The Siemens SENTRON 3VM1163-3ED12-0AA0 is a 1-pole molded case circuit breaker (MCCB) with a TM210 thermal-magnetic release, rated 63 A at 40 °C and carrying a 53 kA interrupting capacity at 240 V AC — that's the figure that governs fault clearance on a 240 V line, not the 8 kA at 415 V.
The 63 A rating holds from 40 °C up to 50 °C, then derates linearly to 58 A at 70 °C. That means in a warm panel — say 55 °C — you're still good for 62 A continuous. The 1-pole width is 25.4 mm (1 inch), so it occupies one module on a DIN rail; depth is 70 mm, which fits standard distribution boards without a deep enclosure.
Panel integration
Snap-on DIN-rail mount, 25.4 mm wide per pole.