Patent ID: 7460348

Claim:
An overload detector/enunciator circuit comprising: a power supply connected to an electrical distribution system and providing power to the overload detector/enunciator circuit; a reference signal generator providing a reference signal representative of a desired value of at least one component of the electric power provided by the power supply to the electrical distribution system; a power quality signal taken directly from the electrical distribution system and being representative of the actual value of the same component of the electric power in the electrical distribution system as provided by the reference signal generator; a power supply overload detector receiving the reference signal and the power quality signal, the overload detector deriving an alarm threshold from the reference signal, evaluating the power quality signal with respect to the alarm threshold and providing a power supply overload signal when the power quality signal is below the alarm threshold, the power supply overload signal indicating that power consumption in the electrical distribution system is exceeding the power supply capacity, and; at least one enunciator device providing an alarm in response to receiving the power supply overload signal.