Digital monitoring relay for voltage monitoring, 22.5 mm, from 17-275 V AC/DC. Over- and undervoltage detection, self-powered, surge delay from 0.1 to 20 s, hysteresis from 0.1 to 150 V, 1 changeover contact. 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. 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 parameterizable. Reduced space requirement in the control cabinet thanks to a narrow design. Reliable diagnostics through display of actual values and status messages. All versions come with removable connection terminals. 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 are available as self-powered or externally powered, optionally in wide voltage range 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.