The C characteristic handles motor-start inrush and general-purpose loads; the Type A residual-current element detects pulsating DC fault currents up to 300 mA, covering the majority of modern electronic loads in commercial and light-industrial panels.
The 25 A rating and C characteristic coordinate with downstream MCBs for selective tripping; the Type A 300 mA residual element provides earth-fault protection for circuits feeding single-phase electronics, VSDs, or IT equipment. Verify the neutral bar arrangement for the 2-pole configuration before wiring.