Snap action thermostats

A snap action thermostatic switch comprising a permanent magnet fixedly positioned in a housing, contacts affixed to lower ends of a pair of straight rigid terminals insulated from each other, the upper ends of said terminals affixed perpendicularly through a header and electrically insulated therefrom, said lower ends of said terminals passing through clearance holes in said permanent magnet and electrically insulated therefrom, said terminals being in operative registry with a bridging contact attached to a facing side of a low mass Curie point moveable magnetic disc armature so that a temperature change in said disc of a given Curie alloy characteristic correspondingly changes its magnetic permeability to such extent that the pull of said permanent magnet overcomes the counteracting force of a compression spring located centrally in a cavity of the lower end of the permanent magnet thereby causing single pole double break contacts either to close or open an electric circuit.