Digital monitoring relay for voltage monitoring, 22.5 mm, from 10 to 600 V AC/DC. Over- and under-voltage monitoring for supply voltage: AC/DC 24 V DC and AC 50 to 60 Hz without galvanic isolation from the measuring circuit. Surge delay from 0.1 to 20 s, hysteresis from 0.1 to 300 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 under-voltage 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-voltage, under-voltage, 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 value 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 differ in 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.