Short-circuit ratings that matter
At 500 V the rating drops to 42 kA, and at 690 V to 4 kA — still serviceable for most 690 V drives, but verify coordination if the available fault current at that voltage exceeds 4 kA. The breaker also carries a gL/gG fuse backup rating: 50 A at 400 V, 40 A at 500 V and 690 V. That tells you the maximum fuse size you can put upstream and still maintain selective coordination.
Motor sizing and horsepower coverage
This breaker covers a wide motor horsepower range: 0.5 hp at 110/120 V up to 10 hp at 575/600 V, with intermediate points at 200/208 V (2 hp), 220/230 V (3 hp), 400 V (1.5 hp), and 460/480 V (5 hp). That makes it a versatile pick for a panel that feeds different voltage taps.
Integration notes
That keeps heat dissipation adequate for the full rated current. Main circuit connections use ring cable lugs (M3 screw).