电源开关的工作原理是让电流脉冲穿过触点和触面之间。

The switch works by passing a pulse of current between the tip and the surface.

《柯林斯英汉双解大词典》

电触头亦称触点或接点，是电器开关、仪器仪表等的接触元件，担负着通断电流的任务。

Electrical contact also called contact or contact junction, is the contact component of electric switch, instruments and meters and so on, which takes on the task of current on or off.

youdao

电动机和控制电压应连接到一个公用网，从这里，当发生电流断路时，电力开关的触点被断开。

The motor- and control voltage is to be connected to a common network, where the sealing-in of the power contactor is cancelled in case of an interruption of circuit.

youdao