Residual Current Circuit Breaker (RCCB), Easy9 series, 4P, with a rated current of 40 A and a residual sensitivity of 300 mA, Type AC. It detects sinusoidal leakage currents and disconnects all four poles when the residual current reaches the specified threshold. The Easy9 model with these specifications is designed for 400/415 V AC, 50 Hz networks.