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The role of the key switch

The button switch can complete basic control such as start, stop, forward and reverse rotation, speed change and interlock. There are five terminals, one of the three contacts side by side in the middle is connected to the power supply, the other two are normally open, one is normally closed, and the other is The two LED terminals at both ends are the LED terminals of the button, which are connected to the power supply and the ground wire respectively.