The Siemens 5SL4263-6 is a SENTRON miniature circuit breaker (MCB) in a 2-pole, B-curve configuration rated at 63 A continuous at 30 °C, with a 10 kA breaking capacity per EN 60898 and IEC 60947-2. At 40 °C ambient the continuous rating derates to 59.67 A; at 55 °C it drops to 54.29 A — factor that into the load schedule if the panel runs hot.
Same part, different passport — if you are sourcing cross-border, the 5SL4263-6 carries the same genuine Siemens build regardless of which authorized region it ships from. The manufacturer warranty geofencing is real; let me be transparent — if warranty territory matters to your compliance team, flag it on the RFQ and we will route from the matching region.