JXF control box is suitable for three-phase three-wire, three-phase four-wire, three-phase five-wire systems with 50Hz, 500V and below, and load current not greater than 250A. It controls the power distribution system, leakage protection, and motor overload, short circuit, and lack of phase protection and various controls. The box is reasonable in design, small in size, beautiful in appearance, safe and reliable in use, and is widely used in metallurgy, petrochemical, medical and health, aviation, residential quarters, shopping malls, schools, and urban reconstruction.