Abstract: A thermostatic switch is shown having a body supporting a temperature sensing probe formed of a rod of one thermal coefficient of expansion connected to a channel of a different thermal coefficient of expansion. The difference in expansion between the rod channel is translated through a hinge to an overbalance type switch mounted on the body. The temperature at which the switch actuates is adjustable through an element movable toward and away from the switch by a cam mechanism as well as an independent threaded adjustment. The switch is shown in one embodiment as having an integral movable switch arm and loading spring and in a second embodiment as having a discrete movable switch arm and a discrete loading spring.