Abstract: In a thermal switch for temperature control of electrical heating apparatus, a contact reed is integral with a terminal and is rigid except for a relatively short longitudinal area so that, when the contact reed is acted upon by a bimetallic disk spring, a hinge type movement of the contact reed will result.The integral rigid design of this component designed as terminal and contact reed makes keeping the geometric conditions within the thermal switch, especially the space between the contact reed and the bimetallic disk spring, at closer tolerances, much easier than with prior leaf springs used as a contact reed. Accomplished thereby is a more dependable switching performance and thus a quality improvement in large-scale manufacture and a reduction in manufacturing costs.

Abstract: A resettable thermal safety switch having a bistable domed bimetallic disc serving as a heat-responsive switching element which pops from its normal curvature to an opposite curvature, thereby moving a contact breaking plate, the switch having a reset button which is arranged to return the disc to its normal state and to close the switch, but between the reset button and the moving parts of the switch is arranged a force-limiting assembly which prevents resetting or blocking of the switching action at the critical temperature.

Abstract: A non-resettable heat responsive safety switch featuring two contact sleeves inside a jacket with a displaceable intermediate contact body of metal granulate, a preloaded compression spring biasing the contact body in the direction of contact interruption, a normally solid trigger body of fusible material holding the contact body in its normal, sleeve-bridging position, against the spring bias, until, at a critical temperature level, the trigger body yields to the spring which moves the contact body and breaks contact in the switch.