There are some disadvantages existing in the actual residual current annunciator—when somebody gets an electric shock, before shake off the electric source, the person is in danger of high-voltage far from the human safety voltage.
目前不间断电源漏电保护中采用的剩余电流报警器存在以下不足:当人触电后,在摆脱电源之前,人一直处在危险电压(远大于人的安全电压)触电过程中。