Phase imbalance monitoring relays, Product range: EMR Measuring and monitoring relays, Power supply from the measuring circuit, On delay: None = 0 or adjustable from 0.1 to 30 s, Imbalance threshold values adjustable 2 - 25 % of mean value of phase voltages, Monitoring voltage per phase: UN= 300 - 500 V AC, 50/60 Hz V AC, Monitoring of: Phase sequence, Phase failure, Imbalance, Adjustable threshold values: Imbalance, Supply voltage: 300 - 500 V AC, 50/60 Hz, Mounting position: As required, Fixing: Snap fixing, top-hat rail IEC/EN 60715, Width: 22.5 mm, Standards: IEC/EN 60255-6, IEC255-6, UL, CE