It carries a rated current of 63 A at 40 °C and holds that rating through 50 °C before a slight derate begins — 62 A at 55 °C, 60 A at 65 °C, and 58 A at 70 °C, so in a warm enclosure you still have most of the headroom. Breaking capacity is the headline here: 220 kA at 240 V AC, 154 kA at 415 V, and 121 kA at 440 V.
Power loss at rated load is 17.3 W maximum — modest enough that ventilation in a typical enclosed panel is adequate, but worth checking if the breaker is packed tight with other heat sources.