Three poles, with an interrupting capacity that starts at 330 kA at 240 V and drops to 3.7 kA at 690 V. The 3.7 kA at 690 V is the real-world ceiling for a 63 A frame on a 690 V line. The UVR means the breaker trips if control voltage drops — common in E-stop strings or safety circuits where you want the motor dropped on loss of control power.
Power loss is 6.5 W maximum at rated current. That's low enough that you don't need forced ventilation in a typical IP54 steel enclosure, but if you're stacking several of these side by side, keep the 6.5 W per unit in your thermal budget.