It is a 3-pole unit rated 50 A at 40 °C, with a rated insulation voltage of 800 V, and it carries an undervoltage release (UVR) plus a 2-auxiliary-switch + 1-trip-alarm-switch block built in.
This MCCB delivers 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V. For a 480 V panel in North America, the 32 kA at 440 V figure governs (480 V is the line-to-line nominal; the actual fault test voltage is typically 480/277 V, but the closest published rating is 440 V).
Thermal derating — don't size at the 40 °C number alone
Above that it derates: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If this MCCB lives in a non-air-conditioned enclosure near a transformer or drive, the 45–48 A range is the real continuous limit. The maximum power loss is 17.1 W — that's the heat the breaker dumps into the enclosure, which matters for thermal rise calculations in a sealed panel.