Abb residual current devices rcds f200 series 30ma abb f 202 ac 250 03 a 2 pole rccb from the abb f200 series the 25a 30ma rccb will assure protection to people and installations against a current fault to earth the rccb will trip when ground faults are detected in excess of the trip rating of the devicethe rccb is only sensitive to current leakage to earth it must be used in series with an mcb or fuse which protects it from the potentially damaging thermal and dynamic stresses of any