Harmony Control. This multifunctional voltage monitor is used in direct and alternating voltage networks and enables monitoring of overshoot or undershoot of an adjustable limit value (15-600 VAC/DC). The limit value, the switching hysteresis and a switch-off delay can be set. Two relay changeover switches are available at the output, which can be loaded up to 5 A. An error memory can be selected as an option, which holds the message until a reset. 2 LEDs show the device status. The wide-voltage power supply (24-240 VAC/DC) enables universal use. The cable connection is made via screw terminals.