The Siemens 3VM1150-5EE36-0AA2 is a 3-pole IEC frame 160 molded-case circuit breaker with a 55 kA interrupting capacity at 415 V (class M). It ships with a TM220 thermal-magnetic trip unit, adjustable overload protection from 35 A to 50 A, and a fixed short-circuit pickup at 10 times the rated current (Ii = 10 x In). Terminal connections are standard for panel-mount bus or cable.
In a real panel, you coordinate this with the upstream transformer impedance and downstream load — if your available fault current is 30 kA, this breaker gives you a solid margin. The adjustable Ir (35 A to 50 A) lets you dial in the thermal trip to match the full-load amps of a motor or a feeder without swapping the trip unit.