Type A residual protection catches pulsating DC fault currents (typical from rectified loads) as well as sinusoidal AC.
Snap-on DIN-rail mount for standard 18 mm per pole enclosures. The 1+N form factor occupies two modules — one for the line pole (overcurrent + residual) and one for the switched neutral. Wiring in and out via tunnel terminals; torque to the value marked on the device side.