Shengfan electronic meter shows that sup tripped and returned to normal.

Overload, short circuit, overvoltage and undervoltage, and leakage protector failure.

According to Baidu Library, when the load consumes more power than the rated power of the electric meter, it will lead to overload and trip of the electric meter. The solution is to reduce the load and wait for the meter to return to normal after closing. When the circuit is short-circuited, it will cause the instrument to trip. The solution is to check the circuit and close the circuit after eliminating the short circuit fault. When the voltage is too high or too low, the meter will trip. The solution is to turn on the power supply after the voltage returns to normal. If a leakage protector is installed, it is caused by the failure of the leakage protector. The solution is to check whether the leakage protector works normally. If there is any problem, you need to contact a professional for repair or replacement.