{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL3663-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL3663-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL3663-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL3663-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL miniature circuit breaker, 5SL3663-7MB, 3P+N, C-curve, 63 A, 4.5 kA breaking capacity, 400 V AC.","salesMarkdown":"The 5SL3663-7MB is a Siemens SENTRON miniature circuit breaker rated 63 A with a C tripping characteristic, breaking 4.5 kA at 400 V AC per EN 60898 and IEC 60947-2. The 3P+N configuration (four-pole width, 72 mm) switches all three phases and the neutral — critical for TN or TT systems where neutral isolation is required during a fault. The 72 mm width (4 width units at 18 mm each) occupies four adjacent slots — plan for that footprint in your enclosure layout. Accepts conductors from 0.75 mm² up to 25 mm², which covers most branch-circuit wiring from 2.5 mm² lighting circuits up to 16 mm² subfeeds. ## Coordination and selectivity Rated 20,000 mechanical switching cycles typical — adequate for distribution duty where the breaker operates only under fault or maintenance isolation. The C-curve at 63 A coordinates well with downstream C-curve subcircuits up to about 20 A, provided the 4.5 kA fault level is not exceeded upstream. For higher prospective fault currents, a current-limiting upstream device (e.g., an NH fuse or an SENTRON 3VA molded-case breaker) is needed to keep the let-through energy within the 5SL3's 4.5 kA rating.","metaTitle":"Siemens 5SL3663-7MB SENTRON MCB, 63A C-Curve 4.5kA 3P+N","metaDescription":"Siemens 5SL3663-7MB SENTRON miniature circuit breaker, 63 A, C characteristic, 4.5 kA breaking capacity, 3P+N, 400 V AC. Active production. Available to order against RFQ.","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":"5SL3663-7MB","Height":"90 mm","Maximum":"25 mm²","Minimum":"0.75 mm²","Sealable":"Yes","Rated Value":"50 Hz","description":"Miniature circuit breaker 400 V 4.5 kA, 3+N-pole, C, 63 A","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","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"5SL miniature circuit breakers","Energy limiting class":"3","Number of width units":"4","Number of poles / Note":"3P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SL3","Suitability for operation":"Residential buildings/infrastructure","Current / at AC / rated value":"63 A","Tripping characteristic class":"C","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"4.5 kA","acc. to IEC 60947-2 / rated value":"4.5 kA","Product feature / Touch protection":"Yes","Supply voltage / at AC / rated value":"400 V","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 (switching cycles) / typical":"20 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/946b20d0c3a425edfffb6603b54b76fd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=205740&mlfb=5SL3663-7MB"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL3663-7MB?","answer":"The 5SL3663-7MB is rated 4.5 kA breaking capacity at 400 V AC, certified to both EN 60898 and IEC 60947-2. That covers most residential and light commercial service-entrance fault levels."},{"question":"Where can I buy 5SL3663-7MB?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm delivery commitment."},{"question":"What is the difference between 5SL3663-7MB and 5SL6606-7YA?","answer":"The 5SL6606-7YA is a 6 kA rated MCB in the same SENTRON 5SL6 series, offering higher breaking capacity. The 5SL3663-7MB is limited to 4.5 kA. Both are 63 A, C-curve, 3P+N, and share the same 72 mm footprint, so the 5SL6606-7YA can drop in as a direct replacement where the higher SCCR is needed, provided the upstream coordination is verified."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL3663-7MB","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/5SL3663-7MB 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}}