Integrator note — 3VA2163-7MN32-0JA0
The Siemens 3VA2163-7MN32-0JA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) configured for motor protection, with a 63 A rated continuous current (Iu) and an ETU350M electronic overcurrent release. The 330 kA breaking capacity at 240 V means it can safely interrupt very high fault currents at the service entrance or large motor branch — this is not a general-purpose feeder breaker; it is sized for high-fault locations where standard MCCBs would weld shut. The motor protection designation and phase failure detection mean it tracks the thermal load of a motor start cycle, not just a resistive heater curve.
Breaking capacity and selectivity
The 3VA2163-7MN32-0JA0 carries a 330 kA breaking capacity at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. Those numbers are the ultimate short-circuit breaking capacity (Icu) — the maximum fault the breaker can clear once and still be functional afterward. For a 63 A frame, the 330 kA at 240 V is exceptionally high; it means this breaker can sit downstream of a large transformer or generator bus without needing a current-limiting fuse upstream. The 800 V rated insulation voltage (Ui) confirms the internal clearance and creepage are designed for 690 V systems, not just 480 V.
Thermal derating and panel integration
The 3VA2163-7MN32-0JA0 holds its full 63 A rating from 40 °C through 50 °C. At 55 °C it derates to 60.48 A, at 60 °C to 59.22 A, at 65 °C to 57.96 A, and at 70 °C to 56.7 A. The maximum power loss is 75 W — that is the heat the breaker dumps into the enclosure at full rated current, so a panel with multiple breakers side by side needs ventilation or a larger cabinet to stay below 55 °C. Dimensions are 181 mm high × 105 mm wide × 86 mm deep. The 105 mm width is a 3-pole frame; it occupies the same footprint as other SENTRON 3VA2 breakers, so a panel laid out for a 63 A 3VA2 will accept this unit without re-drilling the mounting plate.