What this filter does in the drive cabinet
The Siemens 6SL3-203-0BE22-5AA0 is a 25 A EMI/RFI noise suppression filter, classified under Panel Accessories and specifically EMI, RFI, & EFI Noise Suppression Filters. It sits between the line supply and the drive input to attenuate conducted emissions from the inverter switching stage, keeping harmonics off the plant distribution bus. The 25 A rating governs the continuous current it can pass without saturating the common-mode choke core — sized for a drive drawing that full-load current, not the motor nameplate alone.