We know that overvoltage and undervoltage protection devices are an important voltage protection devices. It is often installed on the power supply entrance of distribution box. Its main function is to protect the circuit or load when the circuit is over-voltage or under-voltage. Its working principle is very simple, when the circuit overvoltage or under-voltage, the protector can cut off the power supply for the circuit and load protection; when the circuit voltage returns to normal, the overvoltage and undervoltage protector with self-recovery function (i.e. automatic recovery function) can automatically turn on the power supply.

Although the working principle of the overvoltage and undervoltage protection devices sounds very simple, the whole working process is very complex. The whole working process needs the interaction of processing module, data adoption module, power-off module, self-replicating module, delay module, indicating module and alarm module. The working process of the product.

When the data sampling module monitors the voltage in the circuit in real time, when overvoltage or undervoltage is detected in the circuit, the processing module will send a signal directly to the delay module, and the delay module receives the signal and counts down the delay time. When the delay time passes, the circuit is still in the state of over-voltage or under-voltage, then the signal is sent to the power-off module and the indicator module at the same time. When the power cut module receives the signal, it directly interrupts the power supply. At the same time, the indicator lamp of the indicator module immediately lights up the corresponding overvoltage or undervoltage indicator lamp. If there is a protector with the alarm function, it will give an alarm.

When the data sampling module detects that the power supply of the circuit is restored to normal voltage, the data sampling module sends a signal to the processing module, the processing module receives the signal, and the control delay module is timed. After the delay time, the circuit voltage is still at normal voltage, the self-recovery module immediately turns on the power supply, indicating the positive of the module. The constant power indicator lights on.

The above is the whole overvoltage and undervoltage protection devices from normal voltage to over-voltage or under-voltage, and then to the normal voltage of the working process, the entire process or through the interaction of each module, the information exchange between each module, and ultimately achieve the protection circuit and the role of electric load.

How to use the voltage protection devices:

1. When the product input is connected to the power for the first time, it takes 20 seconds -2 minutes to load the power.

2. When the voltage exceeds or below the action voltage of the protector, the protector can quickly and reliably cut off the load power supply. When the voltage returns to normal, the protector automatically turns on the power supply, restores the power supply, and realizes automatic processing. The double-color LED on the panel indicates the working state of the protector, the power supply is normal when the light is green, and the red light protection function starts and cuts off the power supply.

3. Protector is an over-and-under-voltage protection action with inverse time characteristics, that is, the greater the load over or below the normal voltage value of the product, the shorter the protection action time of the product, otherwise the longer the above is the whole voltage protection devices from normal voltage to overvoltage or under-voltage, and then to normal voltage of the working process, the entire process. Or through the interaction of each module, the information exchange between each module, and ultimately to protect the circuit and the role of electricity load.