Its use position is on the plug of the water heater.
This kind of plug is called leakage protection plug.
As long as the missing plug does not fail, the possibility of electric shock death is very small.
Therefore, it is recommended that you buy solar water heaters from big manufacturers, which is very good to omit.
The leakage protection plug is used to detect the "residual current" in the "grounding" loop. Its working principle is to insert two power wires (live wire and zero wire) of the plug into the center hole of a special "zero sequence current transformer" at the same time. When the electrical appliance is in normal use, the current flowing through the live wire and the neutral wire is completely equal, and the secondary coil of the current transformer has no voltage output as soon as there is current in and out. When there is "residual current" in the "ground loop" (including the ground loop), the currents passing through the two power lines of the transformer are unbalanced, and a voltage signal proportional to the current will be generated at the output end of the "current transformer". As long as the voltage signal is large enough, the thyristor on the trigger board will turn from off to on after being amplified by the integrated circuit of the special circuit board, so that the trip coil connected in series in this circuit will be energized, thus disconnecting the main circuit trip device.
Leakage protection plugs are widely used for leakage protection of electric heating tables, storage water heaters, hair dryers, electric clips, electric scissors, vacuum cleaners, electric tubs, electric water heaters, rice cookers, televisions, refrigerators, microwave ovens, washing machines, dishwashers, disinfection cabinets, water dispensers, computers, power tools, medical devices, instruments and meters.
The leakage protection plug is small and convenient, with a wide voltage range (100-240V), which is suitable for different countries and different places of use (different voltages and leakage currents), and corresponding plugs and wires can be used. According to customer demand, it has the characteristics of excellent materials (more durable).