Phase sequence relay for three-phase lines
The Siemens 3UG5511-1AR20 is a monitoring relay that checks phase sequence on three-phase supplies from 160 to 690 V AC, 15-70 Hz. It uses a single changeover contact and screw terminals for panel wiring. Part of the Line monitoring family, this relay sits in the Process / Temperature Controllers category but its job is pure power-quality supervision — it watches the order the phases arrive, not the temperature.
Active production and compliance
RoHS compliant since 01-06-23. Export control classification is AL:N / ECCN:N.
Panel fit and packaging
Packaged as a single piece with dimensions 126 x 110 x 36 mm — fits a standard DIN-rail footprint alongside other monitoring relays. Screw terminals mean no special tooling for termination.