It is necessary to prevent induction motors against overload and undervoltage.
必须保护感应电动机，防止过载和欠压。
Feeders located in capital cities must not use voltage Regulators to solve undervoltage problems.
位于省会城市的馈线线路(设备)绝不能使用电压调节装置来解决低电压问题。
The SL version has one function, either undercurrent or undervoltage, with a PDT for signal output.
SL 版具有单功能，在低电流或低电压的情况下，信号输出具有PDT。
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