It protects a single-phase final subcircuit against both overload/short-circuit and earth leakage in one unit, saving a DIN-rail position over separate MCB+RCCB. Rated 230/240 V AC at 50 Hz, it carries a B-curve tripping characteristic (instantaneous trip between 3 and 5 times rated current) and a 30 mA residual-current sensitivity of type AC — meaning it detects sinusoidal AC fault currents only, not pulsating DC or smooth DC. That makes it a fit for general-purpose socket-outlet circuits, lighting, and small appliance loads where no variable-speed drives or electronic loads are downstream.
Temperature derating — the real-world current rating
The 10 A nominal rating only holds at 30 °C ambient inside the enclosure. At 40 °C it's 9.5 A; at 50 °C it's 9 A; at 60 °C it's 8.5 A; at 70 °C it's 8 A. The full derating curve is published for every 5 °C step from 30 °C to 70 °C.
At 36 mm wide (2 modular units), it occupies two standard 18 mm positions. Depth is 77 mm, installation depth 70 mm — check your enclosure's internal clearance if you're retrofitting into a shallow gland-plate area. Supply can enter from top or bottom; the neutral is switched (1P+N, not 2P). IP20 protection applies only when the distribution board is installed with connected conductors — the busbar stabs and terminals are live when the front cover is off, so standard finger-safe terminal shrouds or a dead-front enclosure are expected.