The Siemens 3VA1120-5EE32-0AA0-ZD00 is a 3-pole IEC frame 160 molded-case circuit breaker with class M breaking capacity — 55 kA at 415 V. The thermal-magnetic trip unit (TM220, ATFM) gives you adjustable overload protection from 14 A to 20 A and a fixed short-circuit pickup at 16 times the rated current (In=20 A).
In a real panel, that governs whether the breaker coordinates with upstream gear (transformer secondary, main breaker) and whether it meets the available fault current at its mounting point. The adjustable overload Ir (14–20 A) lets you dial in the exact motor or feeder load without swapping trip units, which saves a panel rewire if the load changes slightly.