It carries a breaking capacity of 121 kA at 240 V AC and 75.6 kA at 415 V AC — figures that tell you it handles high-fault-current scenarios typical of industrial distribution panels without cascading upstream. The TM210 thermal-magnetic release provides overcurrent and short-circuit protection; the trip indicator gives a clear visual signal after a fault event.
The 121 kA at 240 V and 75.6 kA at 415 V are the maximum short-circuit currents this MCCB can safely interrupt at those voltages. For a 480 V or 600 V class panel, the capacity drops to 52.5 kA at 440 V and 11.9 kA at 500 V and 690 V — still adequate for most secondary distribution, but verify your available fault current before committing the BOM line.
The 63 A rating holds from 40 °C through 50 °C; above that it derates linearly to 58 A at 70 °C. The 3VA frame measures 70 mm deep by 76.2 mm wide by 130 mm high — fits standard Siemens 3VA panel cutouts and bus-bar centers. Maximum power dissipation is 17.3 W, so ventilation in a sealed enclosure should be checked.