The industrial socket is located on the panel of the Type tap-off and requires a certain amount of horizontal installation space. When two rows of plug-in boxes are placed front and back, it is not convenient to plug and unplug the industrial socket. Therefore, when choosing a side-out line plug-in box, the plug-in boxes in front and back need to be staggered a little to facilitate the plugging and unplugging of the industrial socket. The plug-in box is equipped with a smart monitoring meter, which can monitor the full electricity load of the load, and is equipped with a working indicator light, which shows the voltage and current in real time; customers can choose between a side-out line or a bottom-out line plug-in box according to the site space conditions.