🔹 Earth Fault Monitoring Relay, 85–270V AC/DC Auxiliary Supply, 2 C/O Contacts, 35mm Module – 7UG0861-1BU20

🔹 Product Description

The Siemens 7UG0861-1BU20 is a digital earth fault monitoring relay designed to provide reliable detection of earth leakage and ground fault conditions in industrial and commercial electrical systems. It continuously monitors residual current through an external Core Balance Current Transformer (CBCT) and helps prevent equipment damage, electrical hazards, and unplanned downtime caused by insulation failures or earth faults.

Operating with a wide 85–270V AC/DC auxiliary supply, this relay offers excellent flexibility for various power distribution and control applications. It is suitable for use in industrial plants, commercial buildings, motor control centers (MCCs), power distribution panels, process industries, utilities, and infrastructure projects where continuous earth fault monitoring is essential.

The relay features 2 Changeover (2 C/O) output contacts, enabling alarm signaling, fault indication, or tripping functions within protection and automation systems. Its compact 35 mm DIN rail-mounted design allows easy installation in switchgear and control panels while conserving panel space.

As part of the Siemens 7UG monitoring relay series, the 7UG0861-1BU20 provides accurate fault detection, dependable operation, and long-term reliability for modern electrical protection systems.

🔹 Key Features

• Genuine Siemens Earth Fault Monitoring Relay
• Model: 7UG0861-1BU20
• Wide auxiliary supply voltage: 85–270V AC/DC
• Continuous earth fault and leakage current monitoring
• Compatible with external CBCT sensors
• 2 Changeover (2 C/O) output contacts
• Early detection of insulation failures and ground faults
• Enhances personnel and equipment protection
• Compact 35 mm DIN rail mounting design
• Suitable for industrial and commercial power systems
• High reliability and long operational life