The PTCTL4MR350STE from Vishay is a Positive Temperature Coefficient Thermistor that is ideal for over-temperature/overload protection in the main distribution frame, central office switching, subscriber terminal equipment, and set-top box applications. It has a voltage rating of 600 V and a current rating of 1 A. It can withstand high voltage levels and overload currents, thereby resulting in robust protection against power contact faults. This thermistor is coated with a high-temperature silicon lacquer to protect against harsh environments, which enhances its lifespan. It is available in a through-hole package that measures 11 x 8 mm.