Prok dv's make Earth Leakage Relay (ELR) MPEL series uses the state-of-the-art, Digital
microprocessor/micro controller based protection device to detect low level leakage due
to degradation of insulation of phase conductors or high impedance faults.The main feature
of Digital microprocessor/microcontroller Earth Leakage Relay (ELR) continuous display of
earth leakage currents of the power system. The unit has immunity to external disturbance
like harmonics and transients.