Method of detecting run-dry conditions in fuel systems

A power line fault response device, comprising:

• sensor circuitry configured for sensing an operational aspect of a power line;
• analog signal processing circuitry configured to detect electrical current in the power line and configured to perform an output operation in response to detecting a fault comprising a variation in the detected electrical current;
• digital signal processing circuitry comprising a processor and memory that is configured to detect electrical current in the power line based on the operational aspect and to perform the output operation in response to detecting a variation in the detected electrical current;
• wherein the analog signal processing circuitry and the digital signal processing circuitry are each configured to operate independently and simultaneously to respond to faults as they occur to prevent a detected fault from damaging a load being supplied with power by the power line.

A power line fault response device comprising:

• sensors configured for sensing an electrical current of a poly-phase power line;
• analog-to-digital circuitry that receives analog signals from the sensors;
• processor circuitry comprising a memory that is configured to receive digital signals from the analog-to-digital circuitry and to monitor the digital signals for conditions indicative of faults;
• means for comparing the digital signals to known values in the memory to determine a fault condition;
• and means for terminating the fault condition.