Siemens Phase Sequence Monitoring Relay 3UG4511-1BP20 (SI-PSMR-500V)
₦108,451.20
The Siemens 3UG4511-1BP20 is a phase sequence monitoring relay for three-phase systems, rated 320–500 V.
Equipped with 2 CO (changeover) contacts and screw terminals, it ensures reliable detection of phase sequence and loss.
Ideal for motor protection, industrial panels, and automation systems requiring accurate phase monitoring.
The Siemens 3UG4511-1BP20 phase sequence monitoring relay is designed to protect three-phase motors and equipment from damage caused by incorrect phase sequence, phase loss, or phase imbalance. It operates reliably across a voltage range of 320–500 V, making it suitable for various industrial power distribution setups.
Featuring two changeover (CO) contacts and screw terminal connections, this relay allows easy integration into control circuits and provides both signaling and control functionality. The device continuously monitors the phase rotation and signals any deviations, helping to prevent mechanical and electrical faults in motors and connected equipment.
Its compact and durable design ensures compatibility with standard industrial enclosures and DIN rail mounting. With robust operation under industrial conditions, the 3UG4511-1BP20 supports long-term system reliability and reduces the risk of motor downtime.
Typical Applications
• Three-phase motor protection
• Industrial control panels
• Pump and compressor systems
• HVAC and ventilation systems
• Automation and machinery monitoring
| Manufacturer | Siemens |
|---|---|
| Model | 3UG4511-1BP20 |
| Weight | Approx. 0.25 kg |
| Rated Voltage | 3×320–500 V AC |
| Rated Current | Not Applicable (monitoring relay) |
| Rated Power | Not Applicable |
| Control Voltage | 320–500 V AC |
| Number of Poles | Not Applicable |
| Auxiliary Contacts | Not Applicable |
| Mounting Type | Panel / DIN Rail Mount |
| Frequency | 50/60 Hz |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
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