL4603-8?","answer":"10 kA per both EN 60898 and IEC 60947-2 at 400 V AC. That's the maximum fault current it can safely interrupt."},{"question":"What does the D tripping curve mean for this breaker?","answer":"D-curve means the magnetic trip operates at 10–20 times rated current (30–60 A for this 3 A unit). It's sized for motor and transformer inrush, not for resistive loads where a B or C curve would be a better fit."},{"question":"Where can I buy the 5SL4603-8 and how is it quoted?","answer":"Sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time, no stock figures on the public page."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4603-8","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/5SL4603-8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}