The operation is described of a novel dielectric element which can stabilize its own temperature within narrow limits in the highly nonlinear region close to the Curie temperature. The device employs a triglycine sulphate (TGS) single crystal, and its operation is based on heating due to dielectric loss that is a strong function of temperature near the Curie point. The element operating in this autostabilizing state exhibits extremely high dielectric nonlinearities up to the high‐frequency region, the nonlinearities being only little dependent on the changes of ambient temperature, which was experimentally proved in the range from −35° to +45°C. The element has various applications; e.g., frequency multiplier, mixer, frequency modulator, pulse position modulator, dielectric amplifier, electrometer, electromechanical transducer, transducer sensitive to heat transfer, etc.