Stable electric insulation to reduce cathodic protection current.
稳定的电绝缘性，降低阴极保护电流。
Protection devices of maximum current steady and cut-off electric circuit avoid further damage of failure phone circuit board.
最大电流恒定及截止式电路保护装置，免除故障手机线路板进一步损坏。
Submersible pump in order to prevent the work in the underwater leakage accidents caused by electric shock should be equipped with residual current protection switches.
为防止潜水泵在水下工作时漏电而引发触电事故，应装有漏电保护开关。
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