GNDSeries
 Neutral-Earth Regulator
 GNDSeries is a model from the Trimbox brand, and its feature is to prevent damage to sensitive electronic devices and circuit boards by regulating the potential difference between neutral and ground. While performing this task, it also prevents image distortions on monitor screens (including projectors), which are generally considered to be interference caused by ground faults.
 Neutral - Ground Voltage
 GND 1/5 between 0-5V
 GND 1/10 between 5-10V
 GND 1/20 between 10-20V
 If it is higher than 20V, you can choose the GND 1/25 product.