Siemens Sirius Line monitoring relay, phase monitoring, 6kV, 690V Part number 3UG5512-1AR20

Product Overview

The Siemens 3UG5512-1AR20 is a three-phase line-monitoring relay from the SIRIUS 3UG5 series, designed to monitor phase sequence, phase failure and phase asymmetry in AC networks ranging from 160 V to 760 V. It features a single change-over (1 C/O) contact and screw-type terminals, making it ideal for compact control cabinets and automation environments where monitoring of supply integrity is critical.

Key Features

• Phase monitoring relay for three-phase systems (phase sequence, phase failure, phase asymmetry)
• Voltage sensing range: 160 … 760 V AC (three-phase)
• Control supply voltage: 200 … 690 V AC at 50/60 Hz
• Screw-type terminals for secure wiring
• One change-over (1 C/O) contact output
• Compact width: 22.5 mm — ideal for space-saving DIN-rail installations
• Auto-reset feature for automatic recovery after fault clearance

Technical Specifications

• Article Number: 3UG5512-1AR20
• Product Family: SIRIUS 3UG5 line-monitoring relays
• Sensing Voltage Range: 160 … 760 V AC (three-phase)
• Control Supply Voltage (AC): 200 … 690 V AC, 50/60 Hz
• Output Contact Configuration: 1 × change-over (C/O)
• Mounting Width: 22.5 mm
• Operating Ambient Temperature: –25°C … +60°C
• Protection Rating (Front): IP20
• Terminal Connection: Screw-type, conductor cross-section up to 4 mm² solid or stranded with ferrules

Compliance & Certifications

• Designed according to Siemens industrial automation standards for monitoring relays
• Suitable for DIN-rail mounting in control panels and industrial switchgear

Applications

The 3UG5512-1AR20 is ideal for monitoring the supply integrity of three-phase motors, pumps, compressors and automation systems. It helps detect phase sequence errors, phase loss and voltage imbalance, enabling uptime protection and preventing damage to connected equipment. This makes it suitable for machine-tool control cabinets, industrial plants and distributed automation installations.