The electronic part 14D101K is a Varistor 85V 165V 4.5KA Through Hole RoHS manufactured by COV. It is a nonlinear resistor device used in AC (alternative current) power lines to protect against voltage surges such as those caused by lightning strikes. The varistor has two main characteristics: a rated voltage and an energy surge capacity. The rated voltage is the voltage at which the device begins to conduct, and the energy surge capacity is the maximum amount of energy the device can absorb before it fails. The voltage rating of the 14D101K is 85V to 165V and its surge capacity is 4.5kA. The device is RoHS compliant, indicating that it meets lead-free and conflict-free standards. This varistor is designed to be mounted in a through hole configuration, meaning it is soldered directly to the printed circuit board.