在检测到待机信号时，单片机控制继电器开关，将电流切断，家电完全断电，消除了待机功耗，达到节能的目的。
When detecting standby signal, microcomputer gives structure to relay switch to cut off the current, then standby power is eliminated so as to realize energy saving.
温度继电器检测电动机温度，超过额定温度发出信号，接触器切断主电路，完成电机保护。
Temperature relay tests temperature of motor, if it exceeds rating temperature to send a signal, contactor cut off main circuit to complete protection of motor.
①分别接通各个接触器，依次拨通相应的限位开关和过电流继电器常闭触头，查看其切断控制电流的能力。
Respectively through the various contacts, in order to dial the corresponding limit switches and over current relay normally closed contacts, to see the ability to cut off the control current.
柜内的电路中还装有气体压力调节继电器，以便在柜体漏气造成其内气压过低时及时切断电路。
An air pressure regulating relay is arranged in a circuit in the cabinet to cut the circuit in time when air leak happens in the cabinet body to make the air pressure in the cabinet too low.
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.
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.
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