Part identity and what it does
That 20 A holds flat from 40 °C through 55 °C, then derates to 19 A at 60 °C and above — so in a warm panel you lose only 1 A, not a full bin rating.
Breaking capacity is the headline here: 75.6 kA at 240 VAC, 52.5 kA at 415 VAC, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. At 415 V the 52.5 kA still covers most industrial distribution panels. The drop to 7.5 kA at 500 V and 690 V is the limit of the TM210 release's arc extinction; if your system voltage sits above 480 V, verify the available fault current stays under that 7.5 kA or step up to a higher-frame 3VA1xxx.
The trip indicator gives a visible red flag when the breaker has tripped on fault — useful for a maintenance tech walking a line who needs to spot the open breaker without opening the panel door and metering every load.