Siemens SIEM mains monitoring relay

Digital adjustable monitoring relay for phase failure, phase sequence, asymmetry, frequency, as well as over- and under-voltage monitoring, with or without neutral conductor and phase sequence correction. It is suitable for 3x 90-690 V AC and 15-70 Hz and features 2 changeover contacts with screw terminals. The digital network monitoring relay SIRIUS 3UG5 monitors phase sequence, failure, and asymmetry, under- and over-voltage, as well as frequency, for example in unstable networks or mobile installations such as air conditioning compressors, refrigerated containers, construction site compressors, cranes, or solar and wind power plants. It is globally applicable thanks to wide voltage supply and international certifications.

The relay is variably adjustable for over, under, or window monitoring. Delay times and RESET behavior are freely parameterizable. It requires less space in the control cabinet due to its narrow design. Reliable diagnostics are enabled by displaying the actual value and type of network fault. All versions come with removable connection terminals. In addition to screw connection technology, the devices are also available with spring-loaded terminals for a quick, maintenance-free, and vibration-resistant connection. An automatic rotation direction correction is available upon request. A variant with IO-Link is available for communication connectivity. Additionally, devices with SIL 1/PL c certification are available.

The comprehensive accessories, such as device identification labels, replacement terminals, and sealing covers, are uniform for all relays. The network monitoring relays 3UG5 replace the proven series 3UG4. SIRIUS relays - a program for all cases.