63 A MCCB with high-interrupt capacity for line protection
Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V — numbers that tell you this breaker handles serious fault current without upstream cascading. The thermal derating curve is flat from 40 °C through 50 °C at the full 63 A, then drops to 60.48 A at 55 °C and 56.7 A at 70 °C. The integrated auxiliary trip uses the 3VA9608-0BB11 accessory. No communication function, no phase failure detection — this is a straightforward thermal-magnetic line protection device, not a smart breaker.
The 3VA1163-5EF36-0BA0 measures 70 mm deep, 76.2 mm wide, and 130 mm tall. Depth of 70 mm leaves room behind a 200 mm deep enclosure for wiring and the UVR coil.