The Siemens 3VA2163-5JP32-0DH0 is a SENTRON molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Breaking capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V.
Sizing and fit for a panel
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — that 86 mm depth is tight enough for shallow enclosures, so check your gland-plate clearance before committing. The 63 A continuous rating holds steady from 40 °C to 70 °C, meaning you don't have to oversize for a hot cabinet. Power loss is 6.5 W maximum — negligible for thermal budgeting, but worth noting if you're packing a dozen breakers in a sealed box.