The 3VA1150-4EF36-0DH0: This MCCB delivers 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. Those numbers cover the full range of common industrial distribution voltages — 240 V single-phase, 415/440 V three-phase, and 690 V for heavy plant.
Thermal derating — what the 50 A rating actually means
The 50 A rating holds from 40 °C through 50 °C, then begins to taper: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Plan your load margin accordingly; the breaker will not trip early, but it will run warmer.
Overcurrent release and auxiliary contacts
That is a standard choice for general-purpose feeder protection.