Abstract: A temperature responsive regulator switch for controlling the heat of an electric heating device, comprises movable and stationary electric contacts cooperating with one another for assuming open and closed positions and a bimetal operatively coupled to the movable contact for moving it into the open position when the bimetal attains a predetermined temperature. The bimetal is heated by electric current passing therethrough solely in the closed position. The regulator switch further has a heat conductor having a first part adapted to be directly exposed to the heat of the device controlled by the temperature responsive regulator switch and a second part being in a heat-conducting connection with the bimetal for heating the bimetal by the heat generated by the device.

Abstract: A remotely controlled switching apparatus for selectively controlling the connection of a downhole device to a power cable which carries power to a downhole motor includes a thermostatic switch connected between the device and the cable, and a heater for producing sufficient heat to raise the temperature of the switch above its operating temperature. The heater is operated by a switching signal impressed upon the cable by a control and readout unit on the surface. The apparatus may be used to disconnect the device from the cable for a predetermined period of time to enable high voltage testing. After the predetermined period of time, the apparatus automatically reconnects the device to the cable.