What this MCCB carries — and what that means for your panel
The Siemens SENTRON 3VA2063-5JQ32-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a full-scale current of 63 A across the entire operating temperature range from 40 °C to 70 °C — no derating needed as the panel warms up. Breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V means it clears a massive fault without upstream coordination headaches — useful for high-fault service-entrance or sub-distribution panels where the available short-circuit current is stiff. The adjustable thermal-magnetic trip range spans 95 A minimum to 756 A maximum, so this breaker can be tuned to protect a feeder or a large motor branch — not a fixed 63 A only. The basic switch inside is order code 3VA20635JQ320AA0, and it ships with 2 auxiliary switches (HP type) for status feedback to a PLC or annunciator.
Integration — footprint and wiring
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard MCCB footprint for a 63 A frame. Mounts on a DIN rail or direct panel; the 86 mm depth keeps it inside shallow enclosures. Communication function is built in, so it can talk to a higher-level system without an add-on module. Power loss is 5.4 W maximum — low enough that ventilation in a typical IP54 steel enclosure is not required, but worth checking if you pack six of these side-by-side.