What the interrupting ratings mean for your fault-current study
The Siemens 3VA2063-6HN32-0JL0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for line protection in a 3-pole configuration. Its continuous current rating sits at 63 A, and it holds that rating flat across the full ambient temperature range from 40 °C up to 70 °C — no derating curve to chase in a warm panel. The interrupting capacity is the headline number that decides whether this breaker clears a fault without welding its contacts or venting arc gas. At 240 V it interrupts 242 kA; at 415 V and 440 V it holds at 187 kA; at 500 V it drops to 121 kA; at 690 V it is rated 3 kA. That steep roll-off above 500 V means this is a 480 V class MCCB — do not spec it for a 600 V feeder expecting the same fault-clearing muscle.
Auxiliary switch and shunt trip — what is wired in
This variant ships with a factory-installed auxiliary switch block: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ designation). It also carries a shunt trip (STL) release. That means you get remote trip capability and status feedback without opening the breaker cover to add accessories — useful for a panel where the MCCB is part of an E-stop chain or monitored by a PLC. Power loss is listed at 5.4 W maximum. That is low enough that thermal rise inside a crowded enclosure is manageable, but if you are stacking several of these on a bus, add it to your enclosure heat budget.
Footprint and panel fit
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. It mounts on a DIN rail or directly to a backplate.