When the industrial electronic control handle is used as current regulation in DC circuit, the current will pass through the sliding arm of the industrial electronic control handle. Due to the action of anodic oxidation, the resistance value will increase abnormally. In this case, it is recommended to connect the terminals connecting the resistor to the negative and the sliding arm to the positive. If DC current passes directly through the industrial electronic control handle, the anode of the industrial electronic control handle will be oxidized and damaged, increasing the impedance of the industrial electronic control handle. Therefore, it is recommended to connect the cathode of current to the terminal contacting the carbon diaphragm and the anode to the terminal contacting the brush (contact of industrial electronic control handle). When the industrial control handle is used as a variable resistance, it is recommended to be used as a voltage divider. The load resistance R1 of the electric control handle should not be less than 10 times the nominal resistance RT. It is used to regulate the output voltage of the voltage regulator. Therefore, the industrial electronic control handle should be designed to increase the output voltage when it is adjusted clockwise. In the adjustable constant current charger, the industrial electronic control handle should be used to adjust the charging current multiple. When designing the industrial electronic control handle, the clockwise direction should be filled. When adjusting the handle, the current will increase.