Digital monitoring relay for voltage monitoring, 22.5 mm, from 0.1-60 V AC/DC for over- and undervoltage detection. AC/DC 24 to 240 V, DC and AC 50 to 60 Hz. Surge delay from 0.1 to 20 s, hysteresis from 0.1 to 30 V. 1 changeover contact with or without fault memory. Spring-loaded technology. Digitally adjustable voltage monitoring relay SIRIUS 3UG4 for monitoring voltages for over- and undervoltage detection, e.g., to protect a system from damage, to prevent battery deep discharge, or to activate a system at a defined voltage. 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 width. Reliable diagnostics through display of actual value and status messages. All versions come with detachable 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 differ between self-powered and externally powered options, optionally available in wide voltage range or with IO-Link. The comprehensive accessories, such as device labeling plates, insertion tabs, and cover caps, are uniform for all relays. SIRIUS relays - a program for all applications.