Short-circuit pickup Ii is fixed at 10 to 20 times In (160 to 320 A), which is typical for line protection — it clears hard faults fast but rides through motor inrush.
The breaker mounts in a standard IEC frame 160 footprint — three-pole, with a nut keeper kit included for secure terminal clamping on busbars or cable lugs. The 24 V DC undervoltage release coil draws power from the control circuit; verify that your 24 V supply can hold the coil energised (typically around 5 W holding) and that the UVR is wired to a normally-closed safety contact that drops the breaker on a trip condition. The TM240 dial is accessible on the front face for adjusting Ir without removing the cover.