Phase monitor, product range: measuring and monitoring relays EMR, multifunctional, power supply from measuring circuit, response/release delay: none = 0 or adjustable 0.1 - 30 s, threshold values and asymmetry adjustable 2 - 25 % of the mean value of the phase voltages, three-phase networks, monitoring voltage per phase: UN= 300 - 500 V AC, 50/60 Hz V AC, monitoring of: phase sequence (can be deactivated), phase failure, overvoltage, undervoltage, asymmetry, supply voltage: 300 - 500 V AC, 50/60 Hz, installation position: any, fastening: snap-on fastening DIN rail IEC/EN 60715, width: 22.5 mm, standards and regulations: IEC, UL, CSA, CCC, GL