KA5为跳闸报警继电器。当设备产生偏励磁、可控硅故障、过电流等故障时，KA5吸合，断路器分励线圈得电跳闸，切断主电源。
When there are bias excitation, controllable silicon failure, over current and other failures, KA5 gets absorbed and breaker loop trips by powered on so as for switching off main power supply.
主机总电源开关不能启动：检查主令继电器是否损坏，过流继电器是否跳闸。
Total mainframe power switch could not be activated: check whether the Master relay is damaged, whether the flow relay tripped.
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