That 63 A holds steady at every 5 °C increment, so the breaker delivers its full nameplate rating in a warm enclosure without a temperature correction factor. Breaking capacity is 330 kA at 240 VAC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. For a 480 V panel fed by a large transformer, the 242 kA at 440 V is the more relevant spec; the steep drop to 3.7 kA at 690 V means this is not a 690 V main breaker — it is sized for 240–500 V distribution.
Line protection design with shunt trip and auxiliary switches
The shunt trip lets a safety PLC or emergency-stop circuit open the breaker electrically; the auxiliary switches report open/closed position back to the control system.