由于我们目前的箱子也可能产生其他小故障电流，我们需要此信息，以便关闭断路器（RCD）没有任何流动的小变化。
Since our current boxes could also produce other small fault currents, we need this information so turn off the circuit breaker (RCD) not for any small variation of the flow.
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.
如有故障发生，熔断器会断开，使所有故障电流流经跳闸线圈，将断路器断开。
If a fault occurs, the fuse ruptures diverting all the fault current through the trip coil, tripping the breaker.
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