These are Sollatek AVS30 Automatic Voltage Switchers designed to protect appliances from power fluctuations.Voltage Protection: These devices safeguard equipment by disconnecting power when voltage levels drop too low or surge too high.Applications: They are ideal for protecting large electrical items such as air conditioners, large fridge/freezers, and whole office setups.Specifications: The AVS30 is rated for a maximum load of 30 Amps.Time Delay: The devices feature an adjustable delay time to ensure appliances do not receive power immediately after a surge, allowing voltage to stabilize