Digital monitoring relay for voltage monitoring, 22.5 mm, from 0.1-60 V AC/DC for over- and undervoltage detection. Supply voltage: AC/DC 24 V DC and AC 50 to 60 Hz without galvanic isolation from the measurement circuit. Surge delay from 0.1 to 20 s, hysteresis from 0.1 to 30 V. 1 changeover contact with or without fault memory, screw connection. Successor product to 3UG3531-1AC. Digitally adjustable voltage monitoring relay SIRIUS 3UG4 for monitoring voltages for over- and undervoltage conditions, e.g., 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 over- or undervoltage or window monitoring. Delay times and RESET behavior are freely parameterizable. Reduced space requirement in the control cabinet thanks to a narrow width. Reliable diagnostics through display of actual value and status messages. All versions come with removable terminal blocks. In addition to screw connection technology, the devices are also available with spring-loaded terminals 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. Comprehensive accessories, such as device identification labels, insertion tabs, and cover caps, are uniform for all relays. SIRIUS relays - a program for all applications.