Analog monitoring relay for phase sequence monitoring with 3 x 320 to 500 V AC and 50 to 60 Hz. It features a changeover contact with screw connection and is the successor product to the network monitoring relay 3UG3511-1AQ50 with fixed function. The SIRIUS 3UG4 relay monitors phase sequence, failure, and asymmetry, for example, in mobile applications such as air conditioning compressors, refrigeration containers, construction site compressors, or cranes. It is suitable for worldwide use due to international certifications. Different variants allow for application-specific product selection. The space requirement in the control cabinet is minimal thanks to the narrow design. All versions are equipped with removable terminal blocks. In addition to the screw connection technology, the devices are also available with spring-loaded terminals for a quick, maintenance-free, and vibration-resistant connection. Variants with a wide voltage range without auxiliary voltage can be used in all networks worldwide. 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.