The headline number is the interrupting capacity: 220 kA at 240 V, dropping to 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. The thermal derating curve is flat from 40 °C to 55 °C at 20 A, then steps down to 19 A at 60 °C through 70 °C — so in a warm panel you lose only 1 A. Power loss peaks at 12 W. The adjustable instantaneous pickup (li) maxes out at 320 A — that's 16x the continuous rating, giving you headroom for motor inrush or transformer magnetizing current without nuisance tripping. The TM240 release is a fixed thermal-magnetic type; no electronic adjustment for long-time or short-time delays. Optional motor drive is available for remote operation.
The 3-pole footprint is standard for this class — the 76.2 mm width is three modular units (each 25.4 mm). Verify gland-plate clearance for the 70 mm depth, especially if you're adding the optional motor drive.