Arc light is a short circuit between the charged body and the earth or between the charged bodies through the ionized gas (air). The high-energy arc light fault is electrical explosion. They release a lot of energy in the form of radiation, heat, strong light and high-pressure waves. The harm degree of arc fault depends on arc current and cutting time.

There are many reasons for the arc light, such as the short circuit of equipment caused by improper operation for human reasons, and the arc light protection device can quickly cut off the fault in case of internal failure of the equipment, which plays an important role in the safe operation of the distribution system. But the arc protection device is not completely able to protect the equipment from internal faults. First of all, it is necessary to ensure the normal operation of the device in order to remove the fault accurately.

The manufacturer of smail arc protection summarizes for the majority of users which conditions will cause damage to the arc protection device or abnormal operation of the device:

1. Auxiliary power supply voltage out of range

2. Distribution system frequency out of range

3. Incorrect polarity of current input

4. Terminal wiring is not connected as required

These are the precautions when installing the arc protection device. From the first step, it is necessary to be vigilant. From the beginning of installation, it is necessary to operate in strict accordance with the steps, so as to accurately cut out the fault in case of internal failure of the equipment and protect the safety of the person and equipment.