Acrel ASJ Series Residual Current Relay can meet the leakage protection requirements, and at the same time, it can be used with the remote control trip switch to cut off the power supply in time, prevent indirect contact and limit the leakage current. It can also be directly used as a signal relay to monitor power equipment. It is especially suitable for the safety protection of electricity used in schools, commercial buildings, factory workshops, bazaars, industrial and mining enterprises, national key fire protection units, intelligent buildings and communities, subways, petrochemicals, telecommunications and national defense.