PTC (resettable fuse) technology utilizes a unique Lead-Free polymer-based, Positive Temperature Coefficient (PTC) material to protect electrical circuits from over-current conditions. During normal operation, numerous carbon paths within the polymer allow the device to conduct electricity. As current through the PTC (resettable fuse) reaches its rated threshold, the polymer material begins to heat causing the polymer to expand. The resulting expansion breaks the carbon chains to reduce the current through the circuit to a small leakage current. The increased resistance in the resettable fuse works to protect circuitry by limiting potentially damaging current. When the fault (overcurrent) is removed from the circuit, the PTC (resettable fuse) will reset itself thereby allowing current to flow through the circuit again.