Siemens 5SM1612-6BA FI Protector Type A, 25A 2-Pole 0.3A 230

The Siemens 5SM1612-6BA is a Type A FI protector (RCD) in the N series, rated 25 A, 2-pole, with a 0.3 A residual current rating at 230 V. It occupies 2 TE on a DIN rail — standard for panel integration in distribution boards where earth leakage protection is required on a single-phase circuit. Type A detection means it catches sinusoidal AC faults plus pulsating DC components — the typical waveform from rectified loads like switched-mode power supplies, variable-speed drives, and LED drivers. If your line has electronics downstream, Type A is the floor; a standard AC-only RCD would nuisance-trip or fail to detect a pulsating DC fault.