Discontinued product. The preferred successor is 3UG5616-2CR20 PH.FOL.PH.AUSF.3X160-690V FEDER. Digital monitoring relay for 3-phase network voltage, switchable phase sequence, phase failure 3 x 160 to 690 V AC, 50 to 60 Hz. Under- and over-voltage 160-690 V, hysteresis 1-20 V for 0-20 s for Umin and Umax, 1 W for Umin, 1 W for Umax. Spring-loaded technology, digitally adjustable network monitoring relay SIRIUS 3UG4 for monitoring phase sequence, failure, and asymmetry as well as under- and over-voltage, e.g., in unstable networks or mobile installations such as air conditioning compressors, refrigerated containers, construction site compressors, or cranes. Global use due to wide voltage supply and international certifications. The relay can be variably set for over-, under-threshold, or window monitoring. Delay times and RESET behavior are freely parameterizable. Reduced space requirement in the control cabinet due to a narrow design width. Reliable diagnostics through the display of actual values and types of network faults. 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. They are also available in various voltages, optionally with IO-Link or with 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.