secondary protection meaning in English
二级保护
Examples
- Discussion on secondary protection connection mode of potential transformer
保护用电压互感器二次接线方式的探讨 - Secondary protection shall be a pin expulsion type element complete with mechanically operated limit switch
我想应该是：二级保护是一个连同机械的可操控限极开关的安全针排气类型的元件。