To prevent unusual overheat accidents resulting from a glow contact formation in a conductor connection part.

An electrical switching device, such as a receptacle, includes a line conductor circuit having a first temperature, a neutral conductor circuit having a second temperature, and a load terminal. Separable contacts are adapted to electrically connect the line conductor circuit and the load terminal. An operating mechanism opens the separable contacts in response to a trip signal. A first diode temperature sensor outputs a first signal representative of the first temperature of the line conductor circuit. A second diode temperature sensor outputs a second signal representative of the second temperature of the neutral conductor circuit. A difference circuit determines a difference between the first and second signals. A trip circuit provides the trip signal responsive to the difference.