The Siemens SENTRON 3VA2063-8HL32-0AA0 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. It's built for line protection duty, with an ETU320 electronic trip unit that gives you adjustable thermal-magnetic curves. The interrupting ratings are serious: 440 kA at 240 V, 330 kA at 415 V, and still 52.5 kA at 690 V. That kind of SCCR headroom means it can sit upstream of a fault-heavy distribution panel without worrying about cascading failure.
What the ratings mean for your panel
The 63 A frame is flat-rated — it holds that current from 40 °C up to 70 °C ambient, so you don't have to oversize for a hot enclosure. The 800 V rated insulation voltage means it's comfortable on 480 V or 600 V class systems with margin. The IP40 front protection is standard for a panel-mounted MCCB: it keeps tools and fingers out, but it's not sealed against washdown. Mounts on a DIN rail or direct panel; the 105 mm width and 86 mm depth fit a standard distribution board footprint.