{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL1263-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL1263-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL1263-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL1263-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL1263-7MB, 2-pole miniature circuit breaker, C-curve, 63 A rated current, 3 kA breaking capacity (IEC 60947-2), 230/400 V AC, 36 mm wide.","salesMarkdown":"The Siemens 5SL1263-7MB is a SENTRON 5SL series miniature circuit breaker, 2-pole, C-curve, rated 63 A at 30 °C. Breaking capacity is 3 kA per IEC 60947-2 — that's the fault current it can safely interrupt without welding contacts or cascading upstream. The C-curve (5-10x In) means it handles moderate inrush from motor starters or transformer loads without nuisance tripping, while still clearing short circuits fast enough for most residential and light-commercial panels. ## Panel fit and mounting Width is 36 mm (2 modular units), depth 76 mm, installation depth 70 mm. Snaps onto standard DIN rail — any mounting position works, no derating for orientation. IP20 with conductors connected, so it's panel-internal only; no washdown exposure. Halogen-free and silicon-free construction matters if this goes into a clean room or a zone where off-gassing from a fault could damage nearby electronics. ## What the ratings mean for your panel The 3 kA breaking capacity (IEC 60947-2) is the ceiling for fault clearing — if your available fault current at the panel exceeds that, you need an upstream current-limiting device or a higher-rated breaker. Overvoltage category III and pollution degree 2 are standard for fixed-installation distribution boards. Mechanical service life is 4,000 switching cycles — fine for branch-circuit protection where it trips rarely, but not for frequent switching duty. The sealable design lets a panel builder or inspector lock the toggle position after commissioning.","metaTitle":"Siemens 5SL1263-7MB SENTRON MCB, 2P C-Curve 63A 3kA","metaDescription":"Siemens 5SL1263-7MB SENTRON miniature circuit breaker, 2-pole, C-curve, 63 A, 3 kA breaking capacity per IEC 60947-2. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SL1263-7MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V 3kA, 2pole, C, 63A","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","at AC / rated value":"63 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Design Of The Product":"5SL miniature circuit breakers","Number Of Poles / Note":"2P","at 30 °C / rated value":"63 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","acc. to IEC 60947-2 / rated value":"3 kA","Product Feature / Touch Protection":"No","supply voltage / at AC / rated value":"230 V","with multi-phase operation / at AC / maximum":"440 V","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"253 V","Mechanical Service Life (Switching Cycles) / Typical":"4 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ddb2100956be4f51d99cbda4263b5fb9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1046736&mlfb=5SL1263-7MB"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL1263-7MB?","answer":"3 kA per IEC 60947-2. That's the maximum fault current it can safely interrupt at 230/400 V AC."},{"question":"Will 5SL1263-7MB drop into a panel specified for 5SL3205-7MB?","answer":"Yes — same 36 mm width, same 76 mm depth, same DIN-rail mounting. The 5SL3205-7MB is a 0.5 A C-curve; this is 63 A C-curve. Same footprint, different current rating. No rewiring needed if the busbar and load conductors are sized for 63 A."},{"question":"How do I get current pricing and availability for 5SL1263-7MB?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time — submit an RFQ for a firm quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL1263-7MB","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/5SL1263-7MB 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}}