Breaking capacity runs 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3 kA at 690 V. The 3 kA at 690 V tells you this isn't the breaker for a 690 V motor feeder — that's a different frame size.
The 86 mm depth means it clears most shallow enclosures, but check the door clearance if you're adding rotary handles or auxiliary contacts.
What the ETU350 trip unit means for coordination
The ETU350 is an electronic trip unit with LSI protection — long-time (overload), short-time (short-circuit with delay), and instantaneous. That short-time delay is the key feature for selective coordination: you can set a delay so a downstream fault clears first, and this breaker only trips if the fault persists. Fixed thermal-magnetic breakers can't do that.