company news about What is the actual fusing time of the fuse

        The actual fusing time of the fuse can be divided into two stages: pre-arcing time and arcing time.

The pre-arcing time is also called the pre-arcing time, which refers to the time interval from the moment when the current value is large enough to fuse the fuse element to the moment when the arc starts to form. The pre-arcing time accounts for most of the fusing time.

        The arcing time refers to the time interval from the moment when the arc appears to the moment when the final arc is extinguished. Under normal circumstances, the arcing time only accounts for a small part of the fusing time, and can even be ignored.

        The fusing process of the fuse can be recorded with an oscilloscope. From the waveform, we can clearly identify the pre-arcing time and arcing time. The ideal pre-arcing time is only the first larger and wider peak, which occupies most of the area of the entire waveform; while the arcing time is the following smaller and narrower peaks, which only occupy the entire waveform. Very small portion size.

        When testing or inspecting the fusing characteristics of the fuse, the fusing time we record is often only calculated for the pre-arcing time, and some calculate the time when the current waveform drops by more than 90%; under normal circumstances, for the standardization and repetition of the test The test of the resistance and fusing characteristics is done with a DC constant current power supply, and there will be a big difference between the AC test and the DC test.

        When testing or inspecting the breaking capacity of a fuse, we pay attention not only to the action time of the entire cut-off circuit, but also to maintain the rated voltage on the test circuit after the fuse is blown for 30 to 60 minutes to ensure that the fuse does not break. There will be re-conduction or unsafe phenomenon. The breaking capacity can be divided into two standards: DC breaking and AC breaking. For the standardization and repeatability of the test, the AC breaking must ensure that the switch is closed when the voltage crosses 30 degrees of phase.