What this MCCB is and what it protects
The Siemens 3VA1163-3EF32-0JC0 is a SENTRON molded case circuit breaker (MCCB) configured for line protection — meaning it guards feeders and distribution circuits against overload and short-circuit, not motor or generator protection. Rated continuous current Iu is 63 A, and the TM240 thermal-magnetic overcurrent release handles the overload curve and instantaneous trip. Breaking capacity varies by system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. This is a 3-pole breaker with no undervoltage release, no ground-fault monitoring, and no communication module — it's a straightforward thermal-magnetic MCCB for basic overcurrent protection. It does carry a shunt trip (STL) auxiliary release and two auxiliary switches (HQ) for remote status indication or trip-signal wiring.
Thermal derating and panel fit
Rated 63 A continuous at 40 °C through 50 °C — no derating needed in that band. At 55 °C it drops 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. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. Physical footprint: 130 mm height, 76.2 mm width, 70 mm depth. The front face carries IP40 protection — adequate for inside an enclosed panel; not rated for washdown or outdoor exposure. No trip indicator on the front, so fault indication relies on the auxiliary switches wired back to a PLC or annunciator.