Harmony Control. This network monitoring relay monitors three-phase networks (220-480 VAC in 6 stages) for phase sequence, phase failure, phase asymmetry (5-15%), overvoltage and undervoltage in window mode (-20--2%/+2-+20% depending on voltage). Two relay changeover switches are available for reporting, which can handle up to 5 A. The limit value can be set for the asymmetry, undervoltage and overvoltage range and a switch-off delay can be set for the output. The settings are made using controls on the front, which can be protected against changes under a transparent cover. Three LEDs show the status. The width is 35 mm and it is mounted on the top hat rail. The cable is connected using screw terminals.