1. Momentary: When the button is pressed, once the finger is released, the button will automatically bounce back to the original unpressed state immediately.
2. Latching: When the button is pressed, the button will remain in the pressed state. To return the self-locking button to its original state, the button needs to be pressed again.
1. Normally open (NO) contact: In its normal state, the contact is disconnected and no current passes through. Current can flow through the contact only when the button is pressed, at which point the contact closes and the road is connected.
2. Normally closed (NC) contact: In its normal state, the contact is closed and the current can pass normally. When the button is pressed, the contact will disconnect instead, cutting off the current path.
【Normally open contacts are used in many control circuits to start devices, while normally closed contacts are often used to stop functions.】

