Abstract: The application of electric power from a power source to a load is controlled by detecting the magnitude of electric current flowing to the load and producing a first signal level that is indicative of that magnitude. The first signal level is compared to a reference signal level which comparison produces an output signal. Either the first signal level or the reference signal level is altered in response to variation of voltage applied to the load. This results in the output signal indicating when electric power consumed by the load exceeds a threshold level. The flow of electric current from the power source to the load then is controlled in response to the output signal.

Abstract: A programmable controller reduces the power used by the relays. The controller design permits energization of relay coils without subsequent maintenance of the relatively high voltage required for energization. The design permits the voltage across the relay to be lowered to an activated relay coil maintenance level with a design that minimizes the space required for the relay circuitry.