The PGR-4704 is a microprocessor-based ground-fault relay for resistance- and solidly grounded systems, which require ground-fault detection as low as 10 mA. It is uniquely suited for very sensitive ground-fault protection on systems with significant harmonic content. The PGR-4704 can provide main plant protection, feeder-level protection, or individual-load protection. The output contacts can be connected for use in protective tripping circuits or in alarm indication circuits. The analog output can be used with a PLC or a meter.