Why do you need this?- To protect your home appliance from damage due to sudden voltage and current fluctuations Multi-Protection: -This product cover all three protection range i,e Over voltage, under voltage and over load protection with action time of 0.1 sec. Range: – Over voltage protection ranging 230~300V, under voltage protection ranging 140~210V and over current protection ranging 1~63A. Auto Reconnect: – In case of voltage fluctuations, the device instantly cut off the power supply. When supply is back to normal, the device automatically reconnect supply within 1~500 sec (adjustable) Adjustable: – You can adjust reconnect time and cut of values as per your requirement. Note:- Maximum sustainable voltage of this device is 440V. In case of surge this product will destroy itself without damaging your appliances. Your appliances will safe.