What the ratings mean for fit
The Siemens SENTRON 3VA1063-3ED32-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, with a breaking capacity of 75.6 kA at 240 V AC. That 75.6 kA interrupting rating means it can safely clear a fault current up to that level without the arc escaping or the case rupturing — critical for high-fault-capacity service entrances or distribution panels where the available fault current is known to be high. The 63 A continuous rating holds across 40 °C to 50 °C ambient, then derates to 58 A at 70 °C, so it's sized for a 63 A feeder or large motor circuit in a ventilated enclosure. Rated insulation voltage is 800 V, which covers 480 V and 600 V class systems with headroom. The line protection design (no ground-fault monitoring, no communication module) makes this a straightforward thermal-magnetic breaker for branch or feeder duty — no extra electronics to fail or nuisance-trip in dirty power environments.
Panel fit and integration
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard SENTRON 3VA frame size that drops into the same DIN-rail or screw-mount cutout as other 3VA three-pole breakers. The 70 mm depth leaves clearance for rear-connection busbars or panel wiring behind the mounting plate. Comes with a shunt trip (STL) auxiliary release and two HQ auxiliary switches built in, so it can be remotely tripped and its status signaled back to a PLC or annunciator without adding external relays. No undervoltage release on this variant — if you need UVR protection, that's a different order code in the 3VA family.