MCCB with headroom for high-fault panels
The Siemens 3VA1163-5EF32-0AH0 is a SENTRON 3-pole molded case circuit breaker rated for 63 A continuous at 40 °C through 50 °C, with a TM240 thermal-magnetic trip. Its breaking capacity hits 187 kA at 240 V and 121 kA at 415 V, so it handles high available fault current at the service entrance or a large motor control center without cascading upstream. The TM240 release means the thermal element is fixed at 63 A — no field adjustment on the continuous current. That suits a dedicated feeder or a fixed-load branch where you don't need a variable trip setting. The magnetic pickup is factory-set for the high interrupting rating.
Thermal derating and panel fit
At 55 °C the breaker carries 60.48 A, at 60 °C it's 59.22 A, and it drops to 56.7 A by 70 °C. If the panel ambient runs hot — say next to a drive cabinet or a transformer — size the load or the enclosure ventilation to stay within the derated curve. The case dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. That's a compact footprint for a 63 A MCCB with this interrupting rating. It mounts on a DIN rail or panel plate; the IP40 front means it's fine in a typical enclosed panel but not for washdown zones. It ships with 2 auxiliary switches plus a separate trip alarm switch (HQ version), so you get status feedback on open/closed and a dedicated signal when the breaker trips on fault. No undervoltage release, no shunt trip, no ground-fault module on this variant.
Lifecycle and sourcing
Rated insulation voltage is 800 V and the breaker is listed for use in DC networks per the 3VA device manual. It carries a mechanical endurance of 15,000 operations, which is typical for a distribution-grade MCCB — not a switching-duty contactor, but fine for infrequent manual or remote operation.