This is the world's first developed leakage current prevention device with proven practicality. With this equipment, we can use the electricity safely without worrying about the electric shock where we should use electricity in the water as well as the humid area. This item must be suitable in Japan where there are a lot of natural disasters. These items are made for 220V one phase and 380V three phases can be used in the following applications, and we can develop it for 100V also without any problems. - Food factory - Underground utility tunnels - Underground workshop - Fish farms - Street light poles - Smart farms - Disaster prevention device