Pressure limit switch circuit is cut off, stop, and then closing, the hook can only decrease.
压下限位开关，切断电路停车，再合闸时，吊钩只能下降。
2
The ignition switch allows the driver to start and stop ignition by opening and closing the circuit between the electrical engry source and the other ignition components.
驾驶员可通过开关电动源和点火元件之间的电路来开始启动和熄火。
3
The burn of circuit breaker closing coils and contactors is a common problem in the switchyard operates.