The KSD.301-105/103PAB is a thermostat switch manufactured by Xucheng. This device is designed to be mounted through a hole with a diameter of 5 mm and is RoHS-compliant. It is composed of two parts: the KSD.301-105, a normally closed snap-action switch, and the 103PAB, a temperature-controlled disc that when nearby a heat source opens the switch contact. This part is a great option for products requiring a temperature-sensitive cutoff switch.