Breaking capacity reaches 242 kA at 240 V, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 40 kA at 690 V — this tells you the available fault current the breaker can safely interrupt at each system voltage without upstream cascading.
The continuous current rating is temperature-dependent: 630 A at 40 °C, 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C.
The 138 mm width is the 3-pole frame size — verify cutout and busbar spacing against the existing panel layout before ordering.