Siemens SIRIUS Phase Failure and Sequence Monitoring Relay – 3UG4618-1CR20
The Siemens 3UG4618-1CR20 is a digital phase monitoring relay from the SIRIUS 3UG4 series designed for reliable monitoring of three-phase power systems with neutral conductor connection. It provides advanced protection against phase failure, incorrect phase sequence, voltage asymmetry, undervoltage, and overvoltage conditions, helping protect motors, compressors, pumps, HVAC systems, and industrial automation equipment from electrical faults and operational damage.
This compact DIN rail mounted relay features automatic phase sequence correction, adjustable hysteresis, configurable OFF delay time, and dual changeover relay outputs for dependable monitoring and fault signaling in industrial control systems. The device is suitable for use in switchboards, MCC panels, OEM machinery, and critical power monitoring applications.
Key Features:
• Digital three-phase monitoring relay
• Detects phase failure and phase sequence faults
• Automatic phase sequence correction
• Overvoltage and undervoltage monitoring
• Voltage asymmetry monitoring
• Adjustable hysteresis settings
• Adjustable OFF delay from 0–20 seconds
• 2 changeover relay contacts
• DIN rail mounting
• Screw terminal connections
• LED status indication
• Compact industrial housing
• Suitable for industrial automation and motor protection systems
|
Parameter |
Specification |
|
Product Model |
3UG4618-1CR20 |
|
Brand |
Siemens |
|
Product Series |
SIRIUS 3UG4 |
|
Product Type |
Digital Phase Monitoring Relay |
|
Monitoring Functions |
Phase Failure, Phase Sequence, Asymmetry,
Overvoltage, Undervoltage |
|
System Type |
3-Phase with Neutral Conductor |
|
Voltage Monitoring Range |
3 × 160–690 V AC |
|
Undervoltage / Overvoltage Range |
90–400 V AC |
|
Frequency Range |
50–60 Hz |
|
Hysteresis |
Adjustable 1–20 V |
|
OFF Delay Time |
Adjustable 0–20 s |
|
Asymmetry Monitoring |
0–20% |
|
Output Contacts |
2 Changeover Contacts (DPDT) |
|
Contact Rating |
250 V AC / 3 A |
|
Mounting Type |
DIN Rail Mounting |
|
Connection Type |
Screw Terminal |
|
Protection Class |
IP20 |
|
Dimensions |
22.5 × 102 × 91 mm |
|
Operating Temperature |
-20°C to +65°C |
|
Surge Voltage Resistance |
6 kV |
|
Voltage Type |
AC |
|
Mechanical Life |
10 Million Operations |
|
Standards |
CE, UL, IEC |
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