Ratings and thermal performance
The 63 A rating holds flat from 40 °C to 50 °C (–), then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C (–). That derating curve is tight — only 5 A lost by 70 °C — so the breaker keeps its full rating in most panel ambient conditions. Maximum power loss is 17.3 W, which matters for heat buildup in a densely packed enclosure.
Breaking capacity drops with system voltage: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. The steep fall above 440 V is typical for MCCBs; at 480/500 V the 17 kA still covers most industrial service-entrance and feeder applications.
The shunt trip allows remote opening via a control voltage — useful for emergency-stop or interlock circuits. No undervoltage release is fitted.