MCCB for line protection — 100 A frame, high interrupting capacity
It carries a continuous current rating of 100 A at 40 °C, derating to 91 A at 70 °C, and delivers a breaking capacity of 121 kA at 240 V AC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream.
The interrupting rating varies with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a 480 V panel (common in North America), the 52.5 kA at 440 V is the closest published figure — expect a similar or slightly lower value at 480 V, so verify coordination with the upstream fault current.