Discontinued product. The preferred successor is 3UG5618-2CR20 PH.FOL.PH.AUSF.3X160-690V FEDER. Digital monitoring relay for 3-phase network voltage with automatic phase sequence correction and phase failure detection. It is suitable for 3 x 160 to 690 V AC at 50 to 60 Hz, with under- and overvoltage protection from 160-690 V. Hysteresis of 1-20 V, switch-off delay of 0-20 s, and asymmetry of 0-20%. It requires 1 W for phase correction and 1 W for network fault detection. The digital, adjustable network monitoring relay SIRIUS 3UG4 monitors phase sequence, phase 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 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 takes up less space in the control cabinet thanks to its narrow width. Reliable diagnostics through display of actual values and type of network fault. All versions feature removable terminal blocks. In addition to screw connection technology, the devices are also consistently 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 identification labels, insertion tabs, and cover caps, are uniform for all relays. SIRIUS relays - a program for all cases.