What it is and what the ratings mean
The Siemens 3VM1163-5EE46-0AA2 is a 4-pole molded-case circuit breaker in the 3VM1 IEC frame 160 series, rated 63 A continuous with a 55 kA interrupting capacity at 415 V AC (class M). That Icu figure tells you it can safely clear a fault up to 55,000 amps without welding its contacts or bursting the case — critical for high-fault panels where upstream coordination matters. The TM220 thermal-magnetic trip unit gives you adjustable overload protection from 44 A to 63 A (Ir) and a fixed short-circuit pickup at 10 times In (Ii = 630 A), so it's set up for general distribution or light motor branch protection right out of the box.
Where it goes and how it mounts
This breaker snaps onto a DIN rail or mounts via the 3VM1 frame's screw-in base — common in IEC-style panelboards and MCCs. The 4-pole configuration with an unprotected neutral conductor (N conductor unprotected) means the neutral pole is not switched; it's a pass-through terminal for systems where neutral isolation isn't required (e.g., solidly-grounded wye). Terminal connections accept standard lug or pin terminals; the frame 160 footprint matches other 3VM1 accessories like shunt trips, auxiliary contacts, and rotary handles.