They are a type of medium pressure switchboards in which switching equipment is sf6 gas or vacuum.. Therefore, the dimensions of these panels are smaller than ordinary medium pressure panels. The panel has a separate box for installing the secondary relay and meter. The board can be expanded from two sides.The roof and back of all cells have an opening valve during an explosion. The frame of these panels is made of galvanized sheet with a thickness of 2 mm, in which there is the ability to install a variety of circuit breakers and current and voltage disconnectors for measurement. The advantages of this type of panel as a result of reducing the dimensions of the substation are ease in transportation and installation of the panel due to its small size and weight, expandability, and the ability to install various voltage and current transformers.