The Siemens SENTRON 3VA2163-5MN36-0BL0 is a 3-pole molded case circuit breaker (MCCB) rated for a flat 63 A across the full operating temperature range from 40 °C to 70 °C — no derating curve to chase. That makes it a straight drop-in for motor branch circuits where the load current sits at 63 A and the ambient inside the panel runs warm. Its interrupting ratings climb to 187 kA at 240 V and hold at 121 kA through 415–440 V, then step down to 75.6 kA at 500 V and 3.7 kA at 690 V. This variant is explicitly designed for motor protection, with phase failure detection built in and an undervoltage release (UVR) factory-fitted.
Maximum power loss is 6.5 W, which keeps internal cabinet heating manageable even in a densely packed sub-panel.