Tripolar earth -leakage protector

The utility model provides a tripolar earth -leakage protector, include: a three -phase half -bridge rectifier module, its input is connected to three phase current, a voltage reducing module and a dropout module, it is established ties at this three -phase half -bridge rectifier module's output, sample its output that is connected to this voltage reducing module and processing module for one, and one be used for control the switch components and parts of dropout module are connected the input of dropout module, and be used for receiving sampling and processing module's control signal, under the condition that takes place the electric leakage, sampling and processing module output control signal, so that the switch components and parts can be put through, and then make the disconnection of dropout module. According to the utility model discloses a tripolar earth -leakage protector can effectively reduce the quantity of diode for the structure is compacter, simultaneously because the voltage that the rectification goes out is lower, makes the inside temperature rise of its product less.