The Siemens 5SM1312-6FD is an FI-Protector Type A residual current device (RCD) with overcurrent protection, rated 25A, 2-pole, 30mA rated residual current (IFN), for 230V AC systems. It occupies 2 module spaces (2TE) on a DIN rail and has a 55mm depth.
Deployment context
Snap-on DIN rail mounting for standard 35mm rail in distribution boards or sub-distribution panels. The 2TE width (approx 36mm) fits a standard modular enclosure slot. Rated for 230V AC line-to-neutral or line-to-line single-phase circuits where both poles need to be switched and protected — typical for final subcircuits supplying socket outlets, lighting, or small equipment in commercial and industrial installations.