The Siemens 3VA2063-5HN36-0KL0 is a 3-pole SENTRON molded case circuit breaker rated for 63 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V, so it handles high-fault service-entrance or distribution positions where SCCR headroom matters. The line-protection design means it's tuned for cable and busbar protection, not motor overload curves. Max power loss is 5.4 W, which keeps heat out of a crowded enclosure.
Footprint is 181 mm high by 105 mm wide by 86 mm deep. It's a standard MCCB form factor for DIN-rail or panel-mount backplate layouts.