What is the definition of current protection?

When the circuit is short circuit, one of the important characteristics of the line is a sharp increase in the current, when the current flow through a predetermined value, the response to the current rise in the action of the protective device called overcurrent protection.

The Overvoltage protection value has a potentiometer on the panel, which can be set manually. The Overcurrent protection value can not be manually set, the machine has been fixed dead, generally rated current 1.2~1.5 times. What needs to be explained is that the Overvoltage protection immediately starts quickly, the Overcurrent protection has a second or so delay. This is because, if the power supply is working normally, such as a sudden short-circuit of the load, the power output instantaneous current is several times or dozens of times times the rated current value, can be considered as a current impact, far more than the Overcurrent protection value, but at this time does not want to overcurrent protection effect. And hope that after the short circuit, the voltage automatically return to normal. Therefore, in the design of overcurrent protection, to avoid the sudden short-circuit of the current impact, but only to allow the output of the current length of time to achieve a certain value before the start of overcurrent protection.