Harmony Control. This current monitoring relay monitors a conductor for exceedance or undershoot of the set limit value (1.5-15 A). You can choose between exceedance, undershoot and overshoot and undershoot in window mode. An error memory is optionally available, which holds the error message until a reset. Two relay changeover switches are available for reporting, which can be loaded up to 8 A. The mode of operation, the limit value, the switching hysteresis and a drop-out delay can be set. The settings are made using control elements on the front, which can be protected against changes under a transparent cover. An illuminated scale arrow makes it very easy to see the setting of the potentiometers, even from a distance. The diagnostic switch on the front enables the output relays to be switched off to test the entire application. When the transparent cover is closed, the diagnostic switch is automatically reset. The supply voltage is 380-415 VAC. Two LEDs show the status. The width is 35 mm and it is mounted on a top hat rail. The cable connection is made via screw terminals.