Low power (under-voltage) will damage any refrigeration appliance’s compressor and High Power (Over voltage) will damage any electrical or electronic equipment. The VoltGuard combines the protection of the FridgeGuard and HivoltGuard by disconnecting the power when it goes below or above un-acceptable level. Additionally, there is a delay when power returns to normal. This will ensure that the appliance is not switched on-off repeatedly during fluctuations nor it is subjected to a massive surge normally experienced when power returns after power cuts.