The principle of button switch wiring is simple: it is to connect the switch contacts to the circuit to achieve the connection and disconnection of the circuit. Button switches typically have two contacts, a moving contact and a stationary contact. The moving contact is movable and changes with the pressing and releasing of the button. The stationary contact is fixed and does not change.
Normally Closed Wiring
In a normally closed (NC) wiring, the moving contact is connected to the circuit, while the stationary contact is connected to the open circuit. When the button is pressed, the moving contact closes with the stationary contact, thus completing the circuit. When the button is released, the moving contact opens from the stationary contact, thus breaking the circuit.
The characteristics of a NC wiring are that the circuit is open when the button is not pressed, and the circuit is closed when the button is pressed. NC wiring is commonly used to control the start and stop of motors, the on and off of lights, and other applications.
Normally Open Wiring
In a normally open (NO) wiring, the moving contact is connected to the open circuit, while the stationary contact is connected to the circuit. When the button is pressed, the moving contact opens from the stationary contact, thus breaking the circuit. When the button is released, the moving contact closes with the stationary contact, thus completing the circuit.
The characteristics of a NO wiring are that the circuit is closed when the button is not pressed, and the circuit is open when the button is pressed. NO wiring is commonly used to control the stop and start of motors, the off and on of lights, and other applications.
Self-Locking Wiring
In a self-locking wiring, the moving contact is connected to the circuit, while the stationary contact is connected to the open circuit. The moving and stationary contacts are connected in series with a power supply circuit. When the button is pressed, the moving contact closes with the stationary contact, thus completing the circuit. The moving and stationary contacts also close with each other, thus forming a self-locking state. When the button is released, the moving and stationary contacts remain closed, and the circuit remains closed.
The characteristics of a self-locking wiring are that the circuit remains closed after the button is pressed once. Self-locking wiring is commonly used to control the continuous start of motors, the continuous lighting of lights, and other applications.
When wiring a push button switch, you need to keep the following in mind:
In addition, you need to consider the following factors:
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