63 A, 187 kA — what the ratings mean for your panel
The Siemens SENTRON 3VA2063-5JQ32-0KH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal budgeting. Its interrupting capacity hits 187 kA at 240 V and 121 kA at 415/440 V, meaning it can safely clear high-fault conditions on large transformer-fed distribution or heavy industrial feeders without cascading upstream. The ETU560 electronic trip unit provides adjustable long-time, short-time, instantaneous, and ground-fault protection; the ground-fault monitoring uses summation current formation on the L-conductor, so it catches leakage without a separate neutral CT.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA footprint that drops into the same cutout and bus-bar spacing as other 3VA frame-size breakers. Front IP40 protection means it is suitable for enclosed panel mounting where tools or fingers might contact the front face; no washdown rating, so keep it inside a sealed cabinet if the environment is wet. The auxiliary contact block is populated with 2 auxiliary switches plus 1 trip alarm switch (HQ version), giving direct status feedback to a PLC or annunciator without a separate interface relay.
Communication and monitoring
A communication function is built in — the ETU560 supports integration with higher-level energy management or control systems via the SENTRON communication platform, enabling remote trip indication, current metering, and parameter adjustment. The voltage trigger feature allows a remote signal to initiate a trip, useful for emergency-off or load-shedding schemes. Rated insulation voltage is 800 V, so it can be applied on 690 V systems (where its interrupting rating drops to 3 kA) without exceeding the dielectric withstand.