The Siemens SENTRON 3VA1163-4ED16-0AA0 is a 1-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, with a TM210 thermal-magnetic overcurrent release. It's built for line protection in distribution panels — the 25.4 mm width per pole keeps the footprint tight on a DIN rail, and the interrupting rating of 75.6 kA at 240 V AC covers high-fault service entrance or feeder applications.
The 63 A current rating holds across 40–50 °C ambient, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C — so in a hot panel you lose about 5 A at the top end. The 75.6 kA interrupting at 240 V AC is the headline number for North American service; at 415 V AC it's 9 kA, which still clears most European distribution faults.