What this 3VA2063-5HN36-0KA0 brings to a panel
Breaking capacity hits 187 kA at 240 V AC and holds 121 kA at 415/440 V, then drops to 79 kA at 500 V and 3.4 kA at 690 V. The ETU350 release gives you adjustable long-time, short-time, and instantaneous pickup, plus ground-fault capability if you add the optional module.
Rated 63 A from 40 °C through 50 °C; above that it derates linearly to 53.55 A at 70 °C. The 5.4 W max power loss is modest; no special ventilation required in a typical IP54 enclosure.