What this breaker delivers
The Siemens 3VA1332-5EF42-0AA0-ZD00 is a 4-pole IEC frame 400 circuit breaker rated In=320A with a TM240 thermal-magnetic trip unit. Its Icu=55kA @ 415V puts it in breaking capacity class M — high enough for most industrial main or feeder applications where the fault current at the panelboard stays under that threshold. The overload protection band Ir=224A...320A and short-circuit protection Ii=5...10 x In give you a wide adjustment window to coordinate with downstream devices without swapping trip units.
Application context
The 3VA1 frame mounts on a standard DIN rail or panel-mount base inside an enclosure. The 4-pole configuration suits three-phase loads with a switched neutral (N conductor unprotected, per the spec). The nut keeper kit for DC Power OEM in China is included — a detail that matters if you are integrating this into a DC-side distribution assembly. For AC motor or transformer feeder duty, the TM240 curve provides inverse-time thermal protection and instantaneous magnetic pickup; set Ii to 5 x In for general distribution or 10 x In for high-inrush loads.