Most applications utilize LED power conversion and control assembly connected to various power sources, such as the AC cord, solar panels or battery, to control the LED driving device power dissipation. Protection of these interfaces, preventing them from over-current and over-temperature due to damaged, often used with a resettable polymeric positive temperature coefficient ability (PPTC) component (Figure). In series with the power input a PolySwitch LVR components, and prevent electrical short circuit overload or user errors and damage. In addition, on the input side of the metal oxide varistor (MOV) over-voltage protection also helps LED module. Typical switching power supply protection circuit: