Type A detection handles pulsating DC residual currents from rectified loads like washing machines, LED drivers, and small VFDs, which a plain AC type would miss. The C-curve (trips at 5–10× In) is the go-to for motor and compressor circuits where a brief inrush shouldn't nuisance-trip the RCD side.
This is a DIN-rail mount module, 1 module width (18 mm per pole, so 2 modules for the 1P+N form factor). Snaps into any standard TS35 rail inside a consumer unit or sub-distribution board. The neutral connects through the device internally, so no separate neutral bar link needed downstream of this RCBO — it switches and protects both line and neutral.