Siemens 7UG0818-1CA20 Line Monitoring Relay

Siemens 7UG0818-1CA20 Line Monitoring Relay

The Siemens 7UG0818-1CA20 is a self-powered, 3-phase line monitoring relay designed to protect electrical systems from faults such as phase failure, phase sequence error, imbalance, under/over-voltage, and frequency deviations. It supports both 3-wire and 4-wire systems, operates within 280–520 V AC (L-L) and 160–288 V AC (L-N), and features DIN-rail mounting with IP20 protection. Ideal for industrial panels, motors, and automation systems, it ensures reliable supply monitoring and equipment safety.