63 A MCCB with 242 kA interrupting capacity — what that means for your panel
The Siemens SENTRON 3VA2163-6HN32-0HC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with a 242 kA breaking capacity at 240 V — that's the short-circuit current it can safely interrupt without welding contacts or rupturing the case. At 415 V and 440 V it still holds 187 kA, dropping to 121 kA at 500 V and 5 kA at 690 V. For a line protection breaker, that SCCR headroom means it can sit upstream of smaller branch breakers and still clear a bolted fault without cascading failure.
ETU350 release and shunt trip — what's built in
The auxiliary release is a shunt trip (STL), so you can remotely trip the breaker via a control signal.
Rated 63 A up to 50 °C ambient; above that it derates linearly to 53.55 A at 70 °C. Maximum power loss is 4 W — negligible for enclosure heat load. If you're replacing an older 3VA1 frame, check the depth — this 3VA2 series is deeper than the 3VA1's 60 mm footprint.