Discontinued product. The preferred successor is 3UG5514-2BR20. Analog monitoring relay for phase failure and sequence, adjustable undervoltage, asymmetry fixed at 20%, 3 x 160 to 690 V AC, 50 to 60 Hz, hysteresis fixed at 5%, delay time 0-20 s, 2 changeover contacts. Spring-loaded technology. Analog adjustable network monitoring relay SIRIUS 3UG4 for monitoring phase sequence, failure, and asymmetry and/or undervoltage, e.g., for mobile installations such as air conditioning compressors, refrigerated containers, construction site compressors, or cranes. Global use due to international certifications. Different variants allow for application-specific product selection. Reduced space requirement in the control cabinet thanks to a narrow design width. 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. Variants with a wide voltage range without auxiliary voltage can be used in all networks worldwide. 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.