MCCB for line protection — 63 A, 3-pole, high interrupting capacity
Its interrupting capacity reaches 220 kA at 240 V AC, 154 kA at 415 V, and 121 kA at 440 V — figures that cover most industrial service-entrance and distribution panel fault levels without needing a current-limiting upstream device.
The breaker holds 63 A from 40 °C through 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 — useful when the MCCB sits in a crowded enclosure with limited airflow. Dimensions are 130 mm height, 76.2 mm width (3 in), and 70 mm depth (2.76 in), which fits standard Siemens 3VA panel cutouts and bus-bar spacing. Maximum power loss is 17.3 W — account for that heat in the enclosure thermal calculation.