The Schneider Electric A9D10845 is an Acti9 iC60H RCBO — a residual current breaker with overcurrent protection, combining a 45 A thermal-magnetic MCB (curve C) and a 10 mA earth-leakage detector in a single 18 mm wide module that clips onto a DIN rail. Rated 45 A at 50 °C, it handles the load current for a final subcircuit while the 10 mA sensitivity catches leakage to ground — the kind of spec you see on circuits supplying wet areas or equipment where personnel protection matters.
Clip-on mounting on a DIN rail, 18 mm wide (2 x 9 mm pitches), neutral on the left, with screw-clamp terminals accepting up to 25 mm² rigid on the top and 16 mm² on the bottom. Torque settings: 3.5 N.m on the top (line) connection, 2 N.m on the bottom (load). Strip length 14 mm top, 13 mm bottom.