... Price 4)Different type for Selection Automatic Voltage Switch,AVS,Voltage Protector,Power Protector,Multi Guard Model Number: AVS5A, AVS13A, AVS15A ... capability. Thus, the AVS13RL provides protection against over-voltage, under-voltage, power-back surges, spikes, and lighting.3) AVS30A: ... power goes outside preset limits (the window) and will re-connect automatically after about 3 minutes of the supply ...