Microcontroller based.
True RMS measurement
Parameters setting by knobs
N phase failure protection for 3phase 4 wire
1NO+1NC output-8A
LED indication for supply and output state
1 module Din-rail mounting
Three phase voltagemonitoring relay is used to protect the three-phase electric motors supplied from three-phase mains, against phase failure, incorrect phase sequence, voltage asymmetry, over and under voltage.

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