Siemens Analog monitoring relay, screw, 2 c/o contact Part number 3UG5514-1BR20

Product Overview

The Siemens 3UG5514-1BR20 is an analog three-phase monitoring relay from the SIRIUS 3UG5 series. It is designed to continuously monitor phase sequence, phase failure, phase asymmetry and undervoltage in three-phase AC systems. With screw terminals and two change-over (2 C/O) contacts, it provides reliable signalling and control for industrial automation and motor protection applications where stable and correct supply conditions are essential.

Key Features

• Three-phase analog monitoring relay for voltage and phase supervision
• Monitors phase sequence, phase failure, phase asymmetry and undervoltage
• Two change-over contacts (2 C/O) for signalling and control outputs
• Screw terminal connection for secure wiring
• Wide monitoring voltage range: 160 V…760 V AC
• Adjustable response delay for stable fault detection
• LED status indication for supply and fault monitoring
• Compact housing for 35 mm DIN-rail mounting

Technical Specifications

• Article Number: 3UG5514-1BR20
• Product Family: SIRIUS 3UG5 Monitoring Relays
• Monitoring Function: Phase sequence, phase failure, phase asymmetry, undervoltage
• Monitoring Voltage Range: 160…760 V AC (3-phase)
• Control Supply Voltage: 200…690 V AC, 50/60 Hz
• Output Contacts: 2 × change-over (2 C/O)
• Switching Capacity (AC-15): 3 A at 230/400 V AC
• Response Delay: Adjustable (typ. 0.1…20 s)
• Connection Type: Screw terminals
• Mounting: 35 mm DIN rail
• Housing Width: approx. 22.5 mm
• Degree of Protection: IP20
• Operating Temperature: –25 °C … +60 °C

Compliance & Certifications

• Manufactured according to Siemens SIRIUS industrial standards
• Complies with IEC/EN standards for monitoring relays
• Suitable for industrial control panels and automation environments

Applications

This analog monitoring relay is used in motor control panels, switchgear and industrial automation systems where continuous monitoring of three-phase voltage conditions is required. It helps protect motors and equipment against damage caused by phase failure, incorrect phase sequence and voltage imbalance, making it ideal for conveyors, pumps, compressors and other critical three-phase applications.