It's a 2-pole unit rated 40 A continuous, with 300 mA sensitivity, Type A (pulsating DC and sinusoidal AC residual currents). The 220-240 V AC 50/60 Hz operational voltage covers standard single-phase supplies across most European and Asian distribution boards. Mounts via clip-on onto DIN rail — the 36 mm width (two modular pitches) fits standard enclosure cutouts. The white housing carries a toggle control and a contact-position indicator; a padlocking provision locks the toggle for lockout/tagout. Neutral is on the left, and the terminals accept up to 35 mm² rigid or 25 mm² flexible conductors, with a stripping length of 14 mm and tightening torque of 3.5 N·m.
It's not for personal shock protection — that demands 30 mA or lower. Type A detection covers the pulsed DC waveforms from single-phase rectifiers (common in washing machines, LED drivers, VFDs), so this RCCB is suited for mixed residential and light commercial loads. The 6 kV impulse withstand voltage (Uimp) means it survives transient surges from nearby lightning or switching without internal flashover. Electrical durability is 15,000 cycles under AC-1 (resistive load), mechanical durability 20,000 cycles. That's a solid service life for a distribution board that cycles a few times a year — not a daily-switched load, but it will outlast the building fit-out.
The 8/20 µs impulse withstand test at 250 A (per the same standard) confirms the device's immunity to surge currents without nuisance tripping. IP20 on the terminals, IP40 inside a modular enclosure — fine for dry indoor panels; not for washdown areas.