It carries 20 A continuous at 40 °C ambient and holds that rating up to 55 °C before derating to 19 A at 60 °C and above — so in a hot cement plant control room or a crowded panel you still get full ampacity until the ambient pushes past 55 °C. Breaking capacity is 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500 V and 690 V. That 52.5 kA at 240 V gives you solid fault-clearing headroom on a 240 V distribution bus; the 7.5 kA at 690 V is the limiting figure if you're feeding a 690 V drive.
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — standard MCCB footprint for a 3-pole frame in this class. Mounts on a DIN rail or panel-mount base; the 76.2 mm width matches the typical 3-pole SENTRON 3VA slot, so it drops into an existing 3VA lineup without re-drilling the backplate.