What the ratings mean for fit
The 3VM1120-5EE46-0AA2: The headline number is Icu=55kA at 415 V AC — that is the ultimate short-circuit breaking capacity, the maximum fault current the breaker can safely interrupt once. For a 160 A frame, 55 kA at 415 V puts it in the M (medium) breaking capacity class, which covers most industrial distribution panels fed from a transformer of 1000 kVA or less. If your available fault current at the panel exceeds 55 kA, you step up to the H (high) or L (very high) class in the same frame. The TM220 thermal-magnetic trip unit gives you adjustable overload protection (Ir) from 14 A to 20 A, and fixed instantaneous short-circuit protection (Ii) at 16 times In — that is 320 A magnetic pickup. For a 20 A breaker protecting a feeder or a downstream sub-panel, the 16x In setting means it will ride through motor inrush without nuisance tripping, but verify coordination with the upstream device. The N conductor is unprotected — this is a 3-pole breaker with a solid neutral bar, common for 3-phase 4-wire systems where the neutral is bonded at the source and not switched.
Panel integration & wiring
This is a 4-pole breaker in a 160 A IEC frame. It mounts on a DIN rail or can be screw-fixed to a backplate. The terminal connection is listed as unprotected for the N conductor — that means the neutral lug is a solid bar, not a switched pole, so it stays connected when the breaker is off. For a panel OEM, this simplifies wiring in a 3-phase + N distribution board: land the neutral once and leave it. The TM220 trip unit is field-adjustable for Ir via a dial on the front face; no need to open the cover or swap rating plugs. The 55 kA interrupting rating at 415 V means this breaker can be used as the main incoming device in a panel with a transformer up to roughly 1000 kVA, assuming the fault current at the panel terminals is within that limit.