Littelfuse 601-CS-D-P1 Three-Phase Programmable Power MonitorLittelfuse 601 CS D P1 Power Monitor Description The 601 CS D P1 3 phase power monitor is a fully programmable electronic power monitor designed to monitor 3 phase systems. The 601 CS D P1 has a single relay that can be configured as a general purpose network output or to trip on ground faults. The 601 CS D P1 monitors ground fault current, phase currents, phase voltages, power factor and frequency. The RS485MS 2W communications module allows the 601