The Siemens SENTRON 3VA1163-4EF36-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 63 A at 40 °C with no derating up to 50 °C. The 121 kA interrupting rating at 240 V AC gives you headroom for high-fault service-entrance or distribution panels; at 415 V it still holds 75.6 kA, and at 690 V it's rated 11.9 kA. That's a single breaker that covers both 240 V and 400 V class systems without a frame-size jump.
Sizing and thermal performance
At 55 °C it drops to 62 A, at 65 °C to 60 A, and at 70 °C to 58 A. That's a shallow curve; you can run this breaker near its full rating in a warm enclosure without oversizing.
Auxiliaries and releases
No undervoltage release is installed, and no ground-fault monitoring module is included.
Width is 76.2 mm (3 in), depth 70 mm (2.76 in), height 130 mm (5.12 in). Power loss is 17.3 W maximum at rated load, so plan for that heat in the enclosure thermal calculation.