The Siemens 5SV3345-6KK01 is a 4-pole residual current operated circuit breaker (RCCB) from the RCCBs product family, rated at 125 A with a 30 mA trip sensitivity and 400 V AC supply. The Type A detection handles pulsating DC fault currents from rectified loads — VFDs, switched-mode supplies, and single-phase drives common on a paper machine line. The short-time delayed characteristic prevents nuisance tripping from transient leakage in wet sections or during motor startup, which keeps the machine running without unplanned downtime.
What the ratings mean for fit
125 A continuous at 400 V AC covers the main feeder for a moderate motor control centre or a downstream distribution board. The 30 mA trip threshold is the standard for personnel protection — it clears a ground fault before fibrillation current is reached.
Integration notes
The 4-pole form factor occupies four modular DIN-rail spaces (78 x 97 x 85 mm packaging dimensions). Terminate the incoming supply on the top, load on the bottom — standard for panel builders. The short-time delay means it coordinates with downstream 30 mA instantaneous RCCBs; verify the grading in your selectivity study before commissioning. No auxiliary contact is integrated on this variant; if remote trip indication is needed, order the separate signal contact accessory from the same family.