It's fitted with an ETU550 electronic trip unit — that's the brains that gives you adjustable long-time (tr) and short-time (tsd) delay settings, so you can dial in selectivity with downstream breakers instead of guessing. The 800 A rating holds flat from 40 °C up to 60 °C before it starts to derate; at 65 °C you get 767 A, and at 70 °C it's 703 A.
This MCCB interrupts 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V.
The case dimensions are 320 mm high, 210 mm wide, 120 mm deep. Communication function is onboard, so it can talk to a higher-level system for metering and status — useful for a plant-floor power-monitoring scheme.
Power loss maxes out at 135 W — that's heat that has to leave the enclosure; don't bury this in a sealed box without ventilation. The ETU550 trip unit lets you set Ir from 0.5 to 1.0 x In (400 to 800 A), tr from 0.5 to 25 seconds, and tsd from 0.05 to 0.5 seconds — plenty of adjustment for coordinating with downstream feeders.