Siemens 3UG5514-1BR20 Analog Monitoring Relay for Phase Failure, Phase Sequence, Asymmetry, Undervoltage, Overvoltage, 160-690 V AC, 2 CO Contacts, DIN Rail Mount

The Siemens 3UG5514-1BR20 is a high-quality analog monitoring relay designed for reliable three-phase network monitoring. It detects phase failure, phase sequence errors, asymmetry, undervoltage, and overvoltage conditions, ensuring the protection of your electrical equipment. With a wide operating voltage range of 160-690 V AC and adjustable thresholds, this relay offers flexibility for various industrial applications. Its true RMS measurement principle provides accurate readings even in distorted networks.

Advantages

This monitoring relay offers comprehensive protection with five monitoring functions in one device. The adjustable ON-delay and OFF-delay times (0.1-20 s) allow for precise coordination with your system. The 2 change-over contacts (2 CO) provide versatile switching capabilities. DIN rail mounting simplifies installation in control cabinets.

Suitable for

• Industrial motor protection
• Generator monitoring
• Power supply monitoring
• Automation systems
• HVAC equipment

Key specifications

• Product Type: Monitoring Relay
• Monitoring Functions: Phase failure, Phase sequence, Asymmetry, Undervoltage, Overvoltage
• Operating Voltage: 160-690 V AC
• Frequency: 50/60 Hz
• Output Contacts: 2 change-over contacts (2 CO)
• Terminal Type: Screw terminals
• Mounting: DIN rail (35 mm)
• Adjustable Undervoltage Threshold: 160-690 V
• Adjustable Overvoltage Threshold: 160-690 V
• Adjustable Asymmetry Threshold: 5-20%
• Adjustable ON-delay Time: 0.1-20 s
• Adjustable OFF-delay Time: 0.1-20 s
• Measuring Principle: True RMS
• Operating Temperature: -25 to +60 °C
• Protection Class (Housing): IP40
• Protection Class (Terminals): IP20
• Electrical Service Life: 100,000 switching cycles at rated load

Recommendations

For optimal performance, ensure the relay is installed in a clean, dry environment within the specified temperature range. Use appropriate screw terminals with recommended wire sizes. Regularly test the relay functions to maintain system reliability.