Digital monitoring relay for 3-phase voltage with neutral conductor, switchable phase sequence, and phase failure. It operates at 3 x 90 to 400 V AC and 50 to 60 Hz, with under- and overvoltage protection from 90-400 V. The hysteresis is 1-20 V for 0-20 s for Umin and Umax, with 1 W for both Umin and Umax. The relay has a screw terminal connection and is the successor product to 3UG3042-1BP50.

The digitally adjustable network monitoring relay SIRIUS 3UG4 monitors phase sequence, failure, and asymmetry, as well as under- and overvoltage, for example, in unstable networks or mobile applications such as air conditioning compressors, refrigerated containers, construction site compressors, or cranes. It is suitable for worldwide use due to its wide voltage supply and international certifications.

The relay can be variably set for over, under, 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 types of network faults. 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.

They are also available in various voltages, optionally with IO-Link or automatic rotation direction correction. The comprehensive accessories, such as device labeling plates, insertion tabs, and cover caps, are uniform for all relays. SIRIUS relays - a program for all cases.