What is the reason for the trip of the main switch of the electric meter?

It may be that the loose connection of the pile head leads to heat, or even burns out the insulation layer, which leads to the undervoltage operation of the line, and the master brake will trip automatically after sensing it. It may be because the actual power load of the line exceeds the rated current of the main brake. When several electrical appliances are put into operation together, the main brake will trip. It may be because of an electric leakage accident that the main brake will trip when it senses it.