It is suitable for circuits with AC frequency of 50HZ and rated working voltage below 500V. Under special requirements, the protection level can reach P55. There are knock-out holes on the top and bottom of the box, and a pre-installed perforated plate can be reserved for multi-tube incoming lines. Low voltage distribution box-JXF series Overview JXF Series distribution box is a kind of distribution equipment with various control functions assembled based on the type, specification and quantity of components. Low. Note: The indoor concealed box can be customized. For any damage due to one of the following situations, a paid repair duct, please dispose the pro ype, a “R” is added after the Specification. For single row. The JXF distribution box is suitable for 50Hz, 500V and below three-phase three-wire, three-phase four-wire, and three-phase five-wire systems with load currents not exceeding 250A. It provides control, leakage protection, and motor overload, short-circuit, phase-loss protection, as well as various.