!!! Discontinued product !!! The preferred successor is 3UG5514-2BR20 PH.FOL.PH.AUSF.3X160-690V FEATHER Digital monitoring relay asymmetry 0-20% switchable phase sequence phase failure 3 x 160 to 690 V AC 50 to 60Hz undervoltage 160-690 V hysteresis 1-20 V switch-on and switch-off delay 0-20 s 2 changeover contacts spring-loaded technology Digitally adjustable mains monitoring relay SIRIUS 3UG4 for monitoring phase sequence, failure and asymmetry as well as undervoltage and overvoltage, e.g. in unstable networks or mobile systems such as air conditioning compressors, refrigerated containers, construction site compressors or cranes. Worldwide use thanks to wide voltage supply and international certificates. The relay can be variably set to over-, under- or window monitoring. Delay times and RESET behavior can be freely parameterized. Less space required in the control cabinet thanks to a narrow width. Reliable diagnostics through display of actual value and type of network error. All versions with removable connection terminals. In addition to screw connection technology, the devices are also available with spring-loaded connections for a quick, maintenance-free and vibration-proof connection. They are also available in various voltages, optionally with IO-Link or with automatic direction of rotation correction. The comprehensive range of accessories, such as device identification plates, push-in tabs and cover caps, is standardized for all relays. SIRIUS relays - a program for all cases.