The continuous current rating holds at 20 A from 40 °C through 55 °C, then derates to 19 A at 60 °C and above, so in a warm panel you lose 1 A once ambient hits 60 °C. Breaking capacity is 52.5 kA at 240 V AC and 7.5 kA at 415 V AC — that 52.5 kA figure is the one that matters for high-fault service entrances or large transformer secondaries; the 415 V number is lower but still covers most industrial distribution panels.
At 25.4 mm wide (1 inch), 130 mm tall, and 70 mm deep, this breaker fits a standard 1-pole MCCB slot in a SENTRON distribution panel or a separate enclosure. No communication function, no motor drive option, and no neutral conductor upgrade path, so it's a basic thermal-magnetic breaker with no add-on accessories for remote trip or status monitoring.