3UG4617-1CR20

The Siemens SIRIUS 3UG4617-1CR20 three-phase power supply voltage monitoring relay features automatic phase sequence correction, phase loss detection, and over/under voltage monitoring. It has a voltage range of 3x160 to 690V AC and is certified by multiple countries including UL and CCC.

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Siemens SIRIUS 3UG4617-1CR20 Three-Phase Voltage Monitoring Station Product Image

Product Positioning

The 3UG4617-1CR20 is a Siemens SIRIUS three-phase power supply voltage monitoring relay with built-in automatic phase sequence correction function, which can detect abnormal conditions such as phase loss, overvoltage and undervoltage in real time.

Core Product Advantages and Features

Automatic phase sequence correction

When a phase sequence error is detected, the phase sequence can be automatically corrected to ensure the motor rotates in the correct direction.

Dual-point division of labor design

Two sets of delayed switching CO contacts correspond to phase sequence correction and line fault output, respectively, which facilitates separate wiring control.

Over/under voltage and asymmetry monitoring

The asymmetry detection threshold can be adjusted from 0 to 20%, and overvoltage and undervoltage can be monitored simultaneously.

Multiple international certifications and tolerance to harsh environments

It has obtained UL, EAC, RCM, CCC and ship classification certifications and can operate stably in environments ranging from -25°C to +60°C.

project	Specification
Model (MLFB)	3UG4617-1CR20
Monitoring function	Automatic phase sequence correction, phase loss, over/under voltage, and asymmetry (0~20%).
Voltage measurement range	3x160~690V AC, 50/60Hz
Output contacts	Two sets of delayed switching CO contacts (one for phase sequence correction and one for line fault).
Contact Rating	AC-15 3A/250V, 400V
Hysteresis	1~20V adjustable
Action delay time	Adjustable from 0.1 to 20 seconds
Installation dimensions	22.5 x 92 x 91 mm, weighing approximately 0.148 kg
Operating temperature	-25°C to +60°C, altitude below 2000m
Certification	UL, EAC, RCM, CCC, ship classification (LR, DNV-GL), rail transportation

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3UG4616-1CR20

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