It's a 3P+N block rated for 40 A continuous current and 30 mA earth-leakage sensitivity, tripping instantaneously — no intentional delay, so it's for group incomer or sub-distribution where you want fast fault clearing, not selectivity with downstream RCDs.
Voltage-independent tripping means the RCD doesn't need a separate power supply or the line voltage to operate; it uses the fault current itself to trigger the mechanism, so it works even if the neutral is lost upstream. That's a reliability advantage for group incomers where you can't count on the supply being clean during a fault. The 4 kV impulse withstand is standard for this class per EN/IEC 61009-2-1. That's standard for a DIN-rail mounted RCD in a distribution board — not a switching device for frequent load cycling, but fine for its role as a protective device that mostly sits closed.
Clip-on mounting on DIN rail, 108 mm wide (6 x 9 mm pitches), 99.5 mm high, 74 mm deep. Neutral is on the left. IP20 on the body, IP40 inside the modular enclosure — fine for a distribution board, not for washdown.