SIRIUS Insulation Monitoring Relay for Non-Grounded IT Networks and Electrical Safety – 3UG4581-1AW31

🔹 Siemens SIRIUS Insulation Monitoring Relay – 3UG4581-1AW31 (IT Networks Safety Relay)

🔹 Product Description

The Siemens 3UG4581-1AW31 is an insulation monitoring relay (IMR) from the Siemens SIRIUS 3UG4 series, designed for electrical safety in non-grounded (IT) power distribution systems. It continuously monitors the insulation resistance of unearthed networks and alerts or trips when insulation faults occur.

This relay is widely used in critical power systems such as hospitals, shipbuilding, railway systems, chemical plants, and emergency power supplies, where uninterrupted operation is essential and early fault detection is required.

It works by measuring the insulation resistance between live conductors and earth, ensuring early detection of leakage or ground faults before they become hazardous. The device provides fast response, self-monitoring, and adjustable threshold settings, making it highly reliable for industrial safety applications.

🔹 Key Features

• Genuine Siemens SIRIUS 3UG4 insulation monitoring relay
• Model: 3UG4581-1AW31
• Designed for IT (ungrounded) electrical networks
• Monitors insulation resistance continuously
• Adjustable measuring range (approx. 1–100 kΩ)
• Wide control supply voltage (AC/DC 24–240 V)
• Fast fault detection with alarm/trip output
• DIN rail mounting (compact 22.5 mm design)
• Suitable for critical infrastructure and industrial safety systems
• Self-monitoring and manual test/reset function