Breaking capacity is the headline number for this class: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. This is a straightforward line-protection MCCB, not a multifunction power breaker.
The 3VA1 family uses a common footprint across current ratings, so swapping a 100 A unit for this 125 A unit does not require re-drilling the backplate.
Thermal performance across the panel ambient range
At 55 °C it drops to 122 A, at 60 °C to 120 A, at 65 °C to 117 A, and at 70 °C to 114 A. The derating curve is gentle — about 0.2 A per °C above 50 °C — so a panel running at 60 °C ambient still gets 96% of the nameplate rating.