Line Monitoring Relays for 3-phase grids from 200 V to 690 V nominal voltage

Certification according to SIL 1 (IEC 62061) and PL c (EN ISO 13849-1) standards for a wide range of applications

  • Line Monitoring Relays for 3-phase grids from 200 V to 690 V nominal voltage
    Line Monitoring Relays for 3-phase grids from 200 V to 690 V nominal voltage

Siemens has launched a new generation of line monitoring relays. The SIRIUS 3UG5 line monitoring relays combine proven technology with new functions and applications. The relays are the easiest way to monitor standards-compliant grid stability and quality, ensuring proper system operation and a long service life of components such as motors or compressors. Grid monitoring relays are used in critical areas such as hospitals or the process industry, which require a high-quality, fail-safe supply of power. 

Increased system availability

The new SIRIUS 3UG5 line monitoring relays provide maximum protection for mobile machinery and equipment or in the event of unstable grids. This ensures that grid and voltage faults can be detected and reported at an early stage before major subsequent damage occurs. Creeping changes that indicate a need for maintenance, for example, are recorded as well. In order to react flexibly to short-term disturbances such as voltage dips or load changes, the monitoring relays have adjustable delay times. This avoids unnecessary alarms and shutdowns while increasing system availability. Depending on the variant, the relays monitor phase sequence, phase failure with or without monitoring of the neutral wire, frequency, phase asymmetry as well as undervoltage or overvoltage. The 3UG5618 relay also offers automatic correction of the direction of rotation.

Easy device replacement

Compared to the industry standard, the new SIRIUS 3UG5 series can operate over a significantly wider frequency range – from 15 to 70 Hertz (Hz). This covers worldwide applications (e.g., 50 Hz in Europe and 60 Hz in the US). For unstable grids, it is also possible to specify the frequency to be monitored. This extends the range of possible applications. In addition, the devices can be used behind frequency converters. Railroad grids with frequencies of 16 2/3 Hz can now be monitored as well. The IO-Link open communication standard enables the transmission and evaluation of measured values and trends in the controller or in higher-level systems. IO-Link devices can be parameterized from a PC via the TIA portal. By saving the parameters, replaced devices are parameterized automatically.

The line of monitoring relays have functional safety certification in accordance with the SIL 1 (IEC 62061) and PL c (EN ISO 13849-1) standards and are suitable for use in a wide range of applications. Demand continues to rise for safety-certified components and systems that meet high quality and reliability requirements.