3UG4618-1CR20

The Siemens SIRIUS 3UG4618-1CR20 is a three-phase voltage monitoring relay that supports neutral connection and features automatic phase sequence correction. It has a voltage range of 3x160 to 690V AC (90 to 400V for neutral) and dual CO delayed output contacts.

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Siemens SIRIUS 3UG4618-1CR20 Three-Phase Voltage Phase Sequence Monitoring Transmitter Product Image

Product Positioning

The 3UG4618-1CR20 is a Siemens SIRIUS series three-phase voltage monitoring relay that supports neutral (N) connection and has a built-in automatic phase sequence correction function. It can simultaneously monitor abnormalities such as phase loss, asymmetry, and over/under voltage.

Core Product Advantages and Features

Automatic phase sequence correction function

When a phase sequence error is detected, it can be automatically corrected, eliminating the need for manual rewiring and reducing the risk of motor reversal.

Supports neutral (N) connection method

It can measure the voltage from 90 to 400V relative to the neutral line and is suitable for three-phase four-wire power supply systems with a neutral line.

Asymmetric and Over/Under Voltage Monitoring

It provides adjustable asymmetry detection from 0 to 20%, and allows setting overvoltage and undervoltage action thresholds.

Dual-set delay conversion contacts

Equipped with two sets of delayed switching CO contacts, AC-15 rated at 3A/250V and 400V, it is convenient for connecting alarm circuits in series.

project	Specification
Model (MLFB)	3UG4618-1CR20
Monitoring function	Automatic phase sequence correction, phase loss, asymmetry (0~20%), over/under voltage.
Voltage measurement range	3x160~690V AC (90~400V relative to neutral line N), 50/60Hz
Output contacts	Two sets of delay switching conversion contacts (CO)
Contact Rating	AC-15 3A/250V, 400V; DC-13 1A/24V
Hysteresis	1~20V adjustable
Action delay time	Adjustable from 0.1 to 20 seconds
Installation dimensions	22.5 x 102 x 91 mm
Terminal type	Screw terminals
Protection level	IP20 rating, mechanical life approximately 10 million cycles.
Certification	UL, EAC, RCM, CE

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