The Siemens 5SM9325-6KN is a SENTRON RC unit electronic, 2-pole, type A residual current device rated 63 A at 230 V AC, 50 Hz, with a 30 mA tripping threshold and instantaneous response. Type A detection means it handles pulsating DC fault currents superimposed on AC — common in modern loads with rectifiers or switching power supplies.
Integration
Instantaneous design (no intentional time delay) means it trips within milliseconds of a fault — pair it with a downstream overcurrent device for selectivity coordination.