It integrates a Type A residual current device (RCD) rated at 30 mA with a C-characteristic miniature circuit breaker (MCB) rated at 40 A, all in a 230 V AC single-phase form factor.
The Type A RCD at 30 mA means this unit detects sinusoidal AC residual currents plus pulsating DC residual currents up to 6 mA smooth DC — the standard requirement for circuits with single-phase rectified loads (washing machines, LED drivers, IT equipment). The 30 mA trip threshold provides personal protection against direct contact, not just fire prevention. The 40 A rating is sized for a 40 A final submain or a high-demand ring/radial final circuit.