Its 187 kA breaking capacity at 240 V handles high-fault utility feeds; at 415 V it still interrupts 121 kA, and at 690 V the rating drops to 3.7 kA, which tells you this breaker is sized for low-voltage distribution, not 690 V motor circuits. That switch complement means you get status feedback for position, tripped, and alarm conditions without adding external relays.
At 415/440 V it still holds 121 kA, and at 500 V it's 75.6 kA. Those are high-interrupting ratings — typical for a main breaker in a large distribution board fed by a transformer of several hundred kVA. The sharp drop to 3.7 kA at 690 V confirms this is a 480 V class breaker, not a 690 V device.