The Siemens SENTRON 3VA2063-5HL36-0JA0 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 curve to chase. Breaking capacity is the headline: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V.
That 105 mm width is three pole spaces on a standard DIN-rail or panel-mount grid — no surprises for a 3-pole MCCB. The 86 mm depth means it clears most shallow enclosures, but check your gland-plate clearance if the breaker is mounted near the back wall.