The trip is caused by a short circuit fault, resulting in low voltage, which will cause the electrical equipment to not work properly and require repair. Turn off all electrical appliances, and unplug any electrical appliances that have plugs; use a 100-level multimeter to measure whether the live wire and protective wire of each socket are connected. If it is connected, it proves that the live wire and the protective wire are short-circuited. Open each socket and check one by one. Turn on the main switch again to see if it trips.