Boundary protector

The utility model discloses a boundary protector which comprises a control base, an upper pole is arranged at the upper end of the control base, a lower pole is arranged at the lower end of the control base, a drop-out fuse is installed between the upper pole and the lower pole, a current sensor, a voltage sensor and a conductive rod are arranged in the upper pole, and the conductive rod is connected with the current sensor. A voltage sensor high-voltage end of the voltage sensor is connected to the conductive rod, and a current signal leading-out end of the current sensor and a voltage signal leading-out end of the voltage sensor are connected with the control base; compared with a traditional boundary switch device, the boundary protector provided by the utility model has the advantages that the current sensor and the voltage sensor are arranged in the upper pole, so that fault judgment can be carried out on a distribution line connected with the boundary protector; therefore, when a fault occurs in the dis