{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6263-7RC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6263-7RC","canonicalUrl":"https://aoctrl.com/siemens/5SJ6263-7RC","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6263-7RC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SJ6263-7RC, 2-pole, 63 A rated current, C tripping characteristic, 6 kA breaking capacity per EN 60898, 2 MW units wide.","salesMarkdown":"## What this MCB does for a panel Rated 63 A at 30 °C, the breaker occupies 2 modular width units (36 mm) on a DIN rail, with a 76 mm depth that leaves clearance for standard enclosure depths. The 2-pole design switches both phase and neutral in single-phase AC circuits up to 250 V, or two phases in multi-phase operation up to 440 V. The 5SJ6263-7RC carries a 10 000-cycle mechanical service life, typical for residential and light-commercial grade MCBs. Halogen-free and silicon-free construction means it meets low-smoke, zero-halogen material specs often required in ventilation-constrained or clean-room sub-distribution. ## Fit and compliance Installation depth is 70 mm into the enclosure — the 76 mm overall depth includes the toggle and terminal screws protruding past the rail foot. Sealable terminals (lead-sealable cover) allow the installer to lock the cover after commissioning, a detail often required by utility submetering or tenanted retail spaces. The 50/60 Hz supply frequency covers both 50 Hz European and 60 Hz North American grids, though the 6 kA breaking capacity is rated per EN 60898, not UL 489, so this is a CE-marked part for IEC markets. ## How the 63 A C-curve behaves in a real circuit At 63 A continuous, the thermal bimetal strip carries the full load without tripping. The magnetic trip fires between 315 A and 630 A (5–10× In), which clears hard faults but passes the 8–12× inrush of a 15 kVA transformer or a 7.5 kW motor starting direct-on-line. For circuits where the peak inrush exceeds 630 A — say, multiple large drives on the same feeder — step up to a D-curve or increase the breaker frame. In a panel with a 10 kA upstream transformer, this MCB needs a current-limiting upstream device (a 100 A gG fuse or a higher-rated MCCB) to keep the let-through energy within its rating. Coordination tables are in the Siemens SENTRON selectivity manual.","metaTitle":"Siemens 5SJ6263-7RC SENTRON MCB, 2P 63A C-Curve 6kA","metaDescription":"Siemens SENTRON 5SJ6263-7RC miniature circuit breaker, 2-pole, 63 A, C characteristic, 6 kA breaking capacity per EN 60898. Current lifecycle stage. Available to order against RFQ.","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":"5SJ6263-7RC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"MCB Retail line 2p 6kA 63A C Characteristic","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","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","Energy Limitation Class":"No","according to EN 61346-2":"F","at 30 °C / rated value":"63 A","according to IEC 81346-2":"F","Suitability For Operation":"retail line","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"6 kA","supply voltage / at AC / rated value":"415 V","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","with single-phase operation / at AC / rated value":"250 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/abbb4c6dfa1a74a88c340c3e0b4740f2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1423771&mlfb=5SJ6263-7RC"},"ai":{"faq":[{"question":"Where can I buy 5SJ6263-7RC and get a price?","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 commercial response."},{"question":"Will 5SJ6263-7RC fit a panel designed for 5SJ6325-7RC?","answer":"No — the 5SJ6325-7RC is 3-pole, 54 mm wide (3 MW). The 5SJ6263-7RC is 2-pole, 36 mm wide. The DIN-rail mounting is the same, but the busbar and wiring arrangement differ. A panel built for the 3-pole unit would need reconfiguring to accept the 2-pole breaker."},{"question":"What compliance documentation does Siemens provide for 5SJ6263-7RC?","answer":"As a SENTRON retail-line MCB, it carries CE marking per the Low Voltage Directive and is rated per EN 60898. The halogen-free and silicon-free construction supports RoHS and REACH compliance. Siemens provides a declaration of conformity and material declarations on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6263-7RC","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/5SJ6263-7RC 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}}