Siemens 3VA2163-7MS36-0AG0 SENTRON MCCB, 63 A, 3-Pole, 330 k

The Siemens SENTRON 3VA2163-7MS36-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A continuously across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That flat thermal curve simplifies panel sizing: you don't have to oversize the frame for a warm enclosure. At 240 V it clears 330 kA; at 415 V and 440 V it clears 242 kA; at 500 V it clears 187 kA. At 690 V the figure drops to 3.7 kA — that's the limit for high-voltage low-fault installations. For most 400 V class distribution, 242 kA gives ample headroom above typical utility transformer fault levels. This MCCB is designed for starter protection, meaning its trip curve and internal construction are tuned for motor-starting inrush rather than straight feeder protection. The adjustable overload range spans 189 A to 945 A, so it covers motor FLA from roughly 190 A down to the 63 A continuous frame rating — a wide window for matching to the motor nameplate.