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The working principle of CHINT Push Button NP2-11BN belongs to that of a self-resetting normally open + normally closed (1NO+1NC) control button. It is based on the core structure of mechanical linkage + spring reset, and is specifically divided into three stages: initial state, pressed state and reset state. The detailed breakdown is as follows:
- Core Structural Support
The interior of the button mainly consists of five core components: button actuator, reset spring, moving contact assembly, stationary contact set (1 set of normally open stationary contacts + 1 set of normally closed stationary contacts), and terminal blocks.
The moving contact is a movable conductive component connected to the reset spring.
The stationary contacts are fixed on the base, corresponding to the normally open (NO) and normally closed (NC) terminal blocks respectively.
The contacts made of copper alloy ensure excellent electrical conductivity and wear resistance.
- Phased Working Process
| Working Stage | Operation Action | Contact State Change | Circuit Control Logic |
| Initial State (Unpressed) | No external force applied | The reset spring is in a naturally extended state, pushing the moving contact into tight contact with the normally closed stationary contact; the normally open stationary contact remains disconnected from the moving contact | The normally closed circuit is conducting and the normally open circuit is disconnected; in the corresponding control circuit, the equipment/components associated with the normally closed contact are energized, while those associated with the normally open contact are de-energized |
| Pressed State (External Force Applied) | Apply downward pressure to the button head | The pressure overcomes the spring elasticity and pushes the moving contact to move downward: it first separates from the normally closed stationary contact (the normally closed circuit is disconnected), and then comes into contact with the normally open stationary contact (the normally open circuit is closed) | The normally closed circuit is cut off and the normally open circuit is connected; in the corresponding control circuit, the equipment associated with the normally closed contact stops working, while the equipment associated with the normally open contact starts working |
| Reset State (External Force Released) | Remove the pressure applied to the button head | The elasticity of the reset spring pushes the moving contact to rebound upward and return to the initial position: it separates from the normally open stationary contact and re-establishes contact with the normally closed stationary contact | The normally open circuit is cut off and the normally closed circuit is conducting; the control circuit returns to its initial state, and the operating state of the equipment resets accordingly |
- Functional Advantages and Application Logic
The core function of the self-resetting design is to prevent prolonged on-off of the circuit caused by misoperation. For example, when used for jog control of a motor, the motor will only run when the button is pressed continuously, and stop immediately when the button is released, avoiding long-term no-load operation of the motor.
The 1NO+1NC dual-contact configuration can simultaneously realize two opposite control logics. For example, in a motor control circuit, the normally open contact controls the start of the motor, and the normally closed contact can interlock to control the on and off of the stop indicator light.
