Digital monitoring relay for voltage monitoring, 22.5 mm for IO-Link AC/DC 10...600 V with over- and undervoltage hysteresis from 0.1 to 300 V, start-up delay time, and trigger delay time. It features one changeover contact with screw connection. The digitally adjustable voltage monitoring relay SIRIUS 3UG4 is designed to monitor voltages for over- and undervoltage conditions, for example, to protect a system from damage, to prevent battery deep discharge, or to activate a system at a defined voltage. It is suitable for worldwide use due to international certifications. The relay can be variably set for overvoltage, undervoltage, or window monitoring. Delay times and reset behavior are freely configurable. It requires less space in the control cabinet thanks to its narrow design. Reliable diagnostics are provided through the display of actual values and status messages. All versions come with removable terminal blocks. In addition to screw connection technology, the devices are also available with spring-loaded connections for quick, maintenance-free, and vibration-resistant connections. The devices differ between self-powered and externally powered options, available in wide voltage ranges or with IO-Link. The comprehensive accessories, such as device identification labels, insertion tabs, and cover caps, are uniform for all relays. SIRIUS relays - a program for all applications.