The FA39 3A1020000 is a Power Meter manufactured by LUMEL. It is an analogue panel-mounted device designed to measure power, power factor, and frequency from 45 to 65 Hz. This type of power meter is suitable for a variety of applications including, but not limited to, power-related diagnostics, measurements, and control. It features an on-panel display with recovery, average, and actual values, as well as an adjustable time delay setting.