This is a type AC device — it detects sinusoidal AC residual currents only, not pulsating DC or smooth DC faults, so it is suited for standard resistive and inductive AC loads where no electronic rectification is present.
Snaps onto DIN rail (REG), occupies 4 width units (72 mm wide), and accepts conductors from 1.5 mm² up to 25 mm² solid or stranded. IP20 with conductors connected — standard for enclosed distribution boards.
The 500 mA trip threshold is higher than the common 30 mA or 100 mA RCCBs used for personnel protection. This 500 mA unit is intended for equipment protection or fire prevention on circuits with high natural leakage — think large industrial loads, heaters, or long cable runs where a 30 mA device would nuisance-trip.