{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL3663-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL3663-6","canonicalUrl":"https://aoctrl.com/siemens/5SL3663-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL3663-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL miniature circuit breaker, 5SL3663-6, 4-pole (3P+N), 63 A, B-curve, 4.5 kA, 400 V AC.","salesMarkdown":"The Siemens 5SL3663-6 is a 4-pole (3P+N) miniature circuit breaker from the SENTRON 5SL series, rated 63 A at 400 V AC with a B-curve tripping characteristic. The neutral pole is switched (3P+N), which is required in some regional distribution boards to isolate the neutral on a fault. Terminal capacity accepts solid or stranded conductors from 0.75 to 25 mm², with a tightening torque of 2.5 to 3 N·m — enough for the 63 A feed cable. IP20 with conductors connected; no washdown rating, so it stays inside the enclosure. ## How it compares to nearby siblings — 5SL3625-7MB and 5SL3640-7MB The 5SL3663-6 is the 63 A, 4-pole, B-curve variant. The closest peer in the same form factor is the 5SL3640-7MB (40 A, 4-pole, B-curve) — same footprint, same breaking capacity, same terminal range. The 5SL3625-7MB is a 25 A, 4-pole, B-curve. If your panel was wired for a 25 A or 40 A 5SL3, the 5SL3663-6 drops into the same DIN slot and uses the same wiring (0.75–25 mm² terminals), but the higher current rating means the upstream protective device and cable must be rated for 63 A. No rewiring of the MCB itself is needed; just confirm the branch circuit can handle the increase. ## Integration notes — DIN rail, terminal torque, ambient limits Snap-on DIN rail mount, any orientation. The sealable feature allows a lockout tag to be fitted.","metaTitle":"Siemens 5SL3663-6 SENTRON MCB, 63 A, 4.5 kA, 4P, B-curve","metaDescription":"Siemens 5SL3663-6 SENTRON miniature circuit breaker, 63 A rated, 4.5 kA breaking capacity, 4-pole (3P+N), B-curve, 400 V AC. Current lifecycle status. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 25 mm²","Width":"72 mm","title":"5SL3663-6","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","description":"Miniature circuit breaker 400 V 4.5 kA, 3+N-pole, B, 63 A","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"4","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +45 °C","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":"B","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","Influence of the surrounding temperature":"Periodically +55°C, max. 95% humidity","with multi-phase operation / at AC / maximum":"440 V","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Product function / neutral conductor switching":"Yes","with multi-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cd1be46a3f11781d551e9b1ffb732815.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=393508&mlfb=5SL3663-6"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL3663-6?","answer":"It is rated 4.5 kA per both EN 60898 and IEC 60947-2, so it safely interrupts fault currents up to that level."},{"question":"Will the 5SL3663-6 drop into a panel wired for a 5SL3625-7MB?","answer":"Yes — same DIN-rail footprint (72 mm wide, 4 width units), same terminal range (0.75–25 mm² solid/stranded). No rewiring of the MCB itself is needed, but confirm the branch circuit is rated for 63 A."},{"question":"Where can I buy the 5SL3663-6 and what is the lead time?","answer":"Sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL3663-6","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/5SL3663-6 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}}