The Siemens SENTRON 3VA2063-6KP32-0AA0 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. The ETU850 electronic trip unit handles line protection with communication capability — you get remote monitoring and adjustable curves, not just a thermal-magnetic fixed trip.
At 440 V it still delivers 187 kA; at 500 V it drops to 121 kA; at 690 V the rating is 3 kA — the part is optimized for 240–500 V distribution, not for 690 V main breakers. Insulation voltage is rated at 800 V.
Front protection is IP40, meaning it's splash-proof from the front but not sealed against hose-down — keep it in a dry enclosure or a panel with a door. Maximum power loss is 5.4 W — negligible for thermal budgeting inside a crowded panel.