主开关主开关是在母排输入或输出端的线路断路器，所有的电流都要从那通过。
Main breaker a main breaker is a circuit breaker at the input or output of the bus, through which all of the bus power must flow.
第三条线路连接到PLC输入卡或控制系统上的输出端。
The third wire is the output which is connected to the PLC input card or the control system.
它可以被安装在几个位置上，但这些位置仅限于线路的高压侧，且在压缩机输出端和热力膨胀阀之间。
It can be placed in a selection of locations but it will always be found somewhere in the high pressure part of the circuit in between the compressor output and the thermal expansion valve.
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