Breaking capacity is the headline spec for an MCCB: this unit interrupts 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. Those numbers tell you it handles high fault currents at common low-voltage distribution levels — the 187 kA at 240 V covers most North American panelboard fault ratings, while the 121 kA at 415 V suits European 400 V systems. At 690 V the capacity drops sharply, so it is not the right choice for 690 V drives or mining gear unless the available fault current is known to be under 3.7 kA.
Verify the panel depth — 86 mm plus wiring space and any auxiliary modules needs clearance behind the door.