PE wire even disconnection reminding device of TN-S power supply system

The utility model belongs to the technical field of reminding devices, and particularly relates to a PE line even disconnection reminding device of a TN-S power supply system, which comprises a photoelectric coupling device, a power supply module, a control switch module and an acousto-optic buzzer alarm. And the control switch module is electrically connected with the acousto-optic buzzer alarm. The photoelectric coupling device comprises a light-emitting element and a photoresistor, the photoresistor is electrically connected with the control switch module through a wire, the light-emitting element is electrically connected to the power line through a wire, and the light-emitting element is arranged on one side of the photoresistor. According to the utility model, wiring is convenient, and only one PE line, one phase line and one zero line need to be connected. The device can be self-detected, when the detection button is pressed down, the simulation protection zero line is disconnected, at the moment, the