APPLY SCOPE: INLK18-32 SERIES LEAKAGE CORCUIT BREAKER The residual current device is applicable in single phase circuits for the prevention of persons from electric shock, it can also be used for the protection of circuits and apparatus against overload, over voltage and potential conflagration caused by earth-fault current when the insulating function of the device is destroyed and for the protection of circuit of the device against short circuit if it in series with the circuit of RL fuse. ect