The Siemens 7UG0818-1CA20 is a digital line monitoring relay designed for comprehensive monitoring and protection of 3-phase electrical systems. This self-powered relay continuously supervises voltage conditions and critical network parameters, helping protect motors, equipment, and power distribution systems from abnormal supply conditions.
Suitable for both 3-phase 3-wire and 3-phase 4-wire networks, the relay provides reliable detection of overvoltage, undervoltage, phase failure, phase reversal, and phase imbalance conditions. By identifying electrical faults at an early stage, it helps prevent equipment damage, unplanned downtime, and costly maintenance.
The relay operates directly from the monitored voltage, eliminating the need for an external auxiliary power supply. Its compact 35 mm DIN rail-mounted design makes it ideal for installation in motor control centers (MCCs), power distribution panels, industrial automation systems, process plants, and commercial facilities.
Designed as part of the Siemens 7UG monitoring relay series, the 7UG0818-1CA20 delivers accurate monitoring, dependable fault detection, and long-term operational reliability in demanding industrial environments.
• Genuine Siemens digital line monitoring relay
• Model: 7UG0818-1CA20
• Self-powered operation without auxiliary supply
• Suitable for 3-phase 3-wire and 3-phase 4-wire systems
• Overvoltage and undervoltage monitoring
• Phase failure detection
• Phase sequence (phase reversal) monitoring
• Phase imbalance monitoring capability
• Compact 35 mm DIN rail mounting design
• Reliable protection for motors and electrical equipment
• High operational reliability and long service life
| Parameter | Specification |
|---|---|
| Product Series | Siemens 7UG |
| Model Number | 7UG0818-1CA20 |
| Product Type | Digital Line Monitoring Relay |
| System Compatibility | 3-Phase 3-Wire / 3-Phase 4-Wire |
| Supply Type | Self-Powered |
| Operating Voltage (L-L) | 280–500 V AC |
| Operating Voltage (L-N) | 160–300 V AC |
| Protection Functions | Overvoltage, Undervoltage, Phase Failure, Phase Reversal, Phase Imbalance |
| Output Contacts | 2 Changeover Contacts |
| Mounting Type | DIN Rail Mount |
| Module Width | 35 mm |
| Frequency | 50/60 Hz |
| Application | Power Distribution & Motor Protection |
| Brand | Siemens |
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