The Siemens 7UG0841-1CB20 is a digital Earth Leakage Relay (ELR) designed to provide reliable protection against earth leakage currents in single-phase and three-phase electrical systems. It is suitable for 1-Phase 2-Wire, 3-Phase 3-Wire, and 3-Phase 4-Wire networks, making it a versatile solution for industrial and commercial power distribution applications.
Operating with a 110V AC auxiliary supply, the relay continuously monitors leakage currents through an external Core Balance Current Transformer (CBCT) and helps detect insulation failures, earth faults, and leakage conditions before they cause equipment damage or safety hazards.
The relay is widely used in industrial plants, commercial buildings, motor control centers (MCCs), power distribution panels, process industries, utilities, and critical infrastructure, where personnel safety and equipment protection are essential.
With its compact 35 mm DIN rail-mounted design, the 7UG0841-1CB20 can be easily integrated into new or existing switchgear systems. The relay helps improve electrical safety, reduce downtime, and ensure compliance with modern protection requirements.
• Genuine Siemens Earth Leakage Relay
• Model: 7UG0841-1CB20
• Suitable for 1Ph-2W, 3Ph-3W & 3Ph-4W systems
• 110V AC auxiliary supply voltage
• Continuous earth leakage monitoring
• Works with external Core Balance Current Transformer (CBCT)
• Early detection of insulation faults and leakage currents
• Enhances personnel and equipment safety
• Compact 35 mm DIN rail mounting design
• Suitable for industrial and commercial applications
• High reliability and long operational life
| Parameter | Specification |
|---|---|
| Product Series | Siemens 7UG |
| Model Number | 7UG0841-1CB20 |
| Product Type | Earth Leakage Relay (ELR) |
| Auxiliary Supply Voltage | 110V AC |
| System Compatibility | 1Ph-2W, 3Ph-3W, 3Ph-4W |
| Monitoring Function | Earth Leakage Detection |
| Sensor Requirement | External CBCT (Core Balance CT) |
| Mounting Type | DIN Rail Mount |
| Module Width | 35 mm |
| Application | Earth Leakage & Personnel Protection |
| Usage | Industrial & Commercial Power Systems |
| Brand | Siemens |
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