Siemens Analog monitoring relay, 1C/O, 24-240VAC/DC Part number 3UG4501-1AW30

Product Overview

The Siemens 3UG4501-1AW30 is an analog monitoring relay with a single change-over (1C/O) output contact and a wide supply voltage range of 24–240 V AC/DC. Designed for conductive and resistive level monitoring, it supports two- and three-electrode configurations, enabling reliable detection of minimum, maximum, or multi-level thresholds in tanks, vessels, and process systems. Its slim 22.5 mm housing, adjustable delay times, and galvanic isolation make it a robust and versatile solution for industrial automation environments.

Key Features

• Analog monitoring relay for conductive/resistive level measurement
• Wide supply voltage range: 24–240 V AC/DC
• 1 change-over output contact (1C/O)
• Supports two- and three-electrode level detection
• Adjustable delay time from 0.5–10 s for start-up or limit violation
• Measuring range 2 kΩ to 200 kΩ
• Slim 22.5 mm width for compact DIN-rail mounting
• Galvanic isolation between input and output
• High mechanical endurance (approx. 10 million operating cycles)

Technical Specifications

• Article Number: 3UG4501-1AW30
• Product Type: Analog monitoring relay
• Supply Voltage: 24–240 V AC/DC
• Output: 1 change-over contact (1C/O)
• Measuring Range: 2 kΩ…200 kΩ (conductive/resistive levels)
• Delay Time: Adjustable 0.5–10 s
• Electrical Ratings (AC-15): 3 A at 250/400 V
• Electrical Ratings (DC-13): 1 A at 24 V; 0.2 A at 125 V; 0.1 A at 250 V
• Insulation Voltage (Ui): 300 V (OVC III, PD 3)
• Connections: Screw terminals up to 4 mm² (solid) / 2.5 mm² (stranded)
• Dimensions (H × W × D): 92 × 22.5 × 91 mm
• Operating Temperature: –25 °C to +60 °C
• Protection: Galvanic isolation between sensor and output
• Mechanical Life: Approx. 10 million switching cycles

Compliance & Certifications

• Part of the Siemens SIRIUS 3UG4 monitoring relay family
• Designed to comply with industrial monitoring and control standards
• Suitable for overvoltage category III, pollution degree 3 environments

Applications

Suitable for level detection in conductive liquids, overflow and dry-run protection, pump control, tank monitoring, and process automation. Commonly used in water treatment systems, chemical and food processing plants, OEM machinery, and electrical control panels requiring precise analog level supervision.