It's a 3-pole, 800 A frame, manually operated distribution breaker with a MicroLogic 5.0 A electronic trip unit.
The MicroLogic 5.0 A trip unit provides LSIG protection: L (long-time overload), S (short-time short-circuit), I (instantaneous short-circuit), and G (earth-leakage — though this specific unit ships without earth-leakage protection). The electronic trip gives you adjustable curves, so you can coordinate downstream breakers. The 150 kA Icu at 415 V AC is the maximum short-circuit current the breaker can clear and still be usable afterward; at 500/525 V AC that drops to 100 kA Icu. The 20 W power loss is heat you need to vent in a closed panel — at 800 A continuous, that's real thermal load. The IP40 front face keeps tools and fingers out but isn't washdown-rated; this lives in a dry indoor switchboard.
Fixed mount on a backplate. Front connections both upside and downside. The 210 mm width and 327 mm height mean it fills a standard MCCB slot in a switchboard — check your cubicle cutout against those dimensions. The 147 mm depth is the body depth; add clearance for the front connections and the LCD display.