Key ratings and what they mean for fit
The Siemens 3VA1163-4EE32-0AA0-ZD00 is a 3-pole IEC frame 160 molded-case circuit breaker. Its breaking capacity is Icu=36kA at 415V. The thermal-magnetic trip unit (TM220, ATFM) provides overload protection adjustable from Ir=44A to 63A via a dial, and a fixed short-circuit pickup at Ii=10 x In (630A). For a BOM line, this means the breaker is sized for a 63A feeder; the adjustable Ir band lets you fine-tune it to the actual continuous load without swapping the entire device.