It protects a single-phase final circuit against overload, short-circuit, and earth leakage, all in one DIN-rail unit.
The 20 kA figure gives headroom for industrial panel applications where fault currents may exceed 10 kA; the 10 kA rating covers the domestic/commercial coordination requirement.
Two modules wide (36 mm), 77 mm deep, 90 mm tall. Neutral conductor is switched internally (1P+N configuration), so no separate neutral bar is needed downstream. Supply can enter from top or bottom — no mandatory orientation. Touch-protected terminals reduce the risk of accidental contact during wiring. IP20 rating applies once installed in a distribution board with conductors connected; the device itself is not rated for wet or dusty environments.