Residual Current Circuit Breaker (RCCB), Easy9 series, 2P configuration, with a 40 A nominal current and 300 mA residual sensitivity, Type AC. It detects sinusoidal AC leakage currents and disconnects both poles when the residual current reaches the specified threshold. This description corresponds to the Easy9 model EZ9R66240, designed for a 230 V AC network.