UL Certification. LPRC/2 Phase Failure, Phase Sequence, Under and Over Voltage plus Time Delay. Broyce Controls L-Series signal conditioners use a QR barcode marking method allowing direct access to all technical data sheets, ensuring correct information is always at your finger tips!. Features and Benefits. Compact 17.5 mm DIN Rail housing. Microprocessor based. True R.M.S. monitoring measuring phase to phase (three wire) or phase to neutral (4-wire) voltages. Selectable nominal voltages to suit most popular three wire or 4-wire supply voltages. Monitors own supply and detects if one or more phases exceed the set Under or Over voltage trip levels. Detects incorrect phase sequence, phase loss and neutral loss1. Adjustments for Under and Over voltage trip levels. Adjustment for time delay. Independent relay outputs - Under voltage monitoring / Over voltage monitoring. 2 x SPDT relay output 5A. Green LED indication for supply status. Individual Red LED indication for both relay statuses