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Product Overview

Analog monitoring relay designed for phase sequence monitoring in three-phase power systems. This SIRIUS 3UG4 series monitoring relay provides reliable detection of phase sequence, phase failure, and phase asymmetry conditions in industrial applications. The device features a spring-type connection system for fast, maintenance-free, and vibration-proof installation, making it ideal for mobile systems and critical industrial equipment.

Key Features

• Phase sequence monitoring for three-phase systems
• Automatic detection of phase failure and phase asymmetry
• Self-supplied operation with wide voltage range capability
• Spring-type connection system for secure, maintenance-free installation
• Compact, slim design saves space in control cabinets
• Removable terminals for easy maintenance and replacement
• International certifications for worldwide use
• Vibration-proof connections suitable for mobile applications

Technical Specifications

• Article Number: 3UG4511-2AP20
• Monitoring Function: Phase sequence, phase failure, phase asymmetry
• Supply Voltage: 3 x 320...500 V AC
• Frequency Range: 50...60 Hz AC
• Contact Configuration: 1 change-over contact (SPDT)
• Contact Rating: 250 VAC / 3 A
• Connection Type: Spring-type connection system
• Gross Weight: 113.99 g
• EAN: 4011209642492
• Product Series: SIRIUS 3UG4

Applications & Use Cases

• Mobile systems monitoring (A/C compressors, refrigerated containers)
• Construction site equipment (compressors, cranes)
• Industrial motor protection systems
• Critical equipment monitoring requiring phase sequence verification
• Three-phase power system monitoring and control
• Switchgear and distribution panel integration

Design & Installation Benefits

• Slim design reduces space requirements in control cabinets
• Spring-type terminals eliminate screw loosening from vibration
• Removable terminal blocks allow pre-wiring and easy replacement
• Wide voltage range enables use in various international networks
• No auxiliary voltage required for operation
• Standardized accessories compatible across SIRIUS relay range

Monitoring Capabilities

• Phase Sequence Detection: Monitors correct L1-L2-L3 rotation
• Phase Failure Detection: Detects loss of any phase
• Phase Asymmetry Detection: Monitors for unbalanced phase conditions
• Automatic Response: Immediate switching upon fault detection
• Self-Monitoring: Continuous system health verification

Classification Data

• Product Series: SIRIUS 3UG4 Monitoring Relays
• Function Type: Line monitoring relay
• Installation Category: Control cabinet mounting
• Terminal Type: Spring-loaded connection

Download existing graphical data for this product:

• Product Datasheet - Technical specifications and connection diagrams
• Equipment Manual - SIRIUS 3UG4 Monitoring Relays - Comprehensive installation and operation guide
• SIRIUS 3UG4 Manual - Complete technical documentation
• SIRIUS Monitoring Relay Application Guide - Application examples and wiring diagrams
• Product Page - Siemens Industry Mall - Complete product information and ordering details