The Siemens 3UG4511-1AP20 is a phase sequence and phase monitoring relay from the SIRIUS 3UG4 series. It is designed to protect 3-phase systems by detecting incorrect phase sequence (R-Y-B order) and ensuring the motor or equipment does not run in reverse direction.
This device is commonly used in motors, pumps, compressors, and industrial machinery to prevent damage due to wrong phase connection or phase failure.
• Siemens SIRIUS 3UG4 monitoring relay
• Model: 3UG4511-1AP20
• Function: Phase sequence monitoring + phase failure detection
• Suitable for 3-phase AC systems (320V – 500V AC)
• DIN rail mounting design
• 1 changeover contact (SPDT output)
• Output rating: 250V AC / 3A
• Compact width: 22.5 mm modular design
• LED status indication for power and fault
• Screw terminal connection
• High reliability industrial protection device
• Fast response to incorrect phase sequence
• Maintenance-free operation
• Used for motor safety and rotation protection
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3UG4 |
| Model Number | 3UG4511-1AP20 |
| Product Type | Phase Monitoring Relay |
| Function | Phase sequence + phase failure detection |
| Supply Voltage | 3 × 320…500 V AC |
| Frequency | 50/60 Hz |
| Output Contact | 1 × SPDT (Changeover contact) |
| Output Rating | 250 V AC / 3 A |
| Mounting Type | DIN Rail |
| Connection Type | Screw terminals |
| Width | 22.5 mm |
| Operating Temp | -20°C to +65°C |
| Protection Class | IP20 |
| Brand | Siemens |
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