The 5SL5463-7RC: The 63 A rating at 30 °C is the headline number, but the real-world current-carrying capacity drops as ambient temperature rises — 59.2 A at 40 °C, 57.3 A at 45 °C, 56.1 A at 50 °C, 53.6 A at 55 °C, and 51 A at 60 °C. If your panel runs warm, size the load to the derated figure, not the 30 °C value. DC rating to 880 V means it handles series-connected solar strings or battery banks where a standard AC-only MCB would arc rather than clear.
Snap-on DIN rail mount, any position. IP20 with connected conductors means the busbar and wiring must be in place for the finger-safe rating; exposed terminals are touch-hazard.