Rated insulation voltage is 800 V, and the breaker holds its 63 A rating from 40 °C up through 50 °C without derating; at 55 °C it steps down to 60.6 A and continues a linear derating curve to 53.6 A at 70 °C.
Breaking capacity across voltage levels
This breaker's interrupting performance drops as system voltage rises: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V.
The shunt trip (STL) is built in, not a field-add-on — part number 3VA9688-0BL33 for the integrated auxiliary trip. It's a straight line-protection MCCB with remote trip capability and basic alarm contacts.
