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 features a screw terminal connection and is the successor product to 3UG3042-1BP50.

The digitally adjustable network monitoring relay SIRIUS 3UG4 monitors phase sequence, phase failure, and phase asymmetry, as well as under- and overvoltage, for example, in unstable networks or mobile installations 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 parameterizable. It requires less space in the control cabinet thanks to its narrow design. Reliable diagnostics are provided by displaying the actual value and type of network fault. All versions come with removable connection terminals. In addition to screw connection technology, the devices are also available with spring-loaded terminals for a quick, maintenance-free, and vibration-resistant connection.

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 across all relays. SIRIUS relays - a program for all cases.