Discontinued product. The preferred successor is 3UG5616-2CR20 PH.FOL.PH.AUSF.3X160-690V FEDER. Digital monitoring relay for 3-phase voltage with neutral conductor, selectable phase sequence, phase failure 3 x 90 to 400 V AC 50 to 60 Hz, under- and overvoltage 90-400 V, hysteresis 1-20 V for 0-20 s for Umin and Umax, 1 W for Umin, 1 W for Umax. Digitally adjustable network monitoring relay SIRIUS 3UG4 for monitoring 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. 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. Less space required in the control cabinet thanks to a narrow design width. Reliable diagnostics through display of actual value and type of network fault. All versions come with detachable 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. They are also available in various voltages, optionally with IO-Link or with 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.