The 3-pole configuration with a 100 A frame covers most small-to-medium motor starters up to roughly 37 kW on 400 V systems, depending on the motor's full-load amps and starting method.
The interrupting ratings here are the key to coordination. At 415 V and 440 V it's rated 242 kA; at 500 V it drops to 187 kA; at 690 V it's 3.7 kA. For a panel fed by a transformer with a high short-circuit capacity — say 200 kA at 400 V — this breaker gives you headroom for selective coordination downstream, meaning a fault on a branch trips the branch breaker, not this main, keeping the rest of the line running.