Rated current holds at 20 A from 40 °C up to 55 °C, then derates to 19 A at 60–70 °C — so in a warm enclosure you still get full rating up to 55 °C ambient. Breaking capacity is 52.5 kA at 240 V AC, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500 V and 690 V — that covers most industrial distribution panels up to 690 V line-to-line. Insulation voltage is rated at 800 V.
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — that's a compact 3-pole MCCB footprint, fits standard Siemens 3VA panel cutouts and busbar systems. Maximum power loss is 14.5 W — account for that in the enclosure thermal budget if you're packing several breakers side by side.