Siemens SIRIUS 3UG5512-2BR20 Phase Monitoring Relay, 3-Phase, 160-690V AC, 2CO Contacts

The Siemens SIRIUS 3UG5512-2BR20 is a high-performance phase monitoring relay engineered to provide comprehensive protection for 3-phase electrical networks. It is specifically designed to detect critical power issues such as phase failure, incorrect phase sequence, and phase asymmetry, ensuring that industrial equipment remains safe from damage caused by unstable power supply conditions. This relay is built for reliability and versatility, making it an essential component for maintaining operational continuity in demanding industrial environments.

Advantages

This monitoring relay offers significant benefits, including a wide operating voltage range that allows for global application without the need for auxiliary power. Its slim design helps optimize space within control cabinets, while the integrated spring-loaded terminals ensure a fast, vibration-proof, and maintenance-free connection. The device is built to replace the proven 3UG4 series, offering improved performance and standardized accessories for easier installation and maintenance.

Suitable for

• Monitoring phase sequence and failure in mobile systems like A/C compressors
• Refrigerated containers and transport cooling units
• Construction site compressors and heavy-duty cranes
• Photovoltaic systems and wind turbine power management

When it may not be suitable

This device is intended for 3-phase AC networks and is not suitable for single-phase applications or DC power monitoring. It should not be used in environments that exceed the specified voltage or frequency ranges, as this may lead to inaccurate monitoring or device failure.

Key specifications

• Voltage range: 160-690V AC
• Frequency range: 15-70 Hz
• Contacts: 2 changeover (2CO) contacts
• Connection type: Spring-loaded terminals
• Functionality: Phase failure, phase sequence, and asymmetry monitoring

How to use

The relay should be installed by a qualified professional within a control cabinet. Connect the 3-phase supply lines to the designated terminals. The spring-loaded connection system allows for quick wire insertion without the need for constant retightening. Once installed, the device automatically monitors the network parameters. Ensure that the wiring is secure and that the device is protected from environmental factors like excessive moisture or dust, as per standard industrial installation practices.

What to consider before purchase

• Verify that your network voltage falls within the 160-690V AC range
• Ensure the application requires 3-phase monitoring
• Confirm that the spring-loaded terminal type is compatible with your existing wiring standards
• Check if your specific safety requirements necessitate SIL 1/PL c certified versions

Usage recommendations

For optimal performance and longevity, ensure the relay is mounted in a clean, dry environment within a control cabinet. Regularly inspect the spring-loaded connections during routine maintenance to ensure they remain secure, especially in high-vibration applications.