It limits current rise and harmonics on the AC side of a variable-frequency drive or DC drive converter, protecting the semiconductor bridge from commutation notches and reducing line-side distortion. Rated for 400 V AC at 50 Hz, it carries a maximum continuous AC current of 125 A and a rated operational current of 112.5 A under those conditions.
The 125 A AC maximum (Ith) is the thermal current rating — the choke can carry that continuously in free air at 40 °C ambient. The 112.5 A AC rated operational current is the value to use for sizing against a specific drive's input current; if your drive draws 110 A continuous, this choke is a match. The DC rated current of 153.1 A tells you the choke can also sit on the DC bus of a converter, though the AC-side application is more common. Peak current capability of 156 A gives headroom for short-duration overloads during motor starting or load transients.