Intelligent power controller
 A remotely controllable circuit breaker and switch for controlling the flow of current from a three phase AC power source to a three phase load, and usable in either wye or delta configurations. A latching relay controls the current for each phase. Current samples in the three phases are scaled and converted to DC values by scalers and RMS to DC converters. The DC values are converted to digital current values by an analog-to-digital converter which sequentially scans the DC values of the currents in the three phases. A central processing unit monitors the digital current values to detect significant phase imbalances and overcurrents which persist for time periods which exceed allowable limits according to a predetermined time-dependent function, and to initiate opening of the relays in response thereto. The central processing unit also opens and/or resets the relays in response to remote control signals. The relays are opened in a zero-crossover mode when the currents exceed predefined threshold values; and in order to minimize the effects of noise are opened without regard to zero crossover when the currents are below said threshold values. Relay status contacts are employed to reduce power consumption during relay operation by terminating relay coil drive pulses when the relay contacts have achieved the desired state. 
Struthers-Dunn, Inc.
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Laurence C. John J. Martin C.
Bakely Martelli, Jr Horowitz