Siemens 5SY7463-6 is a SENTRON 4-pole miniature circuit breaker rated 63 A at 35 °C with B tripping characteristic. It breaks 15 kA per EN 60898 and 20 kA per IEC 60947-2, giving you headroom on SCCR coordination for a 400 VAC panel. The 72 mm width (4 modular units) snaps onto a DIN rail; any mounting position works, and the IP20 finger-safe terminals accept combined top/bottom feed.
Derating and ambient conditions
Rated current holds at 63 A up to 35 °C, then derates linearly: 59.98 A at 40 °C, 58.4 A at 45 °C, 56.83 A at 50 °C, 55.12 A at 55 °C, 53.42 A at 60 °C. Ambient humidity limits apply: max 95 % RH up to 55 °C, 55 % RH up to 70 °C, 35 % RH up to the 75 °C maximum. The -40 °C minimum means it can sit in an unheated enclosure through winter without issue.