[POE-100 / POE-100S] How PoE products avoid damages from power-surge?

When power-surge occurs, the output voltage and current of transformer will increase or decrease on a sudden, which will burn out the device or shut it off. Either is not good to the device. With PoE, the electric power applied to remote device has been regulated by POE-100S. Therefore, even power surges, only POE-100 is affected. Through POE-100S, remote device still can get a stable power supply.