{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL3640-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL3640-7","canonicalUrl":"https://aoctrl.com/siemens/5SL3640-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL3640-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 3P+N, C-curve, 40 A, 400 V AC, 4.5 kA (EN 60898), 5 kA (IEC 60947-2), 4 MW units, depth 76 mm.","salesMarkdown":"It's built for residential and infrastructure branch-circuit protection — think lighting panels, socket circuits, and small distribution boards where the C-curve handles moderate inrush from motors or transformers without nuisance tripping. Rated breaking capacity is 4.5 kA per EN 60898 and 5 kA per IEC 60947-2, so it's suited for domestic and light commercial service where fault levels stay under those thresholds. The 3P+N design switches all three phases plus a switched neutral — common in three-phase final subcircuits where you need to isolate the neutral for safe maintenance. At 40 A rated current (at 30 °C ambient), this MCB carries a full 40 A continuously. But if the panel runs hot — say 40 °C inside the enclosure — the rating derates to 38.07 A; at 45 °C it's 36.8 A, and at 55 °C it drops to 34.97 A. That derating curve is the number to check when you're stuffing four of these into a crowded enclosure: the thermal rise between breakers matters more than the nameplate 40 A. The C-curve means the magnetic trip kicks in at 5 to 10 times the rated current — so for a 40 A breaker, instantaneous trip happens between 200 A and 400 A. That's a good fit for motor starters and small compressors that draw a startup surge, but not for high-inrush transformer loads (use a D-curve there). Power loss per pole is 3.3 W at rated current in hot operating state, so a 4-pole unit dissipates about 13.2 W total. In a sealed IP20 distribution board with multiple breakers, that heat adds up — plan ventilation or spacing if you're packing the rail. ## Mechanical fit and integration It occupies 4 modular width units (each 18 mm wide, so 72 mm total). Mounting position is any — upright, sideways, or upside-down — so it fits tight compartments without derating.","metaTitle":"Siemens 5SL3640-7 SENTRON MCB, 3P+N, C-Curve, 40 A, 4.5 kA","metaDescription":"Siemens SENTRON 5SL3640-7 miniature circuit breaker, 3P+N, C-curve, 40 A, 400 V AC, 4.5 kA (EN 60898). Current lifecycle. Depth 76 mm. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SL3640-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 4.5 kA, 3+N-pole, C, 40 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P+N","Number Of Poles":"4","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"40 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","at 30 °C rated value":"40 A","at 40 °C rated value":"38.07 A","at 45 °C rated value":"36.8 A","at 55 °C rated value":"34.97 A","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"4.5 kA","according to IEC 60947-2 rated value":"5 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 (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bf76aa9523afc8fdc5e7b33fb9790791.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=437132&mlfb=5SL3640-7"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL3640-7","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/5SL3640-7 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}}