It carries a TM240 thermal-magnetic trip unit — the thermal element handles overloads, the magnetic element clears short circuits — and breaks up to 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V.
Rated 20 A from 40 °C through 55 °C, then derates to 19 A at 60 °C through 70 °C. That's a shallow derate curve — you lose only 1 A over a 30 °C rise — so in a warm panel next to a drive or transformer the breaker holds its rating. The 12 W maximum power loss matters for panel thermal budgeting if you're stacking several breakers in a closed cabinet.
What fits and what doesn't
Mounts in the standard SENTRON 3VA panel cutout — 76.2 mm wide per pole, 130 mm tall. If your panel was laid out for a 3VA1110 frame, check the depth — this one is 70 mm, which matches the 3VA1110 depth, so it should drop in without rewiring as long as the bus bars and lug kit align.